516 COLEOPTERA OF NORTH AMERICA. 



coxse large, globose, prominent, and contiguous; middle coxye 

 nearly contiguous; hind coxse also. 



Legs stout, thighs thick, not toothed; tibije compressed, armed 

 with a large hook at the inner angle of the apex; outer edge 

 serrate and acute except in Micracides ; rarely flattened, with 

 two edges, between which are transverse ridges, somewhat as 

 in Platypus. Tarsi slender; fourth joint very small, but distinct; 

 fifth joint long, with large, divergent simple claws. 



Crypturgus and DolurgUs seem to us more properly placed in 

 the tribe Hylurgini. The other genera represented in our fauna 

 arrange themselves naturally into groups, according to the struc- 

 ture of the club of the antennae. 



Club large, oval, comijressed, pnl>escent, and transversely annulated on 

 both sides, sutures straight or slightly curved ; inner lace usually broadly 

 concave ; tibia serrate. Corthyi.i. 



Club large, oval, solid, pubescent on both sides ; eyes completely divided ; 

 tibiaj serrate. Xyloteku 



Club small, entirely corneous on the inner face, obliquely truncate on the 

 outer face ; truncature spongy and sensitive, marked with two concen- 

 tric lines, or transverse sutures, or entii-ely terminal and narrow ; tibiie 

 serrate. Xyleboki. 



Club large, oval or rounded, compressed, entirely corneous on the inner 

 face, more or less pubescent on the outer. face, and divided by two or 

 three sutures, which are iisually sinuated or angulated ; declivity of 

 elytra deeply concave with acute margin, usually strongly toothed; 

 funicle of antennae with five distinct joints ; tibiae coarsely serrate. 



TOMICI. 



Club elongate-oval, marked on each side by sutures which" are sometimes 

 long and curved, but sometimes nearly straight ; the basal joint corne- 

 ous, others pubescent; funicle 5-jointed ; elytra convex behind, with 

 the suture slightly prolonged ; tibite fringed with hair, but not serrate ; 

 tarsi usually with joints 1-3 rather stout, fourth very small, fifth long 

 and slender. . Micracides. 



Since the publication of the Rhynchophora of North America, 

 in which the arrangement adopted in the present work is first 

 set forth, the monograph of Tomicidte, corresponding with our 

 Tomicini has been issued by Eichhoff in the Acad. Roy. Sciences 

 Liege, mem. vol. viii., 1878. The genera are divided by Eichhoff 

 ill two sets as follows : — 



1. Maxillary lobe pilose, moi-e densely at tip ; last joint of palpi extremely 

 finely striate ; genera, Trypodendron (Xyloterus), Corthylus, Gnatho- 

 trichus, Coccotrypes, Xyleborus, Pterocyclon, 1868 (Monarthrum, 

 1866). 



