6 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.60. 



Genus TRICHIOCAMPUS Hartig. 



Trichiocampus Haktig, Fam, Blatt-und Holzwespen, 1837, p. 176. Geno- 

 type. — {Nematus grandis Lepeletier) = (Ten^/j redo) Trichiocampus vi- 

 minalis (Fallen). 



The genus Trichio cam/pus was first recognized by Hartig, who 

 treated it as a subgenus of Cladvus^ and separated it from the other 

 groups of this genus Claudius by characters found in the antennae. 

 Westwood, in 1840/ was the first writer to treat this group as of 

 generic value, but he as well as his predecessors and successors de- 

 fined it in much the same way as it was originally defined by Hartig. 



As here defined the group is more different from the other two 

 genera of the Cladiinae than these genera are from each other. The 

 characters of the larvae and their gregarious habit together with the 

 characters of the ovipositor and legs show that this group is a natural 

 one and indicates that these characters are better than those previ- 

 ously used. 



Generic Chardcters^ Adults. — Clypeus emarginate; supraclypeal 

 area gently convex, triangular in outline; lateral supraclypeal area 

 flat ; antennal foveae small for subf amilj'^ ; inner margins of the eyes 

 parallel; anterior basitarsus distinctly shorter than the three follow- 

 ing joints (fig. 2); radiellan cell with a distinct appendage; cerci 

 short, stout; lower margin of lancets with twelve or more regular 

 teeth; the posterior margin of the plates of lancets not or only feebly 

 armed; female antenna long, slender, the third joint simple in species 

 here treated; male antenna long slender, the third joint simple or 

 strongly produced at base beneath. 



Larvae. — Characters common to the larvae studied. Head mostly 

 black (at least frons and entire dorsum from eye to eye) ; frons with 

 margin spined, median area bare; body always with black spots 

 in supraalar and epipleural regions and sometimes spotted subdor- 

 sally. Supraalar spots extending from anterior annulet B back to 

 about middle annulet C ; epipleural spots on the posterior portion of 

 the epipleural fold (figs. 49, 57-59). Uropods normal, on urites 2-7, 

 u rites 8 and 9 bare and urite 10 with postpedes. 



Adult Specific Characters. — The color, the character of the oviposi- 

 tor and the modification of the third antennal joint, in the male, offer 

 the most valuable specific characters in this genus. The shape of the 

 sheath and the emargination of the clypeus are also useful but more 

 difficult to use. 



KEY TO THE ADULTS. 



1. Females 2 



Males 4 



2. Abdomen and mesepistemm reddish-yellow; clypeus deeply emarginate. 



viminalis (Fallen). 

 Body entirely black ; clypeus more shallowly emarginate 3 



^Introduction to the Modern Classification of Insects, Synopsis, p. 54. 



