370 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
li». Black LOCUST saw-fly. 
XrnHituM robinia Forbes. 
Prom a number of saw-fly larva' found infesting the black locust 
(Robinia pseudacacia) at Normal, we bred during the latter part of 
July a small saw-lly related to Nematus birittatus and aureopectus, 
but apparently undescribed The larva from which this specimen 
was bred entered the ground July 8, emerging on the 26th. (Forbes' 
Third Rep. Ins. Illinois.) 
Adult. — Body stout, pale brownish yellow ; mesothorax with a black vitta upon 
each side; metathorax with a transverse black band continuous with the posterior 
extremities of the mesothoracic stripes; tergum blackish, with the sides and pos- 
terior margins of the segments of the general color; prothorax between the ends of 
the mesothoracic stripes a little darker brown ; head slightly darker than the body, 
with a quadrate black spot upon the occiput, extending forward to include the 
ocelli. This area is slightly shining, but the adjacent surfaces of the head are dull, 
punctured, and rather densely' pubescent. Antenna} longer than the head and body, 
third and fourth joints equal ; clypeus emargiuate in front. The under parts and 
legs are uniform pale yellow brown, except the tibiae and tarsi of the posterior pair, 
which are dusky, and the genital valves of the female, which are black. Wings 
hyaline, veins fuscous, costa and stigmata yellowish, second submarginal cell slightly 
angled at the recurrent nervules, of which there are two about equally removed 
from the two extremities of the cell. First submarginal quadrate, distinct ; pos- 
terior margin of wing behind the lanceolate cell slightly tinged with yellowish. 
Length of body, 4 mm ; expanse, 10 m,n . Described from a single female. (Forbes.) 
20. Partheno8 nubilis Hiibner. 
Dr. Harris has raised the moth from the caterpillar which in Sep- 
tember is found hiding itself in holes of the trunk of the locust, going 
out at night to eat the leaves ; the pupa was found in a loose web on 
the surface of the ground ; the moth appeared June 18. 
Larva. — First pair of abdominal legs rather smaller than the others, and rarely 
used in creeping or resting. Color, brown above, finely dotted and variegated with 
dark brown ; body beneath pale brown, with a black spot between the prolegs, and 
a blackish streak beneath the last three segments. Two zigzag brown lines (almost 
black posteriorly) form a series of lozenges along the back, one lozenge being on 
each segment, and becoming gradually narrow behind. Each lozenge, especially 
those of the hinder segments, has a black spot near the hind angle. A pale line on 
each side below, and contiguous to the spiracles, and in young specimens a dark- 
brown line above the spiracles. The latter are black. Head round, dark brown, but 
spotted with pale points in clusters. Top of first segment marked with a semi-circular, 
darker, but not horny spot. Legs pale brown as the belly. (Harris Corr., 320.) 
Moth.— Head rather small, thorax dark ashen, a black line in front, strongly tutted 
behind; abdomen dark gray above, lighter below, strongly keeled dorsally ; fore- 
wings pointed, deeply scalloped outwardly, much rounded; color dark ashen ; basal 
and transverse anterior lines distinct, geminate ; transverse posterior line obsolete; 
beyond, a submarginal line, slender, much angulated ; a blackish, somewhat trian- 
gular apical dash present; reniform spot large, bounded on each side by a light band, 
starting from the costa, the outer reaching to the outer third, the inner parallel, 
reaching to the inner margin ; these are often nearly white, and coalesce behind the 
reniform spot ; subreniform obsolete; hind wings bright yellow, with two median 
black bands, irregularly waved, parallel; discal luuule within strongly marked; 
marginal band toothed on both sides; fringe yellowish. Expands 50 to 70 mm . 
Occurs throughout the Eastern States and in Colorado. (Hulst.) 
