316 



Leech and Chandler: Coleoptera 



finely margined and projecting (male), or neither — 

 margined nor projecting (female); British Columbia 

 to California, "Crane Valley" (=Bass Lake, Madera 



County?) ornatellus Fall 1917 



— Hind coxal plates finely punctate, punctures smaller 10 



than those of base of pronotal disc; elytra finely 



punctate, with obvious golden pubescence; clypeus 

 neither margined nor projecting in either sex; Calif or- 11 

 nia to Baja California aubtilis (LeConte) 1852 



Key to the California Species of Desmopachria 

 Adults 



1 . Each elytron with an antemedian longitudinal impres- 

 sion in a marginal reddish spot; punctation of disc 

 of pronotum as coarse and sparse as that of elytra; 

 elytral suture broadly and sinuately black (fig. 13:15<i); 



southern California, Baja California 



latissima LeConte 1852 



— Elytra without antemedian lateral impressions and 

 reddish spots; punctations of pronotal disc much 

 finer and denser than that of elytra; elytral suture 

 narrowly black (fig. 13:15c); Baja California, Arizona, 

 Texas dispersa Crotch 1 873 



Key to the California Species of Hygrotus 

 Adults 



12, 

 13, 



1. Head with front margined anteriorly 2 



— Front not margined anteriorly 5 



2. Under surface black; larger, more elongate species 

 with vittate elytra, length 4-4.8 mm.; northern United 

 States masculinus (Crotch) 1874 14, 



— Under surface rufotestaceous; small, convex, ovate 

 species, 2.5-3.2 mm. long 3 — 



3. Form more elongate-oval, not markedly convex; north- 

 west U.S intermedins (Fall) 1919 



— Form broad and very convex 4 



4. Large punctures of basal half of elytral disc rounded, 15. 

 shallow, the bottoms clearly visible; fore tarsi of 

 male dilated; California . . . .hydropicus (LeConte) 1852 



— Large punctures of elytral disc rounded or irregular, 

 deep, the bottoms not visible; fore tarsi of male hardly 

 wider than in female; northern U.S. and adjacent — 

 Canada sayi 3alfour-3rowne 1944 



5. Last ventral abdominal sternite with an obtuse tumidity 16. 

 on each side, more prominent in the male; northwest 

 U.S. and adjacent Canada... tumidiventris (Fall) 1919 



— Last ventral sternite without tumidities 6 — 



6. Dorsum fulvo- to rufotestaceous, elytra with distinct 

 vittiform markings; large (4.5-5.5 mm.), elongate 

 species 7 17 



— Dorsum flavo-, rufo-, or piceo-testaceous or piceous- — 

 brown, elytral disc often with broad nubilous markings, 18 

 which are never distinctly vittate (under surface black) 



8 _ 



7. Elytra shining, with impressed lines of serial punctures 

 in basal half and intervals with intermixed fine and 

 very coarse punctures; or dull, serial punctures not — 

 in impressed lines, and of same size as those of 

 intervals (fig. 13:12e) (Holarctic) 



(in part) impressopunctatus (Schaller) 1783 



— Elytra shining or dull, serial punctures larger than 19 

 those of interspaces; anterior (inner) protarsal claw 



of male with broad tooth at base; Nevada, Washington; 



Lassen County infuscatus (Sharp) 1882 



8. Elytral interspaces with intermixed coarser and finer 20 

 punctures 9 



— Punctation of elytral interspaces nearly uniform, not 

 obviously dual 10 



9. Larger species, 4.5-5.5 mm. long; metathoracic epister- 



num shagreened, usually coarsely punctate (Holarctic) 



(= males and some females of) 



impressopunctatus (Schaller) 1783 



Smaller species, 3.5-4 mm. long; metathoracic epister- 

 num shining, usually impunctate. Sierra of California 



(=males and some females of) 



nigrescens (Fall) 1919 



Front femora and middle tibiae of male modified .... 11 

 Front femora and middle tibiae of male normal, similar 



to those of female 12 



Head with median pale spot at base; middle femur 

 robust, curved, lower margin impressed and flattened 

 in apical half for reception of tibia; front femur of 

 male with a transverse impression whose lower margin 

 forms a deep semicircular emargination in ventral 

 edge of femur; lower margin of tibia of male sinuate, 

 widest at basal quarter and apex; middle tibia of 

 female parallel-sided, lower margin suddenly con- 

 stricted at base; known only from Oakley, Contra 



Costa County curvipes (Leech) 1938 



Head without median pale spot at base; middle femur 

 slender, nearly straight and parallel-sided, apex very 

 slightly impressed for reception of tibia; front femur 

 of male with patch of dense short pubescence apically, 

 middle tibia parallel-sided, lower margin produced 

 inwardly at apex; middle tibia of female an elongate 

 triangle, gradually widening from base to apex; southern 

 California, north at least to Oakley, Contra Costa 



County; Marin County pedalis (Fall) 1901 



Larger species, 4.5-5.5 mm. long 13 



Smaller species, 3-4 mm. long 14 



Ventral surface uniformly shagreened between punc- 

 tures, giving a velvety luster (fig. 13:12e) (Holarctic) 



(=female form lineellus (Gyllenhal) 1808, of) 



impressopunctatus (Schaller) 1783 



Ventral surface polished, microreticulate in part; 

 male with broad subbasal tooth on anterior (inner) 



front tarsal claw; northwest U,.S 



infuscatus (Sharp) 1882 



Form narrow, twice as long as wide, or even longer 



15 



Form less elongate, varying from very distinctly less 

 than, to nearly twice, as long as wide; anterior claw 

 of fore tarsus of male perceptibly differing from its 



fellow 17 



Anterior claw of front tarsus of male broader, thicker, 

 a little shorter and more sharply bent at base than 

 its fellow (if 2nd segment of front tarsus of male is 

 outstandingly the largest, see couplet 17); California 



collatus (Fall) 1919 



Anterior claw of front tarsus of male slightly thickened 



but otherwise like its fellow 16 



Front tarsi of male narrow, hardly wider than those of 

 female; smaller species about 3 mm. long; Sierran; 



Mono Lake artus (Fall) 1919 



Front tarsi of male broader; larger species, 3.7-4.2 mm. 

 long; coastal; Santa Cruz County to Humboldt County 



sharpi (Van den Branden) 1885 



Dorsal surface dull, opaque 18 



Dorsal surface shining 19 



Head and pronotum black, elytra piceous-brown (=some 

 females); California. . . .(in part) nigrescens (Fall) 1919 

 Head, pronotum, and elytra brownish-yellow or brownish- 

 ferrugineous, with variable piceous markings; northwest 

 U.S. . . .(=some females of) obscureplagiatus (Fall) 1919 

 Head, pronotum, and elytra pale flavotestaceous, 

 elytra usually with piceous markings in apical half; 



broadly oval species; southern California 



(= females of) fraternus (LeConte) 1852 



Front tarsi of male at most only moderately dilated 



20 



Front tarsi of male broadly dilated, nearly or quite 



as wide as the apical width of the tibia 21 



Color above testaceous with a large elytral cloud 

 extending nearly to base; form slightly narrower, 



size usually a little smaller; California 



lutescens (LeConte) 1852 



Color above nearly as in lutescens, but elytral cloud 

 usually less extended basally; elytral markings very 



variable sometimes almost absent; California 



medialis (LeConte) 1862 



