68 CASEY 



broadly ogival at tip, evidently narrower than the prothorax but 

 not so markedly as in productus, the surface with more numerous 

 lines devoid of punctures, the lines just visibly more convex than 

 the rest of the surface ; body (?) larger, notably stouter, more 

 parallel and more shining, the elytra fully as wide as the pro- 

 thorax or a little wider, with the sides more arcuate, also having 

 more numerous flavate hairs on the sloping sides of the pronotum ; 

 hypomera and anterior tibiae in both sexes nearly as in produc- 

 tus. Length 11.4-11.8 mm. ; width 6.06.9 mm - (d\ ?) Cal- 

 ifornia (Colorado Desert) explanatus n. sp. 



8 Body (cP) nearly as in explanatus but rather more abbreviated 



and somewhat smaller in size, feebly shining, piceous-black ; head 

 and prothorax nearly as in explanatus, the antennas somewhat 

 shorter and thicker ; elytra not more than a fourth longer than 

 wide, scarcely narrower than the prothorax, parallel, with the 

 sides feebly arcuate, the surface more even, without longitudinal 

 lines of greater convexity but with the punctures, which are still 

 stronger, closer and more coarsely muricate, especially on the 

 flanks, arranged in very irregular longitudinal areas of greater or 

 less approximation; anterior tibiae similar; basal joint of the hind 

 tarsi similarly not longer than the last two combined. Length 

 10.4 mm. ; width 6.0 mm. (^). Arizona (southwestern). 



vicinus n. sp 



Body more elongate than in vicinus, less black and more castaneo- 

 piceous in color, almost similarly sculptured; head very slightly 

 larger, similarly opaque and finely, sparsely punctate but having 

 the apical reflexed edge continuous and not interrupted at the 

 sinus ; prothorax slightly less transverse and having the basal lobe 

 not very broadly rounded but more narrowly rounded and promi- 

 nent than in any other species, otherwise as in vicinus, except 

 that the apical angles are less blunt and more prominent, the sides 

 just behind them very faintly sinuate ; elytra decidedly more elon- 

 gate, almost a third longer than wide, more evidently narrower 

 than the prothorax than in vicinus but otherwise nearly similar, 

 the sides less arcuate and the punctures sparser ; prosternal process 

 narrower and more feebly margined at apex ; anterior tibiae less 

 abruptly and only moderately prominent externally at tip ; intro- 

 mittent spicule stouter and more punctate, the coriaceous lobe be- 

 tween the lateral alae of the genital segment canaliculate along 

 the middle and not evenly convex as it is in vicinus. Length 1 1 .o 

 mm.; width 5.8 mm. (cT). Arizona (southwestern). 



lobatus n. sp. 



9 Elytral surface smooth. Body oval, very little longer than wide, 



convex, black, shining; head very sparsely punctate in front, the 

 clypeus not incised [at the sides] ; prothorax neither explanate 

 nor ciliate at the sides, very narrowly margined [in original de- 

 scription], without marginal line [Proc. Cal. Acad., 2, IV, p. 

 423], the base bisinuate, the hind angles obtuse, the surface 



