Iteaphila longipalpis (Melander) Sinclair & Shamshev, 2021

Sinclair, Bradley J. & Shamshev, Igor V., 2021, World revision of Iteaphila with unbranched radial vein (Diptera: Empidoidea: Iteaphilidae), Zootaxa 4968 (1), pp. 1-89 : 49-51

Iteaphila longipalpis (Melander) comb. nov.

( Figs 8 , 48 , 64 )

Anthepiscopus longipalpis Melander, 1928: 106 . Type locality: Arlington , Washington, USA.

Anthepiscopus longipalpis: Melander, 1965: 455 .

Type material examined. HOLOTYPE ♀, labelled: “Arlington [48°10′52″N 122°8′20″W]/ 5.21.[190]8Was”; “window”; “ TYPE / Anthepiscopus / longipalpis/ Mel. [red label]”; “ALMelander/ Collection/ 1961” ( USNM).

Additional material examined. CANADA. Alberta: Banff NP [51.5°N 116.0°W], 14 mi W Banff , Ledum groenlandicum , 7.vii.1955, GES (1 ♀, CNC) ; Banff NP, 26 km N Lk. Louise, trib. Mosquito Ck [51°37′N 116°19′W], 28.vi.1989, BJS (1 ♂, CNC) . British Columbia: 37 km W Anahim Lake [52°24′N 125°14′W], 6.vii.1992, A. Borkent (2 ♂, CNC); same data except, 48 km NW, 14.vii.1992 (1 ♂, CNC); Cowichan Lk. [48°49′N 124°02′W], 19.vi.1964, J.A. Clapman (2 ♀, CNC); Cultus Lk . [49°04′N 121°58′W], 24.v.1965, F. Schmid (1 ♂, 1 ♀, CNC); Galiano Is. [48°55′N 123°25′W], Spanish Hills, 29.iv.1979, 9.v.1982, G.G.E. Scudder (3 ♀, UBCZ); Kilimat [54°03′17″N 128°39′28″W], 2.vi.1960, JGC (2 ♀, CNC) ; same data except, 30.vi.1960, GES (1 ♂, CNC) ; King Salmon Lk. , 58°43′N 132°54′W, 15.vii.1960, R. Pilfrey (1 ♀, CNC); Kitsumkalum Lk. [54°43′22″N 128°46′34″W], 20 mi N Terrace, 31.v., 16.vi.1960, JGC (1 ♂, 1 ♀, CNC) ; Kleanza Ck [54°36′05″N 128°24′11″W], 14 mi E Terrace, 17.vi., 4.vii.1960, CHM (2 ♀, CNC) ; same data except, 19.vii.1960, W. R. Richards (2 ♀, CNC); same data except, 29.vi., 4.vii.1960, JGC (1 ♀, CNC) ; same data except, 17.vi.1960, B. Pilfrey (1 ♀, CNC); Mission City [49°2′30″N 122°14′41″W], 3 and 9.vi.1953, W. R.M. Mason (2 ♂, 1 ♀, CNC); Mt. Allard , 23 mi N Terrace, 11.viii.1960, CHM 1 ♀, CNC ); Mt. Thornhill, nr Terrace [54°30′44″N 128°32′18″W], 21.vi., 14.vii.1960, JGC (1 ♂, 7 ♀, CNC) ; same data except, 14 and 26.vii.1960, B. Heming (1 ♂, 1 ♀, CNC); same data except, 14.vii.1960, CHM (1 ♀, CNC) ; 8 km E Sicamous [50°53′N 118°54′W], 22.v.1992, AB (1 ♀, CNC) ; 24 km NE Sicamous , 19.v.1991, AB (1 ♀, CNC) ; 13 km SE Port Renfrew [48°30′N 124°18′W], 5.vii.1991, AB (4 ♀, CNC) ; Squamish, Diamond Head Tr. [49°45′N 123°03′W], 4000 ft, 28.viii.1953, GJS (1 ♀, CNC); same data except , 3500 ft, 5.viii.1953, E. Mason (1 ♂, CNC); 10 mi N Terrace, Glacier Ck , 7.vii.1960, JGC (7 ♀, CNC) ; 32 mi SW Terrace , 4–6.vi.1960, GES (2 ♀, CNC) ; same data except, 6.vi.1960, R. Pilfrey (1 ♀, CNC); Vancouver Is., Lk . Cowichan, 48°49′N 124°03′W, 28.vi.1983, J.A. Downes (1 ♀, CNC) . Yukon: North Fork Crossing, mi 42 Peel Plateau Rd. [64°27′N 138°17′W], 3500 ft, 24.vi.1962, PJS (1 ♀, CNC) . USA. Alaska: Isabel Pass [63°12′42″N 145°29′17″W], mi 206 Richardson Hwy, 2900 ft, 15.vi.1962, PJS (1 ♀, CNC); Thane [58°15′51″N 134°19′49″W], 1.viii.1952, WCF (1 ♀, WSU); White Pass [59°28′47″N 135°15′22″W], 10 mi Skagway, 30.vii.1996, PHA & MA (3 ♀, USNM) . Oregon: Benton Co., Mary’s Peak Cpgd, Meadow Edge Tr. , along Upper Parker Ck , 44°30′32.8″N 123°33′36.0″W, 1077 m, 4.vii.2014, JMC (1 ♂, CNC) ; Clackamas Co., Mt. Hood NF, Tollgate Cpgd [45°19′21″N 121°54′24″W], 22.vi.1977, DDW (8 ♀, CAS); Clackamas Co. , Bruin Run Ck , Camp Ck Cpgd [45°18′16″N 121°52′02″W], 24.vi.1974, PHA (2 ♀, CAS) ; Clackamas Co., Mt. Hood NF, Still Ck Cpgd , 45°17.703′N 121°44.313′W , 1150 m, 9.vii.2013, BJS (1 ♀, CNC) ; Marion Co., Silver Falls SP, 23 and 24.vi.1974, PHA (7 ♀, CAS) ; Marion Co., Willamette NF, French Ck Rd. , 44°45.969′N 122°11.211′W , 660 m, 10.vii.2013, BJS (1 ♀, CNC) . Washington: Clallam Co., Olympic NF, Klahowya SP [48°03′52″N 124°06′41″W], Soleduck R ., 30.vi.1974, PHA (1 ♀, CAS) ; Clallam Co., Olympic NP , meadow below Sunrise Ridge, Mt. Angeles [47°59′40″N 123°27′59″W] , 1550 m, 22 and 24.vii.1978, DDW (4 ♂, CAS); same data except, Lake Creek, 24.vii.1978 (9 ♀, CAS); Clallam Co., Beaver Lk ., 5 km NE Sappho, 48°06′51″N 124°14′40″W, 7.vi.2004, C.J. Borkent (4 ♀, CNC); Clallam Co. , Olympic NP , nr. Fairholm Cpgd , 48°04′12″N 123°55′7.5″W, 24.vi.2005, C.J. Borkent (1 ♀, LEM); same data except, CNC161443 , CNC161444 , CNC161445 , CNC161446 (1 ♂, 3 ♀, barcoded, LEM) ; Everett [47°58′45″N 122°12′06″W], 20.vi.1920, A Spuler (6 ♀, WSU); Everett , 19.vi.1920, 4.vii.1924, ALM (1 ♂, 27 ♀, USNM) ; Ilwaco [46°18′45″N 124°1′47″W], 5.v.1918, ALM (1 ♀, USNM) ; King Co., Seattle, Issaquah [47°32′8″N 122°2′36″W], 23.vii.1988, R. Danielsson (1 ♀, MZLU); King Co., 5.5 km W Greenwater, nr Federation Forest SP, Jct Hwy 410 & W-6300, 47°09′28″N 121°43′40″W, 515 m, 25.vi.2005, C.J. Borkent (1 ♀, LEM); Lewis Co., trib. Catt Ck , 2847 ft, 46°41′53″N 121°57′46″W, 16.vi.2018, JMC (1 ♂, 1 ♀, CNC) ; Lewis Co., stream at mi 9 Skate Ck Rd, 2460 ft, 46°43′32.01″N 121°49′51″W, 15.vi.2018, JMC (1 ♂, 2 ♀, CNC) ; Lewis Co., Knuppenburg Lk., 17 km ENE Packwood, Hwy 12, 1260 m, 46°37′46″N 121°24′57″W, 11.vi.2004, C.J. Borkent (1 ♀, LEM); Mason Co. , 16 kmW Lilliwaup, Staircase, Olympic NP, N Fk Skokomish R., 47°31′06″N 123°19′58″W, 280 m, 10.vi.2004, C.J. Borkent (1 ♀, LEM); Mt. Constitution [48°40′39″N 122°49′52″W], 17.v.1910 (2 ♀, UNSM); Mt. Baker, Skyline Tr [48°52′51″N 121°51′52″W], 10.viii.1925, ALM (3 ♀, USNM) ; Mt. Rainier, Van Trump Ck [46°47′34″N 121°46′33″W],. ix.1917, ALM (1 ♀, USNM) ; Mt. Rainier NP, nr Cougar Cpgd [46°46′03″N 121°47′39″W], 8.vii.1989, BJS (2 ♀, CNC) ; Mt. Rainer NP, ck nr White River Cpgd [46°54′09″N 121°38′28″W], 1340 m, 3.viii.1977, DDW (2 ♂, CAS); same data except, Fish Ck, West Side Rd , 910 m, 1.viii.1977 (4 ♀, CAS); same data except, along Sunbeam Ck above Louise Lk. [46°46′16″N 121°43′23″W] , 1520 m, 4.viii.1977 (1 ♀, CAS); Mt. Rainier NP, Narada Falls to Reflection Lk. Tr. , 46°46′N 121°44′W, 1400 m, 17.vii.2012, BJS (1 ♂, 10 ♀, CNC) ; same data except, CNC197570 , CNC197571 , CNC197572 (2 ♂, 1 ♀, barcoded, CNC) ; same data except, ex. Erythronium montanum (1 ♂, CNC); same data except, Westside Rd nr. Fish Ck , 46°46.743′N 121°53.069′W, 880 m, 4.vii.2013 (1 ♂, 16 ♀, CNC); same data except, Stevens Ck Tr. , 46°45.338′N 121°38.530′W , 1400 m, 17.vii.2012 (1 ♀, CNC); Mt. Rainier NP, Longmire Tr., marsh W Inn , 46°44′56″N 121°48′51″W, 850 m, 25.vi.2005, C.J. Borkent (2 ♀, LEM); Olympia [47°2′16″N 122°54′3″W], 22.vi.1920, ALM (1 ♂, 2 ♀, USNM) ; Olympic NP, Sol Due River [47°58′00″N 123°51′28″W], 6.vii.1978, D.E. Hardy (1 ♀, WSU); Pluvius [46°32′53″N 123°24′32″W], 10.vii.1917, ALM (1 ♀, USNM) ; Tacoma [47°14′29″N 122°27′34″W], 27.v.1917, ALM (1 ♂, USNM) ; Vashon [47°24′58″N 122°28′6″W], 28.v.1917, ALM (2 ♂, 11 ♀, USNM) . Wyoming: Sheridan Co., Black Mtn [44°44′17″N 107°23′16″W], pine forest, ypans, dung, 5–20.vii.1990, J. Swann (1 ♂, 11 ♀, DEBU); Teton Co. , Togowte Pass [43°45′00″N 110°04′48″W], 9000 ft, 22.vii.1953, R. R. Driesbach (1 ♂, CNC) .

Possible additional material. USA. California: Placer Co., E end Bear Valley [39°18′34″N 120°39′54″W], 1.vi.1964, PHA (2 ♀, CAS) .

Recognition. This species is distinguished by 4-serial acrostichal setae, thinly pruinescent scutum with dark chaetotaxy, elongate mouthparts, pale legs and features of the male terminalia (hypoproct process extending beyond cercus; narrow, upright surstylus) ( Fig. 48 ).

Redescription. Wing length 3.2–3.8 mm. Male ( Fig. 8 ). Head dark brown in ground-colour, with pale brown to black setation, occiput thinly to densely greyish pollinose. Eyes holoptic, with upper ommatidia enlarged. Frons represented by small triangular space just above antennae, bare, greyish pollinose. Ocellar triangle prominent, with 2 pairs of long hair-like setae. Postvertical setae subequal to postocular setae, thin; occiput covered with numerous similar setae in lower part, pale brown posterior to mouthparts. Antenna dark brown; scape short, slightly shorter than globular pedicel, both with short setae; postpedicel rather narrow, nearly 4 times longer than basal width, base somewhat expanded and smoothly tapered; stylus ca 3–4 times longer than wide, sensillum-tipped; segment 9 tubular, 2–3 times longer than wide, apical sensillum about as long as segment 9. Proboscis very long, projected obliquely; labium longer than head height; palpus slender, projected parallel to labrum, somewhat shorter than labrum.

Thorax dark brown in ground-colour with posterior part of postpronotal lobe and postalar tubercle often paler, with brown to black setation; scutum viewed dorsally entirely velvety brown, slightly matt, without vittae; viewed anteriorly densely pruinose; mesopleuron uniformly greyish brown pollinose. Proepisternum with a few hair-like setae. Postpronotal lobe with 1 long thin and several shorter setae. Mesonotal setae distinct, thin; acr 4-serial, arranged in 2 pairs of closely spaced irregular rows, lacking on prescutellar depression, distance between paired rows wider than length of acr; dc uniserial (with some additional setulae in anterior part), offset from row anteriorly, slightly longer than acr, 2–3 distinct prescutellar dc; 1 ph, 1 presut spal (sometimes with additional setulae), 3–4 npl (with a few additional shorter setae), several psut spal setulae, 1 pal and several short setulae, 6–7 pairs of sctl.

Legs pale yellow to yellowish brown, coxae and tarsi somewhat darker. Coxae and trochanters with unmodified hair-like setae. Fore femur with row of short anteroventral hair-like setae, especially distinct apically; and somewhat longer setae on posteroventral, dorsal and posterior faces. Mid femur with moderately long posteroventral bristly setae along entire length, bearing some moderately long setae on dorsal and posterior faces. Hind femur with long anteroventral and dorsal setae along whole length. Tibiae with row of slightly prominent thin posterodorsal setae. Tarsomere 1 of mid and hindlegs with pair of rows of stiff ventral setae; tarsomere 5 not flattened on all legs; pulvilli broad, shorter than tarsal claw.

Wing distinctly uniformly pale infuscate; basal costal seta absent; pterostigma distinct brownish, elliptical, overlapping apex of R 1; anal lobe very prominent, acute. Sc complete; R 2+3 often slightly bowed posterior to pterostigma; R 4+5 unbranched; cell dm broad, longer than basal cells, truncate apically; base of M 2 (crossvein) more than one-third length of dm-m, M branches widely separated; dm-m crossvein slightly concave. Apex of cell cua recurved; CuA+CuP long, pale, ending short of wing margin. Halter with brown knob, base of shaft paler.

Abdomen brown, subshiny, finely brownish grey pollinose, basal 4 segments paler; covered with long mostly yellowish setae, setae dark or pale on apical segments. Terminalia ( Fig. 48 ) concolorous with abdomen, large. Hypandrium with numerous short setae, rounded basally, narrowed apically with narrow, folded apex, with roughened posterior apex; gonocoxal apodeme long and expanded apically; inner apodeme expanded and flattened, slightly longer than length of gonocoxal apodeme; postgonite long, flattened plate, arched, truncate apically with lateral projection. Phallic guide extended well beyond epandrium, parallel with phallus and bent nearly at right angles subapically; bent apical section paired with jagged or toothed surface apically; apex rounded. Epandrium not inflated laterally; dorsal bridge narrow; produced distally into slender, dorsally projecting, slightly curved surstylus; inner margin of surstylus with short tooth-like projection medially. Phallus slender, arched well beyond epandrium, bent more than right angles subapically; apical section sickle-shaped, tapered and very slender; ejaculatory apodeme plate-like, rounded, greatly expanded anteriorly, nearly twice length of gonocoxal apodeme. Cercus short, triangular, one-third length of epandrium; narrowed apically with apex pointed, extended free from epandrium; hypoproct produced into pair of very long, slender processes, longer than cercus.

Female. Similar to male, except as follows: Eyes dichoptic; ommatidia equally small. Frons very broad, somewhat widened toward ocellar tubercle, shiny to thinly pruinescent, with marginal setulae. Scutum pruinescent. Scutellum pruinose, usually with 5–6 pairs of setae. Legs similar to male. Abdomen with shorter, less prominent pale setae. Cercus brownish, long, slender, covered with brownish setae.

Distribution. Nearctic: Canada (Alberta, British Columbia, Yukon), USA (Alaska, Oregon, Washington, Wyoming). This species is confined to the western Cordillera of North America from Alaska and Yukon to Wyoming, with most records along the northern Pacific Coast Ranges ( Fig. 64 ).

Remarks. This species is very similar to I. sierrensis sp. nov. and I. flavipilosa in terms of male terminalia, but is distinguished by the different lengths of the phallus and phallic guide and orientation and shape of the surstylus.

Figures

FIGURES 8–10. Species of Paraiteaphila and Iteaphila with unbranched R 4+5, lateral view. 8, I. longipalpis, male, scale bar = 1 mm; 9, I. parastentor, male, scale bar = 0.5 mm; 10, Paraiteaphila sp., female, scale bar = 0.75 mm.

FIGURES 45–48. Male terminalia of Iteaphila with unbranched R, lateral view. 45, I. gracilis sp. nov.; 46, I. grandis sp. 4+5 nov.; 47, I. lolo sp. nov.; 48, I. longipalpis (Melander). Scale bar = 0.1 mm. Abbreviations: cerc—cercus; epand brg—epandrial bridge; hyprct proc—hypoproct process; ph—phallus; ph gd—phallic guide; sur—surstylus.

FIGURES 62–65. Distribution of Iteaphila with unbranched R. 62, I. dichoptica sp. nov.; 63, luteitibia sp. nov., I. incus sp. 4+5 nov.; 64, I. longipalpis (Melander); 65, I. nupta (Melander), I. subnupta sp. nov.