1S73.] 



325 



[Horn. 



striae 2-3-4 subequal, sliglitly shorter than the first ; fourth arching at 

 base, joining the entire sutural. Pygidium and propygidiuin moder- 

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

 punctured, striae deeply impressed, slightly divergent in front and 

 scarcely ascending. Legs brownish red. Anterior tibiae 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 subhumeral 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 external subhumeral somewhat 

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

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

 which to found a specific distinction. 



Group VI. 



Prosternum more or less convex at summit, striae 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 aeneicollis. 



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, striae short. cubaecola. 



Elytra sparsely punctured, striae moderately 

 long. 

 Fourth dorsal and sutural united, the latter 

 strongly impressed at base. 

 Sutural stria continued by punctures to apex, 

 elytra at apex rather coarsely punctured. 



External subhumeral short, distinct conformis. 



External subhumeral stria entirely absent. 



Dorsal striae hooked at base placidus. 



Dorsal striae simple vescus. 



Sutural stria entire, usually joining the apical 

 line. 

 Dorsal striae 1-3 hooked at base ; thorax 



distinctly punctured at sides parumpunctatus. 



