104 GEO. H. HORN, M. D. 



abdomen may be narrowly pale at apex, or the greater part of the 

 last three segments pale. The apical pale border of the elytra is at 

 times indistinct, in its best development it never exceeds an eighth 

 of the length of the sntnre. 



P'rom.an examination of the ty])e of socer it seems to be an acci- 

 dental cervicalis, with the middle third of the base of the thorax 

 piceous. 



Hab. — Canada, New Jersey, North Carolina, Georgia, Missouri. 



S. abbreviatus Lee. -Oval, very little longer than broad, entirely black, 

 legs red. Head moderately, coarsely and closely punctate. Thorax narrower in 

 front, sides very little arcuate, basal marginal line distinct, but tine; surface 

 sparsely punctate at middle, much more closely at the sides. Elytra coarsely and 

 moderately closely punctate ; prosternal elevated lines distinct, slightly convergent 

 in front; metasternum closely punctate at sides, the mesocoxal arc joining the 

 suture one-fourth from the front angle. Abdomen more finely, but densely punc- 

 tate, metacoxal arc entire very little longer than half the first segment. Length 

 .08 inch. ; 2 mm. 



This species resembles tenebrosm, but the upper surface is more 

 coarsely and closely punctate. They differ more especially in the 

 extent of the metacoxal arc, which here is short, but in te)hebwsiis 

 nearly as long as the segment. 



Hab. — Lake Superior region. Two females in the LeConte cabinet. 



S. iiiai'giiiicolli!^ Mann.— Broadly oval, outline continuous, black, head 

 often (especially in male) and sides of thorax reddish yellow. Head finely, 

 sparsely j)unctate. Thorax slightly narrowed in front, sides feebly arcuate, sur- 

 face punctate, more closely at sides, basal marginal line distinct. Elytra moder- 

 ately closely punctate ; prosternal carinae convergent and entire ; metasternum 

 coarsely and closely punctate, the mesocoxal line arcuate, joining the suture near 

 the front angle. Abdomen closely coarsely punctate, the metacoxal arc entire 

 very nearly as long as the first segment. Legs nearly black, the anterior some- 

 times more or less rufous. Length .06— .08 inch. ; 1.5 — 2 mm. 



The male has the fifth ventral feebly emarginate as usual in the 

 genus. At the middle of the posteri(jr margin of the first ventral 

 segment is a small tubercle with very small hairs. 



This species varies in the coloration of the head and thorax. The 

 head may be either red or black, in the former case nearly all are 

 males, although some females are similarly colored. The thorax is 

 usually yellow at the sides in a variable extent, sometimes the me- 

 dian dark space is reduced to a narrow strip along the middle of the 

 base. Others again have the entire thorax black. These are not 

 readily separable from lacmirb^ by description, except in the male. 



