88 MEMOIRS ON THE COLEOPTERA. 



long as the two preceding; prothorax a third wider than long, parallel, 

 the sides slightly rounded before the middle, gradually straighter pos- 

 teriorly, the base rounded, the surface unimpressed; elytra distinctly 

 shorter than wide, with evidently diverging and nearly straight sides, 

 at base very little, at apex distinctly, wider, the suture broadly impressed 

 basally and fully a fourth longer, than the prothorax, the apices feebly 

 sinuato-truncate externally; abdomen parallel, with strongly and evenly 

 arcuate sides, at the middle about as wide as the elytra, the fourth and 

 fifth tergites equal and each longer than those more basal, the micro- 

 reticulation small, transverse though not strigiliform. Length 2.3 mm.; 

 width 0.63 mm. District of Columbia. 



Allied to the last but larger and with peculiar outline of the 

 abdomen and notably long, though somewhat sparse, rather shaggy 

 pubescence. 



The following species is provisionally appended to this subgeneric 

 group but will probably have to be removed ultimately: 



Atheta (Delphota) oscitans n. sp. Subparallel, rather feebly convex, 

 somewhat shining, finely, not asperately or closely punctate, the ab- 

 domen with numerous though not close-set fine punctures and with the 

 micro-reticulation distinct and subtransverse though not strigiliform; 

 pubescence rather long, palish; color blackish-piceous, the elytra rufescent 

 broadly toward the humeri, the abdomen faintly paler at tip and the 

 legs pale red-brown; head large, fully three-fourths as wide as the pro- 

 thorax, nearly as long as wide, the eyes moderate but convex and prom- 

 inent, at more than their own length from the base, the tempora less 

 prominent, straight and parallel for some distance, then broadly rounding 

 to the base, the carinse fine and far from entire; antenna? blackish through- 

 out, rather long, gradually distinctly incrassate, the long second and 

 third joints subequal, fourth much longer, the tenth but very little shorter, 

 than wide, the last pointed apically, not as long as the two preceding; 

 prothorax rather short, more than one-half wider than long, rather 

 widest before the middle, where the sides are broadly rounded, gradually 

 straighter basally, the base rounded, the surface not evidently impressed; 

 elytra distinctly transverse, with nearly straight diverging sides, at base 

 but slightly wider, the suture nearly a third longer, than the prothorax; 

 abdomen slightly narrower than the elytra, perfectly parallel, with nearly 

 straight sides, the fifth tergite barely longer than the fourth; middle coxae 

 narrowly separated, the very acute and slender mesosternal process not 

 extending quite to their apical third. Length 2.5 mm.; width 0.72 mm. 

 California (Siskiyou Co.). 



The antennae, having an unusually elongate fourth joint, will 

 distinguish this species readily from the two preceding, and the 

 form of the head and more prominent eyes are also peculiar 

 features. 



