116 Coleopterological Notices. 



two and three times as wide as at the narrowest part, the apical 

 margin bearing two short stiff setae. 



This species appears to be distinct from any of those recently 

 described by Dr. Sharp; minor, which undoubtedly resembles it in 

 color and size, has the club of the antennae short and broad, and 

 "developed on one side only of the mesial line." 



ACYLOMIJS Sharp. 



Although bearing a certain general resemblance to Stilbus, this 

 genus possesses two characters which render it one of the most 

 remai'kable of the entire family. 



The first character is not entirely peculiar, as it reappears to a 

 less marked degree in Litochropus ; it relates to sexual modifica- 

 tions affecting the posterior tibiae. In the males these increase 

 strongly in width from base to apex ; they are obliquely truncate, 

 and have the terminal spurs extremely unequal, the smaller being 

 longer than usual in Stilbus, and the other greatly developed, being 

 sometimes between one-third and one-fourth as long as the entire 

 tibia, and generally slightly contorted toward apex. In the female 

 the tibiae are normally and sometimes unusually slender, trans- 

 versely truncate, and have the terminal spurs of the usual form, 

 although much longer, stouter and more unequal than in Stilbus. 



The other character relates to the vestiture of the under surface 

 of the second joint of the posterior tarsi, which, in the males, is of 

 a densely spongiose nature, similar to the under surface of the 

 anterior tarsi in the males of Anisodactylus. This character seems 

 to be absolutely peculiar to Acylomus, and is most highly developed 

 in the typical A. aciculatus Sharp. 



In the genus Acylomus the second joint of the posterior tarsi is 

 very much more elongate than in Stilbus, and the basal joint corre- 

 spondingly abbreviated, the connection between the two being more 

 rigid. The structure of the mesosternum is nearly similar, but its 

 extension behind the middle coxae generally less, being intermediate 

 in this respect between Stilbus and Litolibrus ; it is also a connect- 

 ing link between these two genera in the sculpture of the elytra, 

 the reticulation of the surface when present in Stilbus being coarser 

 and tending less to a transverse arrangement in wavy lines, while 

 in Litolibrus it is very much finer, taking the form of a more regu- 

 lar transverse strigilation, of such excessive minuteness and close- 



