296 BULLETTT^r 63, UNITED STATES NATIONAL MUSEUM. 



tremely widel}^ spaced punctures, which are generally simple, but 

 which laterally toward apex become very coarse sparse asperities 

 (Casey). 



Diagnostic characters. — In tenuipes the apical angles of the pro- 

 thorax are strongly everted, the sides are quite evenlj^ arcuate; in 

 wichhami the apical angles are not everted and the sides are oblique 

 posteriori}' ; in tenuipes and in a specimen received from Professor 

 Wickham — the latter I refer to iclckhaml — the elj'tra are similar 

 and more elongateh" oval than in luca'. In the specimen of tenuipes 

 before me the eWtra are very slightly widened behind the middle and 

 this character is less evident in Wickham's specimen. In both the 

 length of the prothorax is comparatively greater as compared to the 

 width than in luca> ; the latter when well developed have the apical 

 angles of the prothorax acute and prominent anteriorly, with the 

 apex distinctly and evenly emarginate, and in the ecaudate form these 

 characters are less strongly marked. Professor Wickham's specimen 

 is of interest, combining the characters of tenuipes and wickhami. 



Some specimens of luco' have the apical angles of tlie prothorax 

 more or less strongly everted. 



In the specimens of eschsclioltzH before me the j^i'othoracic apex 

 is quite truncate and the angles are subacute and not prominent an- 

 teriorly. 



General ohservations. — The middle lobe of the mentum is moderate 

 in size, with the apex arcuate, the surface is moderately coarseh' 

 punctate and feebly scabrous, not noticeably setose. 



The prosternum is arcuately convex between the c(^xa^, and with 

 them protuberant ventrally. It is not mucronatc nor longitudinally 

 grooved in the specimen before me. 



The mesosternum is arcuately and vertically declivous, broadly and 

 moderately concave. 



The abdominal intercoxal salient is quadrate and about a third of 

 its length shorter than the post-coxal portion of the segment, the lat- 

 ter being slightly shorter than the second, which is about a fourth 

 longer than the third, the latter being less than twice as long as the 

 fourth. 



The abdominal salient is about a sixth of its width wider than the 

 metastei'nal process. 



The metasternum laterally between the coxw is about as long as the 

 width of a mesofemur at base. 



The tibial grooves of the femora ai'e well defined by cariniform 

 margins, the floors are glabrous and shining, and nearly plane. Those 

 of the profemora are moderately wide and nearly attain the femoral 

 base; the margins are scarcely arcuate and gradually converge to the 

 base, where they become contiguous; the anterior margins are acutely 

 and dentately laminate at the apical fourth. On the mesofemora the 



