362 



Leech and Chandler: Coleoptera 



16. Pronotum without distinct basal carinas, general form 

 spindle-shaped Gonielmia Sanderson 1954 



Gonielmia dietrichi (Musgrave) 1933; 2.3 mm.; 

 black, diagonal elytral markings (fig. 13:52/); 

 southeastern U.S. 



— Pronotum with short sublateral carinae, extending from 

 base to basal 4th or halfway to anterior margin .... 17 



17. Tarsi stout, nearly as long as tibia, distal half of last 

 segment as thick as tibia, claws very large, curved 

 more than 90*; last abdominal segment with side nearly 

 straight, rounded only near apex; 9th antennal segment 

 little wider than 8th, club poorly differentiated; lateral 

 and posterior margins of prothorax smooth; eastern U.S. 

 and Canada Promoresia Sanderson 1954 



— Tarsi less developed, never as thick as tibia, claws 

 shorter and more slender, curved about 90°; last abdom- 

 inal segment usually rounded; last 3 antennal segments 

 more definitely enlarged; lateral margins of prothorax 

 slightly serrate, posterior margin with many small 

 closely placed teeth 18 



18. Claws curved about 90°, last abdominal segment usually 

 evenly rounded; antennae 11-segmented with last 3 

 segments only slightly enlarged, about V/ 2 times as 

 wide as 8th segment; body form less convex with 

 sides of elytra near base nearly straight; U.S. and 

 Canada Optioservus Sanderson 1954 



— Claws smaller, less curved (about 70°), last abdominal 

 segment with apex slightly truncate or emarginate; 

 antennae with 10 or 11 segments, last 3 more differ- 

 entiated, about twice as wide as segments next to 

 them; form variable but usually moderately to strongly 

 convex along medial line and sides of elytra; western 



Heterlimnius Hinton 1935 



19. Second elytral striae short, only about 1/5 as long as 

 1st; larger species, 3.5 to 6 mm.; color black (fig. 

 13:54a 1 ); southwestern Elsianus Sharp 1882 



Elsianus moestus (Horn) 1870; 4.7-4.9 mm.; black; 

 Arizona, may extend into southeastern California 



— Second elytral striae long, equal to 1st; smaller 

 species, 1.4-3 mm 20 



20. Each elytron with 1 sublateral carina; pronotum 

 smoothly convex except for sublateral carinae and 

 transverse impression at anterior two-fifths, no other de- 

 pressions or humps (fig. 13 :55a) 



Neoelmis Musgrave 1935 



Neoelmis caesa (LeConte) 1874; 1.6 mm.; testa- 

 ceous; Texas 



— Each elytron with 2 lateral carinae (rarely 1 in Micro- 

 cylloepus), pronotum either with other impressions 

 or humps, or transverse depression is not located at 

 anterior two-fifths 21 



21. Pronotal hypomera with a belt of tomentum extending 

 from coxae to lateral margin (fig. 13:576) 



Hexacylloepus Hinton 1940 



Hexacylloepus ferrugineus (Horn) 1870; 1.7 mm.; 

 testaceous; Texas, Oklahoma 



— Hypomera with or without tomentum, but if present it 

 never reaches lateral margin 22 



22. Pronotum without a pronounced medial longitudinal 

 depression or groove, usually with a transverse depres- 

 sion at middle; hypomera with tomentum near coxae; 

 prosternal process broad, without parallel sides (fig. 

 13:54a) Heterelmis Sharp 1882 



Heterelmis glaber Horn 1870; 1.9-2.2 mm.; dark 

 brown; San Pedro River, Arizona, Indian Springs, 

 Nye County, Nevada; probably will be taken in 

 southeastern California 



— Pronotum with a pronounced medial longitudinal depres- 

 sion or groove, transverse depression, if present, at 

 anterior two-fifths; prosternal process with sides nearly 

 parallel for at least 1/2 its length (fig. 13:546) 23 



23. Pronotum with a more or less distinct transverse depres- 

 sion at anterior two-fifths; hypomera and epipleura 

 without tomentum; 1.4-2.4 mm. long (fig. I3:52c); 

 U.S. and Mexico Microcylloepus Hinton 1935 



— Pronotum without transverse depression, at anterior 



two-fifths; epipleura without, hypomera usually without 



tomentum; U.S. and Mexico 



Cylloepus Erichson 1847 



Cylloepus parkeri Sanderson 1953; 2.7 mm.; black 

 with rufous maculae; Bloody Basin, Yavapai 

 County, Arizona; may occur in southeastern Cal- 

 ifornia 



Key to California Species of Lara 



Adults 



1. Pronotum with hind angles acute but scarcely more 

 prominent than middle lobes; elytral pubescence 

 uniform; length 6.5 mm.; black; Washington to middle 

 California, along margins of rapid clear streams up to 

 6,000 feet gehringi Darlington 1929 



— Pronotum with hind angles acute and prominent; 

 alternate elytral intervals with pubescence less 

 decumbent, so that elytra appear dark with sericeous 

 lines; length 7.5 mm.; black; British Columbia to 

 southern California, along rapid, clear streams up to 

 5,000 feet avara LeConte 1852 



Key to California Species of Narpus 



Adults 



1. Color black; form narrower, 3 times as long as wide; 

 pronotum less convex, sides nearly straight, anterior 

 width 4/5 of posterior width; length 3-4 mm.; California 



coast range, in rapid, clear streams 



anguatus Casey 1893 



— Elytra black to red, usually with black band across 

 middle; form wider, twice as long as wide; pronotum 

 more convex, sides curving inward anteriorly, anterior 

 width 2/3 posterior; length 3.2-4.2 mm.; western U.S. 

 and Canada, in rapid, clear streams 



concolor LeConte 188 1 



Key to California Species of Oubiraphia 



Adults 



1. Elytra of a uniform dark brown, occasionally with a 

 faint yellowish humeral or subapical spot; length 1.8- 

 2.5 mm.; known only from Clear Lake area, Lake County, 

 where it is abundant along rocky sections of the shore 

 line brunnescens (Fall) 1925 



— Elytra piceous with humeral and subapical light yellow 

 markings, sometimes united into a discal vitta nearly 

 reaching apex; 2.1-2.3 mm.; from vegetation in slow, 

 moving section of Russian River, and a steep foothill 



stream Tehama County giulianii Van Dyke 1949 



(Both of these may prove to be synonyms or subspecies 

 of D. vittata Melsheimer, which is common throughout 

 the eastern- U.S.. with one record from Utah.) 



Key to California Species and 



Subspecies of Microcylloepus 



Adults 



1. Size smaller (1.4-1.6 mm.) and narrower (.5-. 6 mm.), 

 pronotum longer than wide, wing reduced, not reaching 

 tip of elytra; from warm springs in Nevada 2 



— Size larger (1.8-2 mm.) and wider (.8-. 9 mm.); pronotum 

 wider than long; described from eastern U.S. but with 

 several western subspecies or forms, including similis 

 (Horn) 1870, and foveatus LeConte 1874 



pusillus LeConte 1852 



