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when the pupe are matured. The head is bent against the breast, 
and the legs folded against the body beneath, the posterior pair 
being applied against the sides of the abdomen, and the thighs of 
the two anterior pairs projecting at right angles. The wing covers 
are wrapped around the posterior pair of legs, and the antenne 
embrace the knees of the two anterior pairs. 
The front of the head is set with a few long spines with inflated 
bases, and three transverse rows of similar spines appear upon the 
thorax, one near the anterior border, another near the posterior, 
and the third intermediate. Six similar hairs occur upon the scutel- 
lum, and a row of about six or eight boiders each of the ab- 
dominal segments above. The three last segments are variously 
armed with spines, differing in shape and direction according to the 
genus; and the knees of the last pair of legs are furnished with 
stout hooks and long slender hairs with inflated bases. The sheaths 
of the antenue are beset externally with conical tubercles. 
Adults.—The adult beetles all belong to the great family Chryso- 
melide, which contains many of the most destructive enemies of 
agriculture, and to the group Humolpini. As defined by Leconte 
and Horn in their recent revision of the “Classification of the Coleop- 
tera of North America,” this group is thus distinguished: ‘Body 
oblong, convex, rarely rounded or oval, usually metallic, sometimes 
testaceous or spotted. Head moderate, deflexed, front wide, eyes 
more or less emarginate; antenne filiform, or slightly thicker ex- 
ternally, usually long; widely separated at the base. Prothorax 
generally with distinct lateral margin, which is, however, rarely 
effaced. Pygidium covered by the elytra, which are rounded at tip. 
Front coxe separated by the prosternum, globose, cavities closed 
behind. Legs moderate, the front ones sometimes elongated ; tarsi 
broad, third joint deeply bilobed, claws appendiculate or bifid in our 
genera.” 
DIFFERENTIAL CHARACTERS. 
As may be inferred from the fact that these root-worms all belong 
to the same tribe of their family, the characters which distinguish 
them in their immature stages are few and trivial. The adult 
beetles, belonging to separate genera, may be discriminated without 
difficulty; but the larvae of Scelodonta and Paria especially, are 
almost indistinguishable. 
By an attentive examination, the larve of Colaspis may be easily 
separated from the others, by the decided prominence of the two 
rows of tubercles at the ends of the ventral ridges, (Plate IX, Fig. 4, EK, a, 
and b), by the strong spine-like hairs which these tubercles bear, 
and also by the peculiar character of the posterior segments beneath 
(Plate IX, Fig. 4, H, 12and13). In Seelodonta and Paria the eleventh 
and twelfth segments are similar to the preceding in structure, except 
that they are decidedly shorter, and the tubercles upon their dorsal 
arches are much more prominent. Each makes, however, a com- 
plete ring, encircling the abdomen, and the rudimentary thirteenth 
segment is scarcely more than a soft papilla containing the vent. 
But in the larva of Colaspis, the twelfth ventral segment is deeply 
and widely emarginate posteriorly, divided, in fact, into two triangu- 
—11 
