AMERICAN COLEOPTERA. 181 



This genus occurs in Brazil and is introduced here as it shows some 

 relation with Discoderus of the preceding group while plainly a member 

 of the present. 



AciNOPUS. — Palpi normal. In both sexes the anterior and middle 

 tarsi are dilated, and in the males biseriately squamulose beneath. 



In this genus was first observed the difference between the right 

 and left mandible of the male to which I have called attention in 

 Cratacanthus. It occurs in Europe and is mentioned as one of the 

 links between the present group and the Dapti. 



Harpalus. — Palpi normal. In the male the anterior and middle 

 tarsi are dilated and biseriately squamulose beneath, the fourth joint 

 emargiuate or subbilobed. In the female the tarsi are slender. The 

 posterior tarsi have the first joint never longer than the next two. The 

 elytra have one dorsal puncture or none. Paraglossae ciliate at tip. 



Selexophorus. — Palpi normal. Sexual characters of //^»r/;^</i<.s. First 

 joint of hind tarsus e(puil to the next three. Elytra with three rows of 

 dorsal punctures. Paraglossae with at most one cilia at the sides. 



A review of the species of our fauna will be found in Proc. Amer. 

 Philos. 8oc. 1880, p. 178. 



Stenolophus. — Palpi abnormal, the last joint of the labial oval, 

 acuminate, the penultimate bisetpse in front. Anterior tarsi of male 

 with four joints dilated and biseriately S(juamulose beneath, the ftmrth 

 joint deeply bilobed, middle tarsi moderately dilated and squamulose. 

 First joint of hind tarsi about as long as the two following together. 

 The females have the tarsi slender, the fourth joint of the anterior 

 pair emargiuate. 



In the above genus will be contained those species in our fauna 

 included by Dr. LeConte in his divisions A, B, D, (Proc. Acad. 1868, 

 p. ?)~(i). It will be observed that the last joint of the labial palpi is 

 more slender and less oval than in the species of his group C. I have 

 also observed that in some species this same joint is impressed or concave 

 beneath in the male, (/imbttlis,f(tli(jinosus, conjunctus, anceps, cincticolh's, 

 Jiavlpea and ochropezus), in others it is entirely simple, {ccnbonarhts, 

 plebejus and tfissimi/is). Several have not been examined as males are 

 not at hand. In souie species also the hind tarsi have a tine carina on 

 the outer side of the first three joints. The middle tarsi are sometimes 

 sulcate as in P/afi/mis. I mention these observations that they may be 

 made use of by future students of the genus. 



AcuPALPUS. — Palpi abnormal, the terminal joint of the labial rather 

 stoutly oval but slender at tip. the penultimate bisetose in front. Ante- 



(41) 



