l.H NORTH AMERICAN 



Prothorax longer than wide ; antennae long and slender ; abdomen 

 nearly black, border not vertical, much less strong, thicker, not 



gradually diminishing posteriorly 4. gracilicoriiis. 



Head wider than the prothorax which is trapezoidal ; sides of pronutum 

 sinuate ; femora generally slender. 

 Penultimate joint of the antennae longer than wide...."). breTipeililis. 

 Penultimate joint wider than loug. 



Antennal joints 7-10 wider than long; epistoma transversely truncate 



anteriorly 6. aiialis. 



Antennae very mucli shorter and more robust, joints 5—10 wider than 

 long ; epistoma strongly arcuate anteriorly, semicircular. 



7. stilicoides. 



For synonymy tlie student is referred to the above-mentioned notes 

 by Dr. LeConte except tor the iiutliorship of splicericollis, which is 

 due to Say and not to Ericiison. 



1. A. 1>icolor n. sp. — Form moderately robust, depressed, widest across 

 the aluiomen. Pubescence sparse, semi-erect, fine and very inconspicuous. 

 Color of head piceous, almost black, under surface somewhat paler ; abdomen 

 intense black above, dark piceo-fuscous beneath ; remainder of the body, legs 

 and base of the antennae pale testaceous, antennae infuscate toward tip. 

 Head moderate, depressed ; sides feebly convergent and rather strongly 

 arcuate behind the eyes ; truncate behind ; eyes very small, coarsely granu- 

 lated, moderately pro^iinent, situated at more than twice their length from 

 the posterior angles ; interocular surface polished, not punctate ; supra- 

 anteunal tuberculations very prominent, elongated, nearly parallel ; an- 

 tennae slightly longer than the head and prothorax together, all the joints 

 longer than wide, very minutely pubescent, basal joint not as long as the 

 next two together, outer joints twice as robust as the second, eleventii much 

 shorter than the two preceding together ; labrura broadly and deeply emar- 

 ginate anteriorly where it is densely ciliate, testaceous in color. Prothorax 

 slightly wider than long, widest at the middle where it is equal in width to 

 the head ; sides evenly and strongly arcuate ; base just visibly shorter than 

 the apex, the former feebly sinuate, the latter very broadly and rather feebly 

 arcuate ; apical angles broadly rounded, posterior very obtuse and but 

 slightly rounded ; disk very convex, not setose, polished, not punctate. 

 Elytra at base just percej)til)ly wider than the head ; sides extremely feebly 

 divergent posteriorly, sliglitly shorter than the width at base, very feebly 

 arcuate; together very broadly and feebly emargiuate behind; suture and 

 scutellum together distinctly longer than the pronotum ; disk very de- 

 pressed, shining, impunotate. Scuteliuui rather large, triangular, slightly 

 wider than loug, disk minutely rugulose. Abdominal segments increasing 

 in width to the fourth, first at base slightly narrower than the contiguous 

 elytra, fourth much wider, equal in width to the fifth ; surface very depressed, 

 polished, minutely reticulated, impunctate ; border very strong, nearly erect 

 on tin; first five segments, abruptly very narrow and inconspicuous on the 

 remainder, sparsely herissate toward the tip with coarse piceous setae. Legs 

 rather long, testaceous thioughout ; femora somewhat robust, tibiae very 



