148 Annals Entomological Society of America (Vol. VIII, 
usually disappeared after the second season. No trace has been 
found of other insects or of fungus in the openings thus made, 
and since the ovipositor of the insect seldom penetrates the wood 
there is no trace of the incision below the bark. A careful com- 
parison of trees in the field has led to the conclusion that those on 
which the membracids were numerous were in no way less sturdy 
than those on which no membracids were found. 
TECHNICAL DESCRIPTIONS. 
Egg: 
Measurements: Average length 2.6 mm.; average greatest width 
.6 mm. 
Club-shaped. Smooth, without sculpturing. Translucent white 
with pointed end opaque white. Neck gradually acute. Chorion vit- 
reous. Cap comparatively large, somewhat wrinkled. Micropylar 
apparatus opaque and white. 
First instar: 
Measurements: Length 1.8 mm.; maximum width .2 mm. 
White, with brown head and brown dorsal spots; dorsal surface 
decorated with prominent bristles. : 
Head broad, flat, brown, covered with long bristles; constriction 
between head and thorax deep; eyes prominent, centers blood-red; 
antennz colorless, well developed; clypeus white; beak white and 
extending almost to tip of abdomen; ferruginous maxillary and man- 
dibular sete visible. Prothorax prominent, brown, tuft of three paired 
bristles on median dorsal line, one pair of very fine bristles anterior to 
this tuft and a single bristle on each side below it. Mesothorax white 
with brown lateral patch on each side near dorsum, one heavy branched 
bristle on each side median dorsal line with fine lateral bristle below it. 
Metathorax white, four fine unbranched dorsal bristles. Abdomen with 
eight visible segments, brown above, white below, fifth and sixth seg- 
ments white throughout, seventh and eighth segments brown above 
and white below, each of first six abdominal segments bearing above 
a pair of heavy branched spines suddenly acuminate in a fine bristle 
and two rows of fine lateral hairs, seventh and eighth segments with a 
pair of fine unbranched bristles on each side dorsal line, underside of 
abdomen white and sparsely pilose, anal tube protruding. Legs and 
feet entirely white, femora and tibiz hairy. The above description from 
a specimen killed and described immediately on its emergence from 
the egg. 
Second instar: 
Measurements: Length 2—2.8 mm.; maximum width 1 mm. 
Entirely light chocolate brown except undersurface of abdomen 
which is white; body very finely punctate with white. 
Head finely pilose; dorso-cephalic part produced into two tuberos- 
ities; beak heavy and extending almost to extremity of abdomen. 
