1873.] 



32 



o 



[Horn. 



strife 2-3-4 subequal, slightly shorter than the first ; fourth arching at 

 base, joining the entire suitural. Pj^gidium and propygidium moder- 

 ately coarsely, but not densely punctured. Prosternum broad, sparsely 

 punctured, strife deeply impressed, slightly divergent in front and 

 scarcely ascending. Legs brownish red. Anterior tibial finely and dis- 

 tantly denticulate, middle and hind tibiae finely biseriately spinulose. 

 Length .10 inch ; 2.5 mm. 



Closely allied to the preceding species, differing in its smaller size, 

 scarcely evident external subhunieral and the disconnected internal sub- 

 humeral. 



One specimen, Pennsylvania. 



I have seen specimens from Oregon and Vancouver, differing from 

 the unique of infaustus in having the extei-nfil subhunieral somewhat 

 more distinct, and by the form more regularly oval. I do not feel in- 

 clined to seijarate them at present, as I find no tangible character on 

 which to found a specific distinction. 



Group YI. 



Prosternum more or less convex at summit, strise entire, divergent in 

 front, terminating in a fovea. Supra-orbital stria rarely present. Thorax 

 rarely fimbriate. 



The species are more numerous than in the preceding groups, and are 

 distinguished in the following manner : 



Pygidium with a deep marginal groove. 



Groove following the entire apical and lateral mar- 

 gins ajiieicollis. 



Groove at apex only assimilis. 



Pygidium not grooved. 



Thorax not ciliate at the sides. 



Elytra punctured at apex, and thorax at sides, 

 only. 

 Elytra densely aciculately punctured, stria3 short. cubaicola. 



Elytra sparsely punctured, striie moderately 

 long. 

 Fourth dorsal and sutural united, the latter 

 strongly impressed at base. 

 Sutural stria continued by punctures to apex, 

 elytra at apex ra,ther coarsely punctured. 



External subhumeral short, distinct conformis. 



External subhunieral stria entirely absent. 



Dorsal striae hooked at base placidus. 



Dorsal strife simple vescus. 



Sutural stria entire, usually joining the apical 

 line. 

 Dorsal strife 1-3 hooked at base ; thorax 



distinctly punctured at sides parumpunctatus. 



