SXAPHYLINID.E. 133 



well impressed basally, about a fourth longer than the prothorax; abdomen 

 a little narrower than the elytra, parallel, feebly tapering at apex, the 

 tergites about equal in length Length 2.3 mm.; width 0.55 mm. Iowa 

 (Iowa City), Wickham. 



The type is labeled as having been found in "Nest 2, April 15, 

 1894," an d is therefore a casual inquiline. Its generic characters 

 are as in the two preceding, though otherwise there is but little re- 

 semblance. 



Synaptina disparilis n. sp. Rather slender moderately convex, shining 

 the reticulation moderate and feeble, slightly coarser and confused on the 

 abdomen, where it is more distinct apically, the vestiture and punctures 

 rather sparse, the latter fine and scarcely asperulate even on the elytra; 

 color pale piceo-rufous, the head but little darker, the abdomen blackish, 

 the legs pale; head slightly wider than long, convex, polished, the eyes 

 moderate, with rather fine separated facets, at more than their own length 

 from the base, the tempora parallel, feebly arcuate and not more prominent, 

 the carinae fine, much abbreviated; antennae pale piceous, rather short 

 but slender, gradually and feebly incrassate, the second and third joints 

 elongate, the latter almost imperceptibly the shorter, both shorter than the 

 first, the outer joints moderately transverse, the last as long as the two pre- 

 ceding; prothorax moderately transverse, parallel and broadly rounded at 

 the sides, much wider than the head, about as wide as the elytral base, un- 

 impressed; elytra only moderately transverse, with feebly diverging sides, 

 the suture two-fifths longer than the prothorax; abdomen evidently narrower 

 than the elytra, parallel, not tapering apically or extremely feebly so, the 

 fifth tergite longer than the fourth. Length 1.9 mm.; width 0.4 mm. Cali- 

 fornia (San Francisco). 



The generic characters are as in the other members so far, espe- 

 cially, as the sterna and hypomera are concerned, but the species is 

 more slender, paler in color and with peculiar form of the head and 

 structure of the eyes. It is abundant. 



In all the following genera, through Coprothassa, the hypomera 

 are still more strongly inflexed, so that they are completely invisible 

 from a lateral viewpoint, a character which distinguishes them at 

 once from Atheta or any of its subgenera. ThatAcrotona, which also 

 departs very decidedly from Atheta in general facies as well, is a 

 distinct genus, I therefore think should by no means be disputed. 



Arisota n. gen. 



In general habitus the species of this genus, which are distributed 

 from the Atlantic to the Pacific, in forms so nearly similar that they 



