Glaresis canadensis Brown

Gordon, Robert D. & Hanley, Guy A., 2014, Systematic revision of American Glaresidae (Coleoptera: Scarabaeoidea), Insecta Mundi 2014 (333), pp. 1-91 : 29-30

Glaresis canadensis Brown

Glaresis canadensis Brown 1928: 74 ; Gordon 1970: 509; Ratcliffe 1991: 133; Ratcliffe and Paulsen 2008: 62.

Description. Male. Length 4.0 mm, width 1.2 mm; body form slightly elongate, lateral elytral margins not rounded, robust, widened from elytral base to apical 1/3 ( Fig. 18A ). Color yellowish brown. Head with clypeal surface shiny, tuberculate, apical 2/3 of frons rugose, basal 1/3 of frons with coarse, reticulate sculpture, vertex finely reticulate, without basal carina, setae short, indistinct. Clypeal apex slightly raised, weakly sinuate with feeble median emargination, lateral angles oblique, angulate ( Fig. 18B ). Mandible pair symmetrical; mesal tooth strong; lateral prominence strong, outer margin rounded. Pronotum with distinct, 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, distinct central furrow extended from base to transverse furrow; surface finely rugose, with slightly curved or sinuate setae-bearing carinae, setae decumbent, about 1/2 length of carina; anterior and lateral pronotal margins not bordered, all margins crenulate. Elytra with surface dull, finely microreticulate; all striae strongly raised, convex, carinate, carinae nearly continuous, briefly interrupted adjacent to space between interval punctures; intervals with small, shallow, slightly rectangular punctures ( Fig. 18C ). Metasternum long, dull, finely, densely microreticulate, with dense ridges throughout except smooth posteromedian area, median area flat, with median carina extended anteriorly from apical keel 1/2 distance to mesocoxae ( Fig. 18D ); metasternal groove feeble, indistinct. Lateral protibial teeth unevenly spaced, basal 2 teeth closer together. Mesotibia with 6 spines laterally, tibia slightly projecting at apex ( Fig. 18D ). Posterior metatrochanteral margin without small teeth; posterosuperior surface of metatrochanter with single large tooth near femur ( Fig. 18G ). Metafemoral surface rugose, with widely, evenly spaced, obliquely transverse, setae-bearing tubercles, width to length ratio 1.0:1.5, with weak flange on anterior margin; posterior metafemoral margin angulate next to trochanter; posterosuperior margin with 2 large, widely spaced teeth. Metatibia broadly triangular, surface entirely microreticulate, with large, transverse posteromedian projection on outer margin, small teeth present on outer margin from near base to posteromedian projection, an irregular row of large, raised, nearly vertical tubercles extended from base nearly to apex medially, inner margin smooth, pubescent ( Fig. 18F ). Apical margin of 5th abdominal ventrite weakly rounded. Genitalia long, basal piece longer than parameres, proximal end curved; median lobe slightly shorter than parameres, tapered from base to apex, narrower at middle than a paramere, slightly curved upward in apical 1/3, apex angulate in ventral view; parameres slightly curved before apex in lateral view, margin straight, apex narrowly rounded ( Fig. 18E ).

Female. Apical margin of 5th abdominal ventrite strongly rounded.

Variation. Length 3.3 to 4.3 mm, width 1.8 to 2.5 mm. Posterolateral mesotibial spine number varies from 6 to 7; teeth on posterosuperior metafemoral surface vary from 1 to 2, occasionally a specimen has a third tiny tooth; number of median tubercles on metatibia is highly variable, both in shape and size,

and are sometimes slightly obliquely transverse in apical 1/2, shape and size of lateral posteromedian projection are also extremely variable.

Type locality. Manitoba, Aweme.

Type depository. CNIC.

Temporal distribution. April-July.

Geographical distribution. CANADA. Alberta: 7 mi. S Empress, Alta.-Sask. border; Tp. 5 Rge. 7, W. 4 Mer.; Tp. 20 Rge. 1, W. 4 Mer. (15 mi. SW Empress); Tp. 22 Rge. 1, W. 4 Mer. (5 mi. S. Empress); ll km S Empress, sand dunes. Manitoba: Aweme. UNITED STATES. Arizona: Cochise Co., 5.8 km SE Willcox, Blue Sky road. Idaho: St. Anthony Co., sand dunes. Nebraska: Greeley Co., 10 mi. N Greeley, sandhills, Jct. hwys 218 & 91; Thomas Co., Halsey; Lake Mconaughy Rec. Area. New Mexico: Chaves Co., 24 km W Caprock off Rt. 380, Mescalero Sands Rec. Area North Dakota: Bottineau Co.; Mercer Co., Stanton dunes, 7 mi. E. Hazen. South Dakota: Bennett Co., Martin; Fall River Co., Angostura Dam, S. of Hot Springs. Texas: Andrews Co., 1.3 mi. E of Jct Tx 115 & FR 181; Ward Co., Monahans, sand dunes; Winkler Co., 20 mi. NE Kermit. ( CASC) ( CICC) ( CMNC) ( CNIC) ( CSCA) ( DCCC) ( FSCA) ( JCIC) ( RAAC) ( TAMU) ( USNM).

Remarks. See comparative Remarks under G. inducta . This species was described from southern Manitoba, but northern specimens are rarely collected, probably because cold temperatures limit light trapping possibilities. True G. canadensis specimens were examined from Alberta, Manitoba, Idaho, North and South Dakota, and Nebraska. Large numbers of west Texas specimens are present in collections because many collectors have visited those dunes fields. However, we have recognized no G. canadensis specimens from any locality between Nebraska and west Texas, an extremely unusual distribution, if in fact it is real. In addition we have widely disjunct populations of putative G. canadensis in Arizona and New Mexico. Specimens from these localities appear morphologically identical to typical G. canadensis , therefore we record then as that species. The Arizona specimens were collected along with putative specimens of G. inducta , a situation also found in western Texas. There are probably two or more species here that we cannot distinguish on external morphology. Perhaps molecular analysis will solve this question.

Figures

Figures 18A-18G. Glaresis canadensis Brown. A) Habitus view. B) Clypeus and head surface. C) Elytral striae. D) Metasternum and mesotibia. E) Male genitalia. F) Metaleg and trochanter, dorsal view. G) Metaleg and trochanter, ventral view.