319 

 Leech and Chandler: Coleoptero 



6. Elytra with several distinctly impressed and entire 

 discal striae, 1st scarcely more distant from sutural 

 than latter is from suture (form rather broad as a rule, 

 distinctly less than twice as long as wide) 7 



— Elytra with 2 lightly impressed or unimpressed discal 

 series of coarser punctures, 1st twice as distant 

 from sutural series as the latter is from suture 9 



7. Outer discal striae nearly as distinct and complete 

 as the inner ones; lateral margin of pronotum not 

 appreciably wider posteriorly, prosternal intercoxal 

 carina not terminating anteriorly in a prominence; 

 front and middle tarsi of male very little wider than 

 those of female; elytral coloration varying from almost 

 entirely yellowish to entirely black (fig. 13:166); 

 smaller species, 3.5-4.5 mm. long; Pacific Coast . . 



striatellus (LeConte) 1852 



— Outer discal elytral striae feeble and more or less 

 indistinct or incomplete; prosternal intercoxal carina 

 terminating anteriorly in a distinct prominence; front 

 and middle tarsi of male broader than in female 8 



8. Side margin of pronotum gradually widening from apex 

 to base, where it is at least 1/2 as wide as a median 

 antennal segment; pronotum with longitudinal rugae at 

 sides and base, surface shiny between the punctures, 

 which are irregular in size and distribution and much 

 larger than those of elytra; elytra usually maculate; 

 larger and more robust species, 5.0-5.5 mm. long; 

 southern California funereus (Crotch) 1873 



— Side margin of pronotum only slightly wider posteriorly; 

 pronotum with few or no rugae, surface often reticulate 

 between the punctures which are evenly distributed 

 and only a little larger than those of elytra; elytra 

 black; smaller species, 4.5-4.9 mm. long; California 

 dolerosus Leech 1945 



9. Claws of front tarsi of male elongate, nearly '/2 as 

 long as tarsi; smaller species, 4 mm. long; Oregon, 

 northern California expositus (Fall) 1923 



— Claws of front tarsi of males not appreciably modified, 

 not longer than claw-bearing segment; size larger, 

 4.25-5 mm.; Holarctic . . . . griseostriatus (Degeer) 1774 



10. Elytra maculate, with 2 large yellow blotches at base, 

 2 smaller ones behind middle, and usually 2 little 

 ones at apices; elytral punctation dual, consisting 

 of fine close punctures, with numerous scattered 

 coarse punctures which become sparser and smaller 

 toward sides and apex of elytra; northern California 



quadrimaculatus (Horn) 1883 



— Elytral markings vittiform; elytral punctation close, 

 fine, uniform, not dual (except for the usual longitu- 

 dinal series of larger punctures) 11 



11. Outline of pronotum and elytra nearly uniform, pronotum 

 with hind angles well defined, nearly rectangular 



(return to 9) 



— Outline of pronotum and elytra discontinuous, pronotum 

 broadly rounded posteriorly at sides, without evident 

 hind angles 12 



12. Size larger (average length 4.35 mm.); elytra dull, 

 surface deeply reticulate between punctures which 

 are separated by their own width or less; middle 

 femora of male subangulate on lower (posterior) edge; 

 middle tibiae of males broad in apical third, thence 

 somewhat sinuately narrower toward base on inner 

 margin sharp and bladelike; New Mexico, southeast 

 California coelamboides (Fall) 1923 



— Size smaller (average length 3.55 mm.); elytra moder- 

 ately shining, surface finely reticulated between 

 punctures which are separated by more than their 

 own widths; middle femora and tibiae of male as in 



preceding species; Death Valley region 



panaminti (Fall) 1923 



Key to the California Species of Oreodytes 

 Adults 



1. Hind femora strongly curved at inner end, at attach- 



ment to trochanters; elytra yellow, each elytron with 

 suture, 0> narrow vittae, and 2 or 3 lateral .spots, 

 black or piceous; head yollow with V-.sliaj>ed median 

 piceous mark; elytra sparsely, finely punctate; form 

 elongate, depressed; elytra of female toothed externally 

 near apex; length 1.5-5 mm.; Colorado, British Colum- 

 bia, Alaska, ?California semiclarus (Fall) 1923 



— Anterior margin of hind femora almost straight to base; 

 elytra variously marked, never with 6 narrow vittae; 

 head all yellow, or black adjacent to eyes; elytra of 

 female not toothed 2 



2. Form elongate -oval; pronotum much narrower than 

 elytral bases, the outline thus discontinuous; head 

 black adjacent to eyes; a groove paralleling and just 

 within each metacoxal line; elytra yellow or reddish- 

 yellow, with black markings; length 4 mm.; northern 

 California bisulcatus (Fall) 1923 



— Form more broadly oval; pronotum only a trifle narrower 

 than elytral bases; head pale 3 



3. Elytra with impressed suosutural series of punctures, 

 traces of discal and lateral longitudinal series, and 

 a transverse line of coarse punctures at base of disc; 

 elytra with broad discal piceous cloud; length about 

 3.5 mm.; Pacific Coast subrotundus (Fall) 1923 



— Elytra without an impressed subsutural line of punc- 

 tures 4 



4. Elytra virtually or entirely impunctate, except for a 

 discal and subhumeral line of fine punctures; mid- 

 metasternum not differentiated, smooth and evenly, 

 rather finely punctate; elytral markings linear, lines 

 frequently more or less fused. Length 2.7-3 mm.; 

 Pacific Coast obesus (LeConte) 1866 



— Elytra with numerous irregularly spaced and rather 

 coarse shallow punctures; mid-metasternum differ- 

 entiated, sulcate and coarsely, irregularly punctate 



5 



5. Mid-metasternum broadly, shallowly depressed, coarsely, 

 irregularly punctate, subrugose at sides; sides of 

 pronotum nearly straight; in dorsal view, hind margin 

 of pronotum decidedly not at right angles to longi- 

 tudinal axis of body; lateral margins of elytra, as 

 viewed from side, rather strongly arcuately ascending 

 at base; length 3-3.5 mm.; northern California 



abbreviates (Fall) 1923 



— Mid-metasternum narrowly, more deeply depressed, 

 sides nearly straight, sharply margined, margins 

 joining anterior ends of hind coxal lines; sides of 

 pronotum evenly arcuate; hind margin of pronotum, 

 except for scutellar lobe, virtually at right angles to 

 longitudinal axis of body; lateral margins of elytra 

 much less strongly ascending at base; length 2.8 to 

 3 mm.; California, Nevada .... picturatus (Horn) 1883 



Key to the California Species of Agabus 

 Adults 



1. Vittate species, elytra black with testaceous stripes 

 which are often broader than black areas 2 



— Nonvittate species 3 



2. Elytral reticulation with meshes of irregular shapes 

 and very unequal sizes, each usually with 1 or 2 small 

 punctures; pronotum rufotestaceous to piceous, paler 

 laterally; elytra pale testaceous, hyaline, each elytron 

 with about 5 black vittae, discal ones often coalescing; 

 northern California lineellus LeConte 1861 



— Elytral meshes irregular in shape, but very small 

 and of fairly uniform size, without small punctures; 

 pronotum rufotestaceous with anterior and posterior 

 discal transverse black band; elytra varying from 

 testaceous with 3 or 4 black vittae on each elytron, 

 to brack with outer margin only pale (fig. 13:16c); 

 United States .... (in part) disintegrates (Crotch) 1873 



3. Outline of pronotum and elytra discontinuous, pronotum 

 somewhat constricted basally where it is only 7/8 width 

 of base of elytra; northwest America, Lassen County 



bjorkmanae Hatch 1939 



