332 Trara. Acad. Sci. of St. Louis. 



latter somewhat infuscate distally; pubescence rather long, suberect, 

 pale and distinct; punctuation very flae; head strongly impressed along 

 ihe middle In apical half, more deeply toward the middle of the rertex, 

 also impressed at the middle of the occiput; eyes rather well developed, 

 not very prominent; antennae evidently longer than the head and pro- 

 thorax, strongly incrassate distally; prothorax nearly one-half wider 

 than the head and two-fifths wider than long, the sides at first only 

 feebly though evidently convergent anteriorly from the base, more 

 abruptly and strongly arcuate and converging anteriorly than in the two 

 preceding species, the transverse subbasal impression distinct; elytra 

 transverse, two- fifths wider but only about a third longer than the pro- 

 thorax, the sides strongly diverging from the humeri, which are mod- 

 erately exposed at base; abdomen scarcely as wide as the elytra. 

 Length 1.35 mm.; width 0.67 mm. Virginia (Fort Monroe). 



raricolor n. sp. 

 15 — Body rather 8tout,convex, shining, very obsoletely but regularly micro-rt- 

 ticulate, pale rufo-testaceous in color, the fourth tergite black toward the 

 middle, the legs and antennae pale, the latter slender, but feebly incras- 

 sate distally and fully attaining the middle of the elytra ; pubescence long, 

 erect, rather abundant and conspicuous; head impressed at the middle 

 of the vertex as usual and feebly along the median line thence to the base, 

 the eyes prominent; prothorax moderately transverse, about a fourth 

 wider than the head, the surface with a very feeble, somewhat rounded 

 impression before the middle of the base; elytra much wider and longer 

 than the prothorax, the humeri widely exposed at base, the suture feebly 

 Impressed behind the scutelium; abdomen broad as usual. Length 

 1.68 mm.; width 0.65 mm. Delaware parricoUig Csy. 



Trichiusa appears to be a genus peculiar to the nearctic 

 regions, excepting the true Pacific coast fauna, and differs 

 greatly in general f acies from any of the European types as 

 far as known to me ; it is evidently very rich in species and 

 probably less than half have been discovered as yet. Rigida^ 

 of the above table, occurs in typical form at Vicksburg and 

 the Galveston specimens are somewhat heterogeneous, some 

 having the normally blackish-piceous prothorax, while others 

 have this part bright testaceous; these differences may be 

 sexual, at least in some degree. There is a good deal of 

 structural diversity in the genus. 



The following genera are based upon some of our more 

 conspicuous Athetoid species and are compared with European 

 species identified for me by Mr. Reitter under the names 

 Liogluta vicina Steph., L. nitidula Kr., L. subplana J. Sahl., 

 L. sexnotata Thorns., Atheta {Homalota Rey) castanoptera 

 Mann., Atheta trinotata Kr., and A. crassicornisF&h. These 



