(Page 441) 

 incised, deepest in the Q . Fore-coxae are prominent and conical, the 

 middle ones narrowly separated, the hindmost shortly conical; anterior 

 femora sometimes strongly thickened, and on inner side tooth-f ormedly 

 dilated ( Lathrobium, Achenium) , tibiae most often without spines, tar- 



:?! 



si 5-jointed; fore-tarsi not infrequently dilated, especially inctbeo. 

 The sex-characters of the d , which ordinarily are found more or less 

 developed in the abdominal fifth and sixth ventral joints, affords in 

 many instances important features for the exact determination of species. 



The few larvae, which heretofore are known with certainty, (of gen- 

 era Lathrobium, Paederus , Stilicus ) adhere mainly to the larvae of group 

 Staphylinini (ianglb.). 



Heretofore about 4C Paederini species are found in this country. 



The group is sometimes divided (Iv'uls. et Key, Seidlitz) according to 



characters of tarsi and neck into several, us concerning, into three 



divisions. 



(Page 442) 



Key to (Divisions and) Gfenera. 



1. Hind-tarsal fourth joint simple and undivided 2. 



Hind-tarsal fourth joint divided into two, in Astenus membranous, 



lobes, between which the claw-joint is fastened ( Paederina :,:u1e. 

 et Rey, Seidlitz) 8' 



2. The neck almost i as broad as head, pronotum anteriorly not taper- 



ing (Lathrobiina wuls. etRey, Seidlitz) 3. 



The neck very thin, only 1/8 as broad as head, "knob-f ormed» ; pro- 

 notum anteriorly tapering forwardly ( Scopaeina ^;uls. et Rey, 



-2- 



