AMERICAN COLEOPTERA. 



183 



labial palpi are as in Tachycellus. The anterior tarsi above dilated. 

 The middle tarsi about as slender as in the female. The antennae have 

 at most two basal joints glabrous and the second and often the first 

 are hairy. 



From the above notes it will be evident that the genera are not easily 

 separable except both sexes are at hand. The iullowing table will assist 

 the student of our fauna. 

 Antennse with two glabrous joints only. 

 Labial palpi with the terminal joint shorter than tlie preceding, the latter pluri- 

 setose in front. 

 Anterior tarsi dilated in both sexes. (The first joint only, however, in the 

 female). 

 Body pedunculate. First joint of anterior tarsus of mule not squaiimlnse be- 

 neath, the middle tarsi not dilated nor squamulose...>iteiioni«r|»lius. 

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



tarsi squamulose beneath Ciyiiaiidropus. 



Anterior tarsi dilated in the male only. 



First joint of hind tarsus not longer than the two following, elytra with at 



most one dorsal puncture Harpaliis. 



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



dorsal punctures Selenopliorus. 



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 Steiiolophus. 



Penultimate joint simply emarginate, the middle tarsi not or very feebly 

 dilated. 



Mentum not toothed. Aeupalpiis. 



Mentum toothed Bra«ljc<'llus. 



Antennae with three glabrous joints. 



Thorax without setigerous puncture in hind angle. 



Mentum toothed Tac-li.ycellus. 



Thorax with setigerous puncture in hind angle. A small mentum tooth. 



Middle tarsi simple, not dilated in male Dichirotrichus. 



Middle tarsi dilated in male. Inner angle of anterior tibite jjrolonged 



in a spine Diacliromus. 



The last two genera do not occur in our fauna and are introduced in 

 the t;il)le for convenience of comparison. I observe that the three basal 

 joints are glabrous, that is, the third joint is not punctured and pubescent 

 in the manner of the following joints. It has it is true a few hairs but 

 the surface is like the second and not the fourth. In these genera the 

 hind angle of the thorax bears a long erect seta, presenting the only 

 instance in wliich this is the ca.se in genera with one supra-orbital seta. 

 Duval refers these genera to the Anisodactyli, but from the tarsal vesti- 

 ture they seem more properly to belong here. 



As already remarked three species formerly placed in Bradycelhis 



