234 Trans. Acad. Set. of St. Louis. 



though they are probably less vestigial than in Stilicopsis. 

 Like the latter genus Stamnoderus occurs also in Central 

 America. Monsirosus was originally assigned to Sunius. 



SUNII. 



This group or subtribe consists for the most part of the 

 single genus Sunius, one of the most widely distributed and 

 characteristic Paederid genera of the palaearctic and nearctic 

 regions of the world. There are a few other genera, especially 

 some peculiar to the neotropical regions, but none other ap- 

 pears to enter the fauna of America. In some features, 

 such as the structure of the tarsi, antennae and the general 

 habitus of certain forms, it apparently makes a closer ap- 

 proach to the Pinophilini than any other type of the Paede- 

 rini, but it can be stated quite positively that any such re- 

 semblances are merely superficial and fortuitous, for in the 

 structure of the prosternum, palpi, form of the head above 

 and beneath and many other characters these two types of 

 Staphylinidae are so widely separated as to indicate little or 

 no phylogenetic relationship. The three genera which happen 

 to be represented by material in my cabinet may be described 

 as follows : — 



Labrum quadridentate, advanced and arcuate toward the middle, the teeth 

 broad and very strong, the median very much longer and more advanced 

 than the outer and each bearing a short stiff tactile seta laterally 

 near its acute apex, the outer teeth acute and nude; prosternum 

 transversely and broadly tumid, finely, longitudinally and rather feebly 

 carinate, the carina not crossing the transverse concavity just behind 

 the apical margin; hind tarsi almost as long as the tibiae, slender, the 

 basal joint about half as long as the remainder taken together; head as 

 in Sunius; eyes smooth, the facets not convex; sculpture throughout 



very coarsely but not densely, simply punctate. Europe * Nazeris 



Labrum bidentate ; eyes not smooth, each of the individual facets convex. . 2 

 2 — Labrum very short, broadly truncate, having a small median emargina- 

 tion, at each side of v?hich there is a short tooth in the form of a slender 

 truncated cone, a very small stiff tactile seta projecting axially from its 

 extremity, the edge just without each tooth broadly and arcuately lobed ; 

 prosternum thrown up in an acute transverse ridge at some distance 

 from the apical margin and separated therefrom by a narrow deep con- 

 cavity, the median line with a fine but acutely elevated, somewhat un- 

 even carina, which crosses the anterior concavity and attains the apical 



