Glaresis caenulenta Gordon and Hanley, 2014

Gordon, Robert D. & Hanley, Guy A., 2014, Systematic revision of American Glaresidae (Coleoptera: Scarabaeoidea), Insecta Mundi 2014 (333), pp. 1-91 : 43-44

Glaresis caenulenta Gordon and Hanley , new species

Description. Male. Length 3.0 mm, width 1.6 mm; body form slightly elongate, widened from elytral base to apical 1/3 ( Fig. 28A ). Color dark yellowish brown. Head with clypeal surface and frons densely rugose, lacking noticeable reticulate ridges, with large, irregular tubercles throughout, setae short, indistinct; vertex without basal carina, surface rugose, lacking reticulation, without tubercles or setae. Clypeal apex emarginate, with small, evenly spaced tubercles, appearing somewhat serrate, lateral angles oblique, angulate ( Fig. 28B ). Mandible pair symmetrical; mesal tooth strong; lateral prominence strong, pronounced; outer margin slightly abruptly rounded. Pronotum with deep, long, transverse fovea in anterior 1/4 extended completely across pronotum, small, slightly transverse fovea on each side of middle in anterior 1/2, wide, deep fovea on each side medially near lateral margin, deep central furrow extended from base to transverse furrow; surface densely rugose, with sparse, setae-bearing carinae, carinae mostly straight in anterior 1/2, somewhat irregular in basal 1/2, setae decumbent, about 1/2 length of carina ( Fig. 28C ); anterior and lateral pronotal margins not bordered, lateral and basal margins crenulate. Elytra with surface slightly shiny, densely microreticulate; all striae strongly carinate, carinae appearing continuous but narrowly interrupted adjacent to space between interval punctures, each carinal segment bearing an apical seta about 1/2 length of segment; intervals with deep, slightly rectangular punctures ( Fig. 28E ). Metasternum long, dull, finely, densely microreticulate, median surface not tuberculate medially, laterally with short, irregularly Y-shaped ridges extended from base to basal 2/3, ridges not forming reticulate pattern, median area flat, with faint median carina extended anteriorly from apical keel 1/2 distance to base; metasternal groove wide, deep, sides abrupt, weakly ridged ( Fig. 28D ). Lateral protibial teeth not evenly spaced, 2nd and 3rd teeth close together. Mesotibia with 3 short, widely spaced spines laterally, tibia slightly projecting at apex ( Fig. 28D ). Posterior metatrochanteral margin serrate with several teeth; posterosuperior surface of metatrochanter with single small tooth, tooth not visible directly in ventral view. Metafemoral surface with widely scattered, elongate, setae-bearing tubercles, microreticulate; width to length ratio 1.0:1.5, with wide flange on anterior margin, posterior margin lacking teeth ( Fig. 28H ); posterosuperior margin with single tooth. Metatibia broadly triangular, surface entirely microreticulate, with small, bifid posteromedian lateral projection, series of small teeth on outer margin from near base to lateral projection, medially with irregular row of coarse tubercles extended from base nearly to projection, inner margin smooth, pubescent ( Fig. 28G ). Apex of 5th abdominal ventrite broadly rounded. Genitalia long, basal piece shorter than parameres, proximal end curved; median lobe shorter than parameres, 1 1/4 times as wide as a paramere, curved upward in apical 1/3, apex rounded in ventral view; parameres weakly curved in lateral view, slightly curved on inner margin, apex bluntly rounded ( Fig. 28F ).

Female. Apex of 5th abdominal ventrite same as in male.

Variation: Length 2.8 to 3.2 mm, width 1.6 to 1.7 mm. Degree of metasternal sculpture varies from sculpture mostly confined to basal 1/2 to having entire basal 2/3 of metasternum heavily sculptured; lateral mesotibial margin occasionally with 4 teeth; posterosuperior metafemoral surface sometimes with 2 teeth.

Type material: Holotype male: Texas: USA, Big Bend, Texas, USA, Dr. Lenczy, 6 1965 ( USNM) . Paratypes, 149: (10) same data as holotype; (4) : Big Bend N.P., Chirhuahuan (sic) desert nr. Nugent Mt. , IV-6-1967, A.&M.E. Blanchard; (27) Brewster Co., Big Bend National Park, K-Bar Cmpgd. , 3400', 29 o 18' N 103 o 10' W, uv light, 29.VI.82, R. S. Anderson; (13) Brewster Co., Big Bend National Park, Grapevine Hills Cmpgd. , 29 o 16' N 103 o 16' W, uv light, 23.VI.82, R. S. Anderson; (1) Brewster Co., Big Bend National Park , Paint Gap Hills, 28.VI.82, R. S. Anderson; (1) Big Bend Nat. Pk., Texas, Boquillas , 1850', May 23 1959, Howden & Becker; (76) Big Bend Nat. Pk., TEX., Tornillo Flat , 3200', May 12 1959, Howden & Becker ; Taken at light; (1) Brewster Co., Stillwell RV Park on hwy. 2627, VI-4-5-1994, E. G. Riley, UV; (1) Brewster Co., Heath Cyn. Ranch, Jct. hwy 2627 & Rio Grande , VI-4-5-1994, Coll. E. G. Riley, UV; (1) Brewster Co., Heath Canyon Ranch , VII-3-1999; (1) Presidio Co., Chinati Hot Sprgs. , 7 mi NE Ruidosa, 8-VIII-2003, H. & A. Howden; (3) TEXAS: PRESIDIO Co. , Big Bend Ranch SP, Colorado Cnyn, N 29 o’ 8.8" W104 o 03'.2" ; 746m; 20 AUG 2006, AD Smith, R. Smith, MJ Paulsen; (1) Presidio Co., West side Marfa , 5000ft., 4-VIII.03, H. & A. Howden, At light; (1) Presidio Co., Marfa , 5000 ft., 2.VIII- 2003, H. & A. Howden, At light; (6) Presidio Co., Big Bend Ranch St. Nat. Area, Colorado Cyn. Riv. Acc. , Vi-5-6-1962, E. G. Riley & C. S. Wolfe, UV light; (1) Lajitas, Texas, s. w. Brewster Co ,, May 19, 1959, Howden & Becker; (2) Winkler Co., 10 mi. NE Kermit , N. Rulien, VII-26-1979. ( CMNC) ( CNIC) ( MJPC) ( TAMU) ( USNM) .

Other specimens: 38: New Mexico: (2) Catron Co., 4 mi. S Glenwood Springs , 5-VI-1987, Robert Gordon; (1) Eddy Co., 26 mi E Carlsbad , 15 July 1977; (8) (Hidalgo Co.) 18 mi. N. Rodeo, Peloncillo Mts. N. M., VII 7 1956, H. & A. Howden; (1) (Dona Ana Co.) Organ Mts., Filmore Canyon , Las Cruces N. M., July 12 ‘56, H. & A. Howden, Light; (4) Hidalgo Co., Animas ,. 5mi. S of town dump at UV light, el 4390ft, 10-VIII-96, Zfalin, col.; (1) 14 mi. N. Rodeo N. Mex., 7 VII 56, Howden; (3) Luna Co., Deming; (9) Otero Co., Three Rivers Petroglyphs , 7-VI-1987, Robert Gordon; (1) Otero Co., 24km SW Alamagordo (rt. 82), 24.VII.1992, H. & A. Howden Lt.; (11) Texas: El Paso Co., red dunes, 24 N of Fabens , VI-23-97, C. Wolfe; (1) Hudspeth Co., Dell City; (5) Val Verde Co., Langtry , 12-V-1976, uv light, Robert Gordon. ( CMNC) ( CNIC) ( KUNHM) ( TAMU) ( USNM)

Remarks. This species is similar to G. gordoni , but differs by having a small, distinct tooth on the posterosuperior metafemoral surface; slightly larger average size; and metasternal surface with more pronounced, closely spaced ridges. Male genitalia also differ with the basal lobe in G. gordoni narrow and “pinched” medially, basal lobe of G. caenulenta wider, not or feebly restricted medially. Glaresis caenulenta could be a primarily Mexican species with its range extending into New Mexico and Texas. Specimens not designated as paratypes differ slightly from the typical, therefore we restrict the type series.

A series in the USNM collection, labeled Portal, AZ, has been identified as G. gordoni , but has the large size, distinct tooth on posterosuperior metafemoral surface, and other characterstics of G. caenulenta . This series is labeled “Portal Arizona, Dr. Lenczy “ and some of the paratypes of G. caenulenta from “Big Bend Texas” were also collected by Dr. Lenzcy. We suspect an instance of mislabeling here, that the series labeled Portal was actually collected in Big Bend. It is certainly not impossible that G. caenulenta is present in southern Arizona via Mexico, but hundreds of specimens from that area have been examined without another occurrence of that species.

Etymology. The specific name is the Latin caenulentus, meaning “covered with mud” in reference to the encrustation of dirt found on nearly all specimens.

Figures

Figures 28A-28H. Glaresis caenulenta, new species. A) Habitus view. B) Clypeus and head surface. C) Pronotal surface and elytra. D) Metasternum with metasternal groove and mesotibia. E) Elytral striae. F) Male genitalia. G) Metaleg, dorsal view. H) Metaleg, ventral view.