56 COLEOPTERA OF NORTH AMERICA. 



The genera are not easily separable, unless both sexes are at 

 hand. . The following- table is the best we can devise for those 

 represented in our fauna. 



Antennse with two glabrous joints only. 



Labial palpi with the terminal joint shorter than the preceding, the 

 latter plurisetose in front. 

 Anterior tarsi dilated in both sexes ; the first joint only, however, in 

 the female. 

 Body pedunculate. First joint of anterior tarsus of male not squa- 

 mulose beneath, the middle tarsi not dilated nor squamulose. 



Stenomorphus. 

 Body not pedunculate. First four joints of anterior and also of the 

 middle tarsi squamulose beneath. Gynandropus. 



Anterior tarsi dilated in the male only. 



First joint of hind tarsus not longer than the tvvo following, elytra 

 with at most one dorsal puncture, Harpalus. 



First joint of hind tarsus equal to the next three, elytra with 

 three series of dorsal punctures. Selenophorus. 



Labial palpi with the terminal joint equal to or even a little longer 

 than the preceding, which is bisetose only. 

 Penultimate joint of anterior and middle tarsi of male bilobed, 

 the middle tarsi dilated. Stenolophus. 



Penultimate joint simply emarginate, the middle tarsi not or 

 very feebly dilated. 

 Mentum not toothed. Acupalpus. 



Mentum toothed. Bradycellus. 



Antennae with three glabrous joints. 



Thorax without setigerous puncture in hind -angle. 



Mentum toothed. Tachycellus. 



Of these genera Harpalus, Stenolophus Acupalpus and Bra- 

 dycellus are represented on both sides of the continent ; Steno- 

 morphus is tropica], extending into Texas and Arizona; Agao- 

 soma Mann, is synonymous ; Gynandropus is peculiar to Atlantic 

 North America. 



Group III. — Anisodactyli. 



The essential character of this group is that the dilated tarsal 

 joints of the male are spongy pubescent beneath. 



The genus Anisodactylus not only gives its name to the group 

 but is also its central idea. From this, as a starting point, the 

 relative values of the genera may be discussed, as a convenient 

 point of comparison. 



In a review of our species of the genus, published by Dr. Horn 

 (Proc. Amer. Philos, Soc, 1880, p. 162, etc ), will be found a 



