346 Trans. Acad. JSci. of St. Louis. 



half of the abdomen nubilously piceous, the legs and antennae pale; 

 punctures relatively rather large, impressed, somewhat close-eet, 

 those of the elytra dense and more asperate but scarcely larger, of the 

 abdomen very fine toward base but larger, longitudinally asperate and 

 somewhat sparser toward tip; head wider than long, the eyes moder- 

 ate; antennae short and very slender, only very slightly but gradually 

 incrassate distally, about as long as the head and prothorax, the sec- 

 onl joint somewhat longer than the third, the subapical joints evi- 

 dently transverse, the last pointed and about as long as the preceding 

 two; prothorax strongly transverse, about three-fourths wider than 

 long and fully two-fifths wider than the head, the sides subparallel, 

 evenly and strongly arcuate, the basal angles obtuse and slightly 

 rounded, the surface with the merest trace of a fine short linear and 

 transverse impression before the scutellum; elytra parallel, trans- 

 verse, obviously narrower than the prothorax and of equal length, 

 with a very minute post-scutellar impression; abdomen parallel, 

 nearly as wide as the elytra, the first three tergites narrowly, rather 

 feebly and decreasingly impressed at base, the fourth wholly unim- 

 pressed. Length 1.8 mm.; width 0.43 mm. New Yorli (Catskill 

 Mts.), — H. H. Smith collaris n. sp. 



The single type is evidently a female. 



Dianusa n. gen. 



The body in this genus is very small, rather stout, the 

 middle coxae very narrowly separated, the mesosternal pro- 

 cess extending two-thirds their length, attenuate at tip and 

 nearly attaining the angular prolongation of the metasternum, 

 the infra-lateral carinae of the head complete, the eyes mod- 

 erate, not very finely faceted, the neck slender, less than 

 half as wide as the head and the hind tarsi short, with the first 

 four joints short and equal. The mentum is transverse and 

 truncate and the labial palpi shorter and stouter than in 

 Silusa. The single type may be known by the following 

 characters : — 



Body parallel, moderately convex, alutaceous, micro -reticulate through- 

 out, the reticulae of the abdomen larger and faint; color testaceous, the 

 head and the abdomen, except at apex and toward base, blackish; legs 

 and antennae pale; punctures very minute, not dense, subgranuliform, 

 more distinct on the elytra, the pubescence moderate; head trans- 

 versely elliptical, convex, rather small, the antennae short, not longer 

 than the head and prothorax, feebly and gradually incrassate dis- 

 tally, the second joint longer and thicker than the third, the subapical 

 joints transverse; prothorax short, two-fifths wider than the head and 



