Systematic revision of American Glaresidae (Coleoptera: Scarabaeoidea) Author Gordon, Robert D. Author Hanley, Guy A. text Insecta Mundi 2014 2014-01-10 2014 333 1 91 journal article 10.5281/zenodo.4645613 1942-1354 4645613 112A1F0B-1A82-4672-842B-A79A21F251D6 Glaresis medialis Gordon Glaresis medialis Gordon 1969: 508 ; Gordon 1970:508 ; Gordon 1974: 91 . Description. Male . Length 3.2 mm , width 1.7 mm ; body form elongate, slightly widened from elytral base to apical 1/3 ( Fig. 10A ). Color dark yellowish brown. Entire head surface densely microreticulate, dull, clypeus and frons with large tubercles (tubercles small in Idaho specimens) separated by diameter of a tubercle or less, setae short, barely visible. Clypeal apex weakly emarginate medially, somewhat sinuate, with large, evenly spaced tubercles, appearing dentate, lateral angles oblique, pronounced, outwardly toothed ( Fig. 10B ). Mandible pair symmetrical; mesal tooth strong; lateral prominence strong, pronounced; outer margin abruptly rounded. Pronotum with all foveae weakly impressed except fovea on each side medially near lateral margin strongly impressed; surface densely rugose, with sparse, setaebearing carinae, carinae short, straight. Elytra with surface feebly shiny, densely microreticulate; all striae slightly convex, not carinate, with row of short setae; interval with shallow, round punctures ( Fig. 10C ). Metasternum long, feebly shiny, finely, densely microreticulate, surface medially flat with faint carina extended from apical keel anteriorly 1/2 distance to mesocoxae, lateral surface without tubercles or ridges ( Fig. 10D ); metasternal groove nearly invisible. Lateral protibial teeth unevenly spaced, basal 2 teeth close together. Mesotibia with 4 short spines laterally, 2 widely spaced spines in lateral emargination, 2 closely spaced spines on median projection, tibia strongly projecting at apex ( Fig. 10D ). Posterior metatrochanteral margin without teeth, apical angle acutely toothed; posterosuperior surface of metatrochanter with single large tooth not visible directly in ventral view ( Fig. 10G ). Metafemoral surface with widely scattered, elongate, setae-bearing tubercles, microreticulate; width to length ratio 1.0:1.6, with narrow flange on anterior margin; posterosuperior margin with single tooth. Metatibia broadly triangular, surface entirely microreticulate, with series of small teeth on outer margin, penultimate tooth largest, a row of sparse, small tubercles extended from base nearly to apex medially, inner margin smooth, pubescent ( Fig. 10F ). Apex of 5th abdominal ventrite truncate. Genitalia long, basal piece shorter than parameres, proximal end curved; median lobe shorter than parameres, tapered from base to broadly rounded apex, very wide, more than twice width of paramere at middle, slightly curved upward before apex; parameres feebly sinuate in lateral view, apex bluntly rounded ( Fig. 10E ). Female . Apex of 5th abdominal ventrite weakly emarginate medially. Variation . Length 3.2 mm to 3.6 mm , width 1.7 to 2.2 mm . Size and density of head tubercles varies from moderate sized, relatively sparse, to large, densely distributed; posterolateral mesotibial spines vary from 3 to 4, spacing also varies; mesotibia with 3 or 4 lateral spines; metatibial apex occasionally reduced, apically blunt. Type locality . Utah , Logan. Type depository . USNM. Temporal distribution . June-July. Geographical distribution . CANADA . British Columbia : Osoyoos; Penticton. UNITED STATES . California : Mono Co., Benton. Idaho : Owyhee Co., Bruneau Dunes; Owyhee Co., Bruneau State Park; Washington Co., Weiser Dunes. Nevada : Pershing Co., Humboldt River, above Rye Patch Reservoir; Pershing Co., Woolsey; White Pine Co., 15 mi. W. Ely. Oregon : Harney Co., Harney Lake dunes; Wasco Co., 8 mi. E. Hwy 26 on 216. Utah : Cache Co., Logan; Millard Co., Confusion Range-Fossil Mt.; Juab Co., 3 mi. S, 22 mi. E Callao; Sevier Lake, 22 mi. S, 33 mi. W Delta; Sevier Co., Richfield; Salt Lake Co., Salt Lake City; Toole Co., E. Dugway Dunes, Dugway Proving Ground; Utah Co., Goshen Warm Springs. Washington : Benton Co., Hanford Site; Franklin Co., Beverly Dunes; Benton Co., McNary Dam; Yakima Co., Toppenish; Winchester. Wyoming : Big Horn Co., Big Horn Canyon Rec. Area; Lincoln Co., Kemmerer; Sweetwater Co., Flaming Gorge, Blacks Fork River. ( BYUC ) ( CASC ) ( CSCA ) ( CICC ) ( JCIC ) ( MJPC ) ( RAAC ) ( RBCM ) ( UBCV ) ( USNM ) ( USUL ) ( WSUC ) Remarks . Glaresis medialis is most similar to G . phoenicis but differs from that species by its heavily tuberculate clypeus and frons; apical clypeal tubercles large; elytral striae rounded, without trace of carinae; and outer metatibial margin with large, posteromedian tooth. This is primarily a northwest United States species with a range overlapping that of G . clypeata , another member of the phoenicis Group.