Dec. x8 9 6 .] Packard: Transformations of Hymenoptera. 159 
acutely so, so that dorsally there are subacute extensions of the thick¬ 
ened posterior portion. The terminal segments cylindrical, less con¬ 
vex, the terminal or tenth ring cylindrical, not flattened, large and 
full. Beneath, the rings are very convex. The pleural region not very 
distinctly marked. Color a beautiful roseate tint. Head long and as 
narrow as usual, though no more so; full and convex; supra-clypeal 
piece large, subtriangular, indistinctly marked. Antennal fossa rudi¬ 
mentary ; placed rather farther back, or rather the clypeus is so much 
shorter than usual as to give it the appearance of being situated farther 
back. Clypeus short and broad, transversely oblong, base convex, 
front edge a little concave, as broad as the base; the sides parallel, 
acutely convex. Labrum large chitinous, transparent, as broad as the 
clypeus, bilobate, with a distinct median line. Mandibles rather slen¬ 
der, long, incurved, very acute. Maxillae cylindrical, 2-jointed, tip or 
rudiment of the palpi minute. Labium much as usual, flattened, cylin¬ 
drical, ending in a transverse chitinous line, being the rudiment of the 
lingua? on each side of which are the minute rudiments of the palpi. 
Described from living specimens. 
Pupa .—Head full, convex in front, much as in the adult; ocelli 
prominent; papillae acute. Antennae folded over the base of the nar¬ 
row, acute, curved, prominent mandibles as described in Cemonus, and 
reaching to the first pair of trochanters. Lingua much shorter than in 
Cemonus ; the palpi very small and slender. The fore legs are very 
slender, the tarsi just reaching to the middle trochanters, while the hind 
tarsi reach to the middle of the abdomen. The ovipositor is exserted, 
the wings covering the middle tibiae and femora. Length, .15 inch. 
It differs from Cemonus in generic characters observed in the imago. 
The palpi are much smaller ; lingua and maxillae much shorter, and 
mouth-parts generally much weaker. The head is more ovate, full and 
convex in front, where it is sunken and depressed in Cemonus. The 
antennae are much slenderer, and the abdomen longer and slenderer, 
as the hind legs scarcely reach to the middle, where in Cemonus they 
pass beyond. The mandibles are much more slender, their tips being 
more acute. 
Cemonus inornatus {Say'). 
Larva .—Body oblong, long, and greatly flattened, the lateral 
ridges of that segment very large, broadly triangular, becoming larger 
and more pointed towards the end of the body. The body does not 
narrow any until the nth segment, when it suddenly tapers off. Above# 
