Agathidium hatchi Wheeler, 1977

MILLER, KELLY B. & WHEELER, QUENTIN D., 2005, Slime-Mold Beetles Of The Genus Agathidium Panzer In North And Central America, Part Ii. Coleoptera: Leiodidae, Bulletin of the American Museum of Natural History 2005 (291), pp. 1-167 : 19-23

Agathidium hatchi Wheeler Figures 4 , 37, 38 , 43

Anisotoma fenderi Hatch, 1957: 32 .

Agathidium hatchi Wheeler, 1977: 137 (new combination, replacement name for Agathidium fenderi ( Hatch, 1957, Anisotoma ), preoccupied by Agathidium fenderi Hatch, 1957 ).

TYPE MATERIAL: Holotype, ♀ in OSAC, examined by the second author ( Wheeler, 1977).

TYPE LOCALITY: United States, Oregon, Ocean Park.

DIAGNOSIS: This species differs from others by its very large size (TBL> 3.5 mm), clavate antennae (antennomeres 5–11 gradually widening) (fig. 4), unmodified male metafemur (without teeth) and very distinctive median lobe which is long, slender, irregularly sinuate, and has the apex bifid in ventral aspect (figs. 37, 38).

DESCRIPTION: Body very large (TBL = 3.77–4.14 mm), broad (PNW/TBL = 0.53– 0.55), laterally broadly rounded, somewhat contractile.

Head, pronotum, and elytra red­brown; venter red­brown, darker on metasternum; antennae brown, club dark brown; palpi brown; legs yellow­brown.

Head broad (fig. 4) (MDL/OHW = 0.66– 0.67), flattened, without transverse, medial crease; temporum very prominent, about length of eye when viewed in dorsal aspect, extending laterad beyond level of eye at posterior end (fig. 4); head finely and densely punctate, surface between punctures with conspicuous microreticulation of small cells; eyes large, rounded, finely faceted; frontoclypeal suture prominent through entire length; clypeal margin relatively straight, extending to level of anterolateral margins of frons (fig. 4); anterior margin of labrum entire; antenna clavate, club not abrupt (fig. 4), antennomere ratios: length I:II:III = 1.8:1.0:1.6, width VII:VIII:IX = 1.0:1.0:1.2. Pronotum broad (PNL/PNW = 0.43–0.48), laterally not strongly produced, anterolateral angle moderately rounded, posterolateral angle more angulate than anterolateral angle; punctation and surface microsculpture similar to that of head. Elytra broad, robust, laterally broadly rounded (SEL/ELW = 1.08–1.19); coarsely and densely punctate, punctures not in series, surface between punctures shiny and smooth; sutural stria about two­thirds length of elytron. Mesosternum slightly concave posteriorly, without prominent lobe extending ventrally between mesocoxae, anterior portion about one­half length of posterior portion; medial longitudinal carina absent on anterior portion. Metasternum broad medially (MTL/ MTW = 0.30–0.31), slightly convex, setose; oblique carinae absent.

Male tarsi 5­5­4; pro­ and mesobasotarsomeres moderately expanded and with large ventral field of spatulate setae; left mandible unmodified; metafemur slender, unmodified; metasternal fovea moderately large, transverse, linear, anterad of middle, with prominent series of fine, dense setae. Median lobe in lateral aspect long, slender, irregularly sinuate, with distinct prominence on dorsal surface at base of apical portion which is robust, slightly curved and apically pointed (fig. 38); in ventral aspect very slender, lateral margins subparallel, apically prominently divided into two robust, apically pointed rami, apical orifice elongate (fig. 37); operculum absent (fig. 37); lateral lobes broad, broadly fused along dorsal and ventral margins forming a sheath around median lobe, apical portions broad, tapered to rounded apices, ending far short of apex of median lobe, without apical setae (figs. 37, 38).

Female tarsi 5­4­4.

DISTRIBUTION: This species is known from Oregon and New Brunswick (fig. 43).

SPECIMENS EXAMINED: CANADA: New Brunswick: Fredrickton, 20 Mar 1961, RC Clark (1, Utah State).

UNITED STATES: Oregon: 5 MI NE Newberg, 2 Nov 1968, black light trap, Anderson and Goeden (1, Utah State).

DISCUSSION: This species was first described in Anisotoma but was transferred to Agathidium by Wheeler (1977). Hatch (1957) had already described a species of Agathidium named fenderi , and thus Wheeler replaced the transferred homonymous name with A. hatchi . Superficially the species does resemble many members of Anisotoma in being exceptionally large, broad, and dorsoventrally flattened. The unusual male genitalia are also reminiscent of some members of Anisotoma and are quite different from most other North American Agathidium . However, the prolonged temporum and supraocular carina (fig. 4), anteriorly shortened clypeus (fig. 4), and lack of serial striae on the elytra together suggest the species best belongs in Agathidium following Wheeler (1977). The antennae are unusual in that antennomeres 5– 8 are gradually broadened such that the antenna does not have an abrupt 3­segmented club (fig. 4). In other respects, the species seems to resemble A. concinnum in general shape, relatively shallow concavity of the posterior portion of the mesosternum, and prolonged and protruding temporum.

The distribution of this species is unusual in that specimens are known from Oregon and New Brunswick, but from nowhere in between. The Oregon specimens (including the type) are females and the New Brunswick specimen is a male. Therefore, there is some possibility the specimens represent different species and that our male­female association is incorrect. However, since the specimens agree closely in all characters examined and numerous other species have transcontinental distributions, we regard conspecificity of the specimens to be a reasonable hypothesis until additional material can be discovered. It is also possible that the New Brunswick specimen is mislabeled. The species has been collected in March and November. One specimen was collected in a black light trap.

Agathidium concinnum Mannerheim Figures 2 , 5 , 39, 40 , 43 , 118

Agathidium concinnum Mannerheim, 1852: 370 ; Horn, 1880; Leng, 1020; Fall, 1934b; Hatch, 1957.

Agathidium castaneum: Attributed to ‘‘Ménétriés in litteris’’ by Mannerheim (1852). (Published in synonymy with A. concinnum and never

made available by subsequent use as a valid

name.) NOMEN NUDUM.

Agathidium effluens Mannerheim, 1853: 202 ;

Horn, 1880 (synonymized with A. concinnum );

Leng, 1920.

TYPE MATERIAL: Agathidium concinnum : lectotype (designated here to clarify assignment of this name to this species), ♀ in MCZC labeled ‘‘46/Type 7944 [number handwritten, red label]/ A. concinnum Sitkha Mannh. [handwritten]’’. Mannerheim had multiple individuals of this species, but was not clear how many. We have selected the female in MCZC labeled as the type as the lectotype.

Agathidium effluens : lectotype (designated here to clarify assignment of this name to this species), ♀ in MCZC labeled ‘‘Kenai [handwritten]/ A.effluens RA. Mann [handwritten]/concinnum8 [handwritten]’’. Mannerheim was not clear whether multiple specimens were involved during this description, so we have selected a single specimen from the MCZC as the lectotype.

TYPE LOCALITY: Agathidium concinnum : United States, Alaska. Agathidium effluens : United States, Alaska, Kenai Peninsula.

DIAGNOSIS: This species is characterized by the laterally protruding temporum in a bulge beyond the lateral margin of the eye (figs. 2, 5), the broad, depressed body form, the metafemur with a small, medial tooth on the posterior margin in most male specimens (fig. 118), and the median lobe of the aedeagus in lateral aspect very robust, with broad basal portion and subbasal constriction, apically tapered to a sharp, curved point (fig. 40) and in ventral aspect broad, with the apical portion broadly triangular and sharply pointed (fig. 39). The apical orifice is large with prominent, truncate rami visible (fig. 39).

DESCRIPTION: Body large (TBL = 2.51– 3.30 mm), broad (PNW/TBL = 0.48–0.49), laterally broadly rounded, moderately contractile.

Head pronotum and elytron light brown to dark red­brown; venter light brown, darker on metasternum; antennae brown, club dark brown; palpi and legs brown.

Head broad (figs. 2, 5) (MDL/OHW = 0.60 –0.67), flattened, without transverse, medial crease; temporum very prominent, about one­half length of eye when viewed in dorsal aspect, extending prominently lateral to eye (figs. 2, 5); head finely and moderately densely punctate, smooth and shiny on surface between punctures; eyes large, rounded, finely faceted; frontoclypeal suture obsolete medially; clypeal margin curved, extending slightly beyond anterolateral margins of frons (figs. 2, 5); anterior margin of labrum entire; antennomere ratios: length I:II:III = 2.4:1.0:2.1, width VII:VIII:IX = 1.0:1.0:2.0. Pronotum broad (PNL/PNW = 0.49–0.50), not strongly produced laterally, anterolateral angle subquadrate, posterolateral angle moderately angulate; punctation and surface microsculpture similar to those of head. Elytra broad, laterally broadly rounded (SEL/ELW = 1.02–1.11); coarsely and densely punctate, punctures not in series, surface between punctures shiny and smooth; sutural stria about one­half length of elytron on most specimens. Mesosternum moderately and broadly concave posteriorly, without prominent lobe extending ventrally between mesocoxae, anterior portion about one­half length of posterior portion; medial longitudinal carina absent on anterior portion. Metasternum relatively broad medially (MTL/ MTW = 0.24–0.29), slightly convex, setose; oblique carinae absent.

Male tarsi 5­5­4; pro­ and mesobasotarsomeres slightly expanded and with small ventral field of spatulate setae; left mandible unmodified; metafemur slender, many specimens with distinct, medial, small tooth (fig. 118); metasternal fovea minute, medial with small brush of fine, dense setae. Median lobe in lateral aspect very robust, very broad basally with prominent subbasal constriction, medially curved and expanded, apically tapered to sharply pointed, slightly dorsally directed apex (fig. 40); in ventral aspect broad, apical portion very broadly triangular, tapered to slightly acuminate, pointed apex, orifice extremely large (fig. 39); operculum comprised of two long, broad, flat structures, each ramus apically rounded to subtruncate (fig. 39); lateral lobes moderately broad basally, more slender submedially, apically expanded and directed ventrad, apices slightly constricted and pointed with 2 prominent setae (figs. 39, 40).

Female tarsi 5­4­4.

DISTRIBUTION: This species is widespread in western North America from Alaska south to Arizona and east to Colorado and New Mexico (fig. 43).

SPECIMENS EXAMINED: ‘‘W.T.’’ [probably Washington Territory] (1, MCZC).

CANADA: British Columbia: NEAR Mabel Lake at Squaw Valley , 11 Aug 1982, R Baranowski (2, LUND) ; Mesachie , 30 Jun 1980, H and A Howden (8, CNCI) ; Stanley , 21 Jun 1932, W Mathers (1, CASC) ; Pender harbor, 20 Jun 1929, RT Turner (1, CASC) ; Lorna , 29 Jul 1926, H Richmond (4, CASC) ; Merrit , 22 Aug 1925, Pinus ponderosa, WM Mathers (1, MCZC) ; Lorna , 28 Jul 1926, Picea engelmanni, H Richmond (1, MCZC) ; Lorna , 20 Jul 1924, R Hopping (2, MCZC) ; Lorna , 23 Jul 1924, R Hopping (2, MCZC) ; Lorna , 28 Jul 1926, Picea engelmanni, B Hopping (1, CASC) ; Monashee Mtn Near Cherryville , 11 Aug 1982, 1600 m, M Sorensson (4, LUND) ; Stanley (1, CASC) ; Terrace , ME Hippisley (1, MCZC) ; Terrace (1, MCZC) ; Terrace , Feb 1960, ME Clark (1, MCZC) ; Terrace , ME Clark (1, MCZC) ; near Mabel Lake at Squaw Valley , 5 Aug 1982, R Baranowski (2, LUND) ; Monashee Mtn Near Cherryville , 10 Aug 1982, 1400–1600 m, M Sorenson (3, LUND) ; Manning Park, E gate, 24 Jul 1984, lodgepole pine, D Miller (1, CNCI) ; Manning Prov. Park, 27 Nov 1992, 1220 m, spruce or fir log, red or brown rotten wood, R Baranowski (1, LUND) .

UNITED STATES: Alaska: E Fork Toklat Riv­ er, McKinley Park , 17 Aug 1958, Lindroth (1, MCZC). Arizona: state only (5, MCZC) ; White Mts , 4 Jul 1933 (2, CASC) ; Flagstaff, San Francisco Mts , 13 Aug 1934, 8000̍, D Rockefeller (2, AMNH). California: state only (14, MCZC) ; Miami, Jun (1, MCZC) ; Sta Cruz Mts (1, CASC) ; Tehachapi, Wickham (1, MCZC) ; colr. (2, MCZC); Stanford Univ , 4 Apr 1955, PS Bartholomew (2, CASC) ; Tahoe Canyon, 27 Jun, A Fenyes (2, MCZC) ; Miami, Jun (1, CASC) ; Pomona , 30 May 1896 (1, MCZC) ; Yosemite , 20 May 1934, Bryant (1, CASC) ; McClaw, A Fenyes (1, CMNH) ; Los Gatos (1, MCZC) ; Tehachapi, Wickham (1, MCZC) ; North Fork , 31 May 1920, Dietrich (2, MCZC) ; Tahoe Canyon, Jun (1, CASC) ; Manzanita Lake, Lassen Natl Park , 23 May 1941, CD Michener (1, EMEC) ; Wawona, Jun (1, CASC) ; Sugar Pine, 6 Jul (1, CASC) ; Miami, Jun (1, CASC) ; Alpine Co.: 4 mi W Markleville , 30 Sep 1970, grass duff, Berlese, FG Andrews (1, FGAC) ; Butte Co.: 5 mi NE Butte Mdw Cherry Hill Cpgd , 7 May 1976, caught flying, FG Andrews (2, FGAC) ; El Dorado Co.: 0.7 mi E Pacific House , 28 Apr 1992, screening flume, F Andrews, T Eichlin (1, FGAC) ; 7 mi S Yellow­ jacket Camp , 28 Jun 1980, CY Kitayama (4, EMEC) ; China Flat CG, 2 mi S Kyburz, 21 Jun 1979, 4300̍, W and AR Hardy (1, FGAC) ; 5 mi S Meyers , 29 Jun 1975, 7200̍, mixed conifer forest, litter, Berlese, A. Newton, M. Thayer (1, MCZC) ; Fresno Co.: 5 mi SW Big Creek , 9 Jul 1962, JF Lawrence (2, MCZC) ; Kern Co.: 2 mi W Woffard Hts , 29 Apr 1964, Doyen (1, EMEC) ; Mariposa Co.: Fish Camp , 6 mi NW, 8 Jul 1962, JF Lawrence (1, EMEC) ; 2 mi NE Darrah , 17 Nov 1975, oak litter, Berlese, AJ Gilbert (1, FGAC) ; Mono Co.: Convict Lake (near Mammoth Lakes ), 13 Jun 1984, 8000̍, R Baranowski (1, LUND) ; Inyo Hat For. HM Hall Nat Area , 28 Aug 1973, 10,000 –10,400 ̍, Pinus murrayana forest, pitfall trap, R Papp (3, EMEC) ; Nevada Co.: Sagehen Creek , 28 Aug 1983, debris, log in stream, F Andrews, A Hardy (1, FGAC) ; Placer Co.: Carnelian Bay, Lake Tahoe , 24 Jun 1964, DF Veirs (1, EMEC) ; Plumas Co.: Lake Almanor , 23 Apr 1971, pine litter, FG Andrews (1, FGAC) ; San Bernardino Co.: Hardin Flats , 13 Jun 1964, R Scott (1, FGAC) ; Santa Clara Co.: colr. (1, MCZC) ; Santa Cruz Co.: county only (1, MCZC) ; Boulder Creek , 7 May 1968, A and A Gillogly (1, FGAC) ; Shasta Co.: Burney Falls , 18 Jun 1954, RO Schuster (2, FGAC) ; Sierra Co.: Yuba Pass , 8 Jul 1976, moss along small stream, FG Andrews (1, FGAC) ; 10 mi E Sierra City , N Yuba River, 28 Jun 1976, 6200̍, L and N Herman (1, AMNH) ; Siskiyou Co.: county only (1, CASC) ; 3 mi E McCloud, Elk Creek , 30 Jun 1976, 3200̍, L and N Herman (1, AMNH) ; 5.4 mi SE Seiad Valley, O’Neil Creek , 3 Jul 1976, 1500–2000̍, L and N Herman (1, AMNH) ; Tehama Co.: Snoqualmie Gulch 10 mi SE Manton, 1 Dec 1986, 2850̍, leaf litter, DS Chandler (1, CNCI) ; Toulumne Co.: 10 mi E Buck Meadows , 16 Jun 1984, 3500̍, R Baranowski (1, LUND) ; Tulare Co.: Sequoia Natl Park. , 10 May 1979, R Baranowski (1, LUND) ; Sequoia Natl Park, Halstead Creek , 23 May 1984, R Baranowski (13, LUND) ; Ash Mountain , 17 Mar 1984, flume forebay, R Haines (1, FGAC) ; Tuolumne Co.: 30.5 NE Strawberry near Deadman Creek , 18 Jul 1976, 8000̍, L and N Herman (3, AMNH). Colorado: Breckenridge, 15 Jul 1896, 9600–10,000̍, Wickham (1, MCZC) ; above Ouray , mineral point trail, 1 Jul 1889, 9000– 10,000̍, Wickham (1, MCZC) ; Veta Pass , Jun 1924 (1, MCZC) ; Grand Co.: SE Rabbit Ears Pass, 21 Jun 1975, 9000̍, squirrel middens under conifers, A. Newton, M. Thayer (2, MCZC). Idaho: Boise Co. : N Centerville, 14 Sep 1974, AD Allen (1, PECK) ; Lemhi Co.: continental divide 2.4 mi airline SW of Bannock Pass , 24 Aug 1962, 8500̍, HB Leech (2, CASC) ; continental divide 2.4 mi airline SW Bannock pass, 24 Aug 1969, HB Leech (16, CASC). Montana: Gallatin Co.: Earthquake Lake , 28 Jun 1966, J Haddock (1, EMEC) ; Madison Co.: Hidden Lake Bench, Oct – May 1989, 7400̍, FIT, DL Gustafson (1, MTEC). Nevada: state only (13, MCZC) ; White Pine Co.: Snake Range, 6 mi W Baker, 1984–1985, pitfall trap, D Giuliani (3, FGAC). New Mexico: San Miguel Co. : Gallinas , 6 Aug 1992, JF Cornell (2, CUIC). Oregon: state only (3, MCZC) ; Albany (1, MCZC) ; Portland, 22 Jun (3, OSUC) ; Corvallis , 12 Jun 1925, EP VanDyke (1, CASC) ; Clarks , 10 Jan 1961, H Foster (1, RLWE) ; nr Plains , 1 Apr 1956, fir slab wood, K Goeden (5, RLWE) ; Benton Co.: nr Corvallis, Mary’s Pass , May 1966, rotary net trap (3, CUIC) ; Corvallis , 23 Jun 1974, from nest of Neotoma fuscipes, D Carslon (2, FGAC) ; Clakamas Co.: Salmon River nr Zigzag , 27 Aug 1982, R Baranowski (3, LUND) ; Harney Co.: Steens Mt N side Loop Rd , 12 May 1972, aspen­juniper duff, E Benedict (1, CNCI) ; Steens Mt, Fish Lake Rd , 19 Jul 1971, 6000̍, juniperaspen duff, HE Benedict (1, PECK) ; 15 mi E Frenchglen Lily Lake , 29 Jul 1971, aspen duff, E Benedict (6, CNCI) ; Klamath Co.: Kimball St. Park. Wood River Spring, 2 mi N Fort Klamath, 20 Jun 1978, J Schuh, L and N Herman (1, QDWC) ; PoLake Co.: 0.5 mi S Buell , 9 Jan 1981, Neotoma nest 15̍ off ground, PJ Johnson (1, FMNH) ; 1 mi N Suver Jct, old Hwy 99­W, 23 Mar 1980, fecal material, nest of Neotoma sp. , PJ Johnson, J LaBonte (2, FMNH) ; Buell , 27 Sep 1981, fecal chamber of Neotoma fuscipes, PJ Johnson (2, FMNH) ; 3 mi S Airlie , 23 Mar 1980, Neotoma nest, PJ Johnson (2, FMNH) ; Yamhill Co.: Muddy Valley, 2 Feb 1982, Neotoma nest, fence post, PJ Johnson (1, FMNH). Utah: Uintah Mts , Tryol Lake , 26 Aug 1920, 9800̍, HP Chandler (1, CASC) ; Alta (2, MCZC) ; Wasatch Co.: Lost Lake Camp, Uinta Mountains , 29 Aug 1940, 7800̍, HP Chandler (2, CASC). Washington: Easton (1, CASC) ; Baring, Jul (1, CASC) ; Olympia (1, MCZC) ; King Co.: 14 km S North Bend , 4 Mar 1981, moss on rocks, RE Nelson (1, CNCI) ; Skagit Co.: 2 mi NW Rainy Pass , 31 Jul 1982, M Sorensson (2, LUND) ; 2 mi NW Rainy Pass , 31 Jul 1982, R Baranowski (1, LUND) ; Birdsview , 27 Jul 1982, R Baranowski (1, LUND) .

DISCUSSION: Based on our examination of the type specimens of A. concinnum and A. effluens , these two names refer to the same species following Horn (1880).

This species has been collected from every month during the year. Specimens have been collected in a variety of habitats including pine, juniper, and aspen forests and various sources of litter. The most intriguing habitat, which has yielded numerous specimens, is the nests of Neotoma sp. and Neotoma fuscipes . Elevation records are from 2850 ft (California) to 10,400 ft (California).

Figures

Figs. 3–16. Agathidium concinnum­ and A. pulchrum­group species. 3–15. Heads, dorsal aspect: 3, A. akallebregma. 4, A. hatchi. 5, A. concinnum. 6, A. laetum. 7, A. athabascanum. 8, A. columbianum. 9, A. rusticum. 10, A. repentinum. 11, A. rotundulum. 12, A. atronitens. 13, A. oregonense. 14, A. hamulum. 15, A. politum. 16, A. rusticum, left antenna, dorsal aspect. Bars = 0.5 mm, except fig. 16 bar = 0.25 mm.

Figs. 31–40. Agathidium concinnum­group species, aedeagus: 31, 32, A. akallebregma: 31, ventral; 32, lateral. 33, 34, A. mollinum: 33, ventral; 34, lateral. 35, 36, A. angulare: 35, ventral; 36, lateral. 37, 38, A. hatchi: 37, ventral; 38, lateral. 39, 40, A. concinnum: 39, ventral; 40, lateral.

Fig. 43. Geographic distribution of Agathidium concinnum­group species: A. concinnum = •; A. hatchi = -.

Fig. 2. Agathidium concinnum, dorsal habitus.

Figs. 118–144. Agathidium concinnum­ and A. oniscoides­group species, left male metafemur, ventral aspect: 118, A. concinnum. 119, A. kimberlae. 120, A. vaderi. 121, A. bituberculum. 122, A. oedema. 123, A. gomezae. 124, A. hidalgoense. 125, A. skoliosternum. 126, A. erythromelas. 127, A. rhamphastes. 128, A. megoniscoides. 129, A. grumum. 130, A. triangularum. 131, A. lobosternum. 132, A. potosii. 133, A. popocatepetlae. 134, A. hyle. 135, A. stenomma. 136, A. tribulosum. 137, A. tribulograndum. 138, A. invisitatum. 139, A. multidentatum. 140, A. sejunctum. 141, A. grandidentatum. 142, A. andersoni. 143, A. disgregum. 144, A. oaxacaense. Bars = 0.5 mm.