256 BRACHELYTRA — STAPHYLINIDAE. 



the base of segments 2 to 5 and a rather broad band at the 

 base of the two penultmiate dorsal and all the ventral seg- 

 ments of ashy-gi'ay pubescence, visible only when the 

 abdomen is fully extended ; legs red-brown. L. 5 — 5| 1. 

 Hare. S. latehricola, Gr. 



b. Head roundish quadrangular. 



I, Scutellum covered with golden-yellow pubescence. 



Dull. Head, thorax and abdomen black ; palpi, base 

 and apex of antennae and legs red ; forehead between eyes 

 and a triangular spot on each side of second, fifth and 

 sixth abdominal segments with yellow pubescence. L. 

 5 — G 1. Itather common. S. erythropterus, Lin. 



II, Scutellum covered with black pubescence. 



Dull. Head, thorax and abdomen black ; base of an- 

 tennae and legs red ; forehead Ijetween eyes, anterior angles 

 and basal margin of thorax, apical margin of second abdo- 

 minal segment and a more triangular spot on each side of 

 the following dorsal and ventral segments covered with 

 golden-yellow pul^escence. L. 6 — 7 1. Common. 



S. caesareus, Ceder. 



0('j/2)tfs. 



A, Mandiljles with a tooth in the middle. 

 a. Last joint of labial palpi cylindrical. 

 J. Head and thorax black or dark blue. 



7. Winged; elytra about equal in lengtli to thorax. 

 A A. Fore parts deep dull black. 

 Abdomen deep black ; antennae usually rust-brown at 

 apex. Punctuation and pubescence very fine. L. 11 — 14 1. 

 Counnon. 0. olens, Mlill. 



B B. Fore parts dark blue, rather dull. 

 Abdomen lilack; antennae and legs black, former brownish 

 at apex. L. 7—10 1. Very rare. 0. cyaneus, Payk. 



2, Apterous ; elytra distinctly shorter than thorax. 

 A A. Legs black. 

 Black, didlish. Thorax one-fourth longer than elytra, 

 with a smooth central line. L. G— 9 1. Kather common. 



0. similis, Fab. 



