818 The American Naturalist. [September, 
PvROCHROA FLABELATA Fabr. Plate XXVI, figs. 2, a, b, c, d, e, f. 
Color of full-grown larva clear, light yellow, the head, especially the 
mouth parts, and theterminal processes castaneous. 
Form elongate, much depressed, sides sub-parallel, slightly broader be- 
hind, segments with dorso- and ventro-lateral bristles. "Terminal seg- 
ment corneous with two stout processes directed upward and backward. 
Length 34.5 mm. 
Head corneous, free, the sides strongly rounded, front produced at 
middle, labrum distinct, tip sinuate more prominent at middle, anterior 
margin strongly bristled, suture very slightly sinuate. Top of head 
with a depressed space surrounding a large tubercle, anteriorly with 
transverse striations and two tolerably distinct longitudinal lines. 
Eyes consist of four ocelli on each side of the head, just posterior to 
the antenne. The three anterior ones in each group are arranged in 
a slightly oblique curved line, back of the middle of which the fourth 
is placed. 
Antenne lateral, situated behind the base of the mandibles, four- 
jointed, the first joint stout, short, the second long, third and fourth 
subequal, together somewhat longer than the second. The fourth joint 
is much more slender than the third, and all are strongly bristled. 
Mandibles extremely stout and heavy, deep, the tip emarginate, inter- 
nally strongly toothed, as shown by the drawing. 
Maxillz large, strong corneous ; the lobe is sinuate on the inner mar- 
gin and armed with bristles, those near the end arrayed in rows, the 
inner apical ones recurved. The palpi are stout, the second and 
third joints about equal and separately longer than the first; all are 
ristly. 
Mentum of the form shown in fig. 2 f£. The shaded portion is 
thicker and more perfectly chitinized than the remainder, and has 
every appearance of being divided by sutures from the underlying and 
superimposed pieces. 
Prothorax about equal in width to the head, the sides nearly straight, 
except at the angles, where they are abruptly directed inwards. Median 
line distinet with a fovea each side anterior to the middle and crossed 
in front of these by a fine transverse line. Beneath with two strongly 
impressed lines which, originating between the coxæ, diverge strongly 
in front and attain the margin near the anterior angles, the triangular 
space thus enclosed being also bistriate at middle. 
Mesothorax broadest near the base, more convex than the prothorax, 
with distinct median line, and, on each side of this, a vague double fovea, 
es 
