180 
within, and Alay 8 it was still unchanged in the Oberea burrow. By 
June II, however, it had transformed to the adult, and made its 
exit from the twig on the 19th of that month. The adult has been 
captured by us repeatedly in Illinois from late July into September. 
The species is listed from New Jersey, and is said by Horn to oc- 
cur from the Middle States westward to Kansas and Texas. 
Description of Larva. — Moderately elongate with nearly paral- 
lel sides, but tapering rapidly at each end. The length of the larg- 
est specimen, 8 mm. ; its breadth, 2 mm. Pale yellowish, marked 
with dusky pink becoming purplish in alcohol, and tinged more or 
less with chestnut at the ends. Skin soft, smooth, sparsely cox-ered 
above and below with pale hairs. The head about as long as its 
breadth at the antennae, black, varied with dark chestnut above and 
below. The antennae, labrum, and inferior mouth-parts pale; the 
mandibles black, broad, acute, a tooth or tubercle on the inner edge 
near the base ; the anterior edge of the labrum broadly concave. 
Ocelli, three, equal, distance between them about half their diame- 
ters. Hairs of the head arising from pale dots. Prothorax with 
large black semicircular dorsal shield, narrow pale margins, and 
a pale median line which broadens and opens out widely behind. 
Suture between it and the head variable, blackish. The two re~ 
maining thoracic segments with black lateral margins and a U- 
shaped discal patch ; also a dark W-shaped mark in front of this ; 
some oblique lines on the mesothorax, and an irregular posterior 
border of black on the metathorax. Thoracic legs rather short and 
stout, dark dorsally, the femur with a pale annulus near the middle ; 
coxal sutures ferruginous or blackish. Abdomen 9-jointed, the 
segments, except the last, about four to six times broader than long, 
gradually lengthening from before backwards. The lateral mar- 
gins, except those of the last segment, dark. A broad median dark 
dorsal stripe about as wide as the head, and slightly more than half 
as wide as the body, ending on the base of the last segment, inter- 
rupted at the sutures and sometimes divided by a pale median line. 
Between this stripe and the lateral margin, a subdorsal stripe or con- 
fluent line of pale rounded spots, one for each segment, each with 
a black central patch connected at the posterior margin of the seg- 
ment with the dorsal stripe ; beneath yellowish except for a few 
purplish dots variably evident on the hind margins of the posterior 
segments. Last segment greenish beneath, with a prominent anal 
tubercle and a chitinous fork at the tip. Dorsal surface with a 
round black patch on the apical two thirds. The anal fork is dark 
chestnut or black, the outer sides of its prongs about parallel, but 
