AMERICAN COLEOPTERA. 119 



Dectes is also added to the group as its characters do not warrant 

 a wider separation. 



The genera now known are as follows : 



Thorax feebly tuberculate or angulate at the sides a little behind the middle. 

 Mesosternum broad, first joint of hind tarsi not longer, if as long, 



as the next two Iieptostylii$>l. 



Thorax distinctly angulate, usually acutely tuberculate, or with a short spiue 

 behind the middle. Mesosternum triangular or narrow. 

 Antennae without traces of cilise beneath, first joint of hind tarsus as long 

 as the next two. 



Prosternuni narrow but not linear, body without erect hairs Ijiopas. 



Presternum linear, form cylindrical, elytra with erect hairs Dectes. 



Antennae distinctly ciliate beneath. 



Hind tarsi short, first joint not as long as 2 — 3. Antennje % very long, 



the fourth joint longer than the entire body Itlecotetartus. 



Hind tarsi slender, first joint as long as the next three. Antennaa normal. 

 Pro- and mesosternum very narrow. 



Elytra without lateral carina LieptlirgeS. 



Elytra with distinct lateral carina Hyperplatys. 



L,EPTOSTYL,US Lee. 



Under the remarks on Liopus I have given what seem to be the 

 only characters separating these two genera. Among the species 

 several characters have been observed which will serve to group them 

 in a very natural manner. 



In the male pf L. Palmeri as observed by Dr. Leconte, the sixth 

 joint of the antenna is prolonged inwards at the tip after the manner 

 of our species of Acanthocinus. The pubescence of its surface is 

 very fine and without trace of erect hairs. The elytra are not at all 

 roughened and the punctuation coarse but very sparse, their apices 

 obtuse. The legs are so very finely pubescent that they may be 

 described as nearly naked, the tarsi are short and broad and finally 

 the thorax is angulate at middle so that its form is hexagonal, re- 

 sembling Lagocliirus, without however being as strongly angulate as 

 in that genus. That it is not a Lejdoati/lus seems to me very evident 

 from its characters, facies and size, and the only course is its removal 

 from the genus to form a new one near Lagochirus. 



L. albidus Lee, is remarkable in being the only species with short, 

 erect pale hairs on the elytra. The legs are also fimbriate, the femora 

 as well as the tibiae and the antenna? are ciliate beneath on the first 

 four joints. According to the table given by Lacordaire this species 

 would form a new genus neir Probatius Thorns., but its general re- 

 semblance to L. hmstus Lee, is such that I retain it here in preference 

 to increasing the already too numerous genera of Cerambycidae. 



