HO NORTH AMERICAN 



C'alil'oriiia and Arizona. 



The jrenera in tlii,< portion of the Harpalini may be distinguished 

 as follows: — 



Mentum tooth very long and slender, as long as or longer than the lateral 



lohes of the mentum Amerinus. 



Mentum tooth short, much shorter than the lateral lohes of the mentum. 



Antennae with two glabrous joints Bradycellus. 



Antennae with three glabrous joints. 



Pronotum having but one lateral seta '. ...Tachycellus. 



Pronotum having many lateral setae Glycerius. 



Mentum not toothed Acupalpus. 



As additional cliaracters we may mention tlic facts observed by 

 Dr. Horn, that the under surface of the middle tarsi in the male is 

 provided witli squamnles in Amerinus and devoid of squamules in 

 liradycelhis, and tliat in Bradycellus there is usually but one pubes- 

 cent spot in the middle of the second ventral sejiment, there being 

 two in Glycerius and none in Tachycellus. Dr. LeConte has, in 

 addition, made known the fact in regard to Glycerius iiitidus, that 

 " traces of a long .scutellar stria are apparent in some specimens of 

 this species, which thus differs from all the otliers [Bradycellus] in 

 which tlie midille tarsi of the male are not fnrnislied witli papillae." 

 (Proc. Ac. Phil. 18(j8, j). o.Sl). I have not attempted to coniirm any 

 of tliese stateinenls, ami they are sim[>ly given as published by the 

 above-mentioned authors. 



BIDESSrS Sharp. 



B. ni^rimis n. sp. — Form rather elongated, depressed. Pubescence 

 excessively sparse, fine, and very short, very inconspicuous; integuments 

 polished ; color above black, head, lateral portions of the pronotum piceo- 

 testaceous, also very slightly paler at the borders of the elytra toward the 

 humeri ; under surface black, prosternum and head paler ; antennae intense 

 black, glabrous, slightly i)aler piceo-testaceous toward base. Head scarcely 

 twice as wide as long, strongly arcuate anteriorly ; surface very feebly con- 

 vex, very minutely, sparsely, and irregularly punctate, more strongly so 

 posteriorly ; eyes large, not at all prominent ; antennae as long as the head 

 and pronotum together, second joint much longer than the first, both slightly 

 more robust than the third, remaining joints slightly flattened, third nearly 

 two-thirds longer than wide, two-thirds longer than the fourth, and very 

 slightly longer than the fifth, fourth very slightly wider than long, eleventh 

 as long as the two i)receding together and narrower, very thin, finely acumi- 

 nate, cylindrical. Prothorax vjder tiian the head, about two and one-third 

 times wider than its medial length ; sides scarcely visibly convergent from 

 the basal to the apical angles, and slightly arcuate throughout ; apex broadly 

 and strongly emarginate throngiiout for the basal ])<)rtions of the head, 



