73 
antenne are nine-jointed, filiform, reaching the base of the thorax, 
rather stout, slightly serrate, and somewhat ferruginous beneath; 
the third joint longest, the fourth and fifth equal. The eyes are 
prominent, the mandibles short and wide, with one inner tooth. The 
maxillary palpi are long and slender, the first joint minute, the 
apical joint shorter than those before it; the first and second joints 
of the labial palpi shortest. The abdomen is rather iong, cylindri- 
cal in the males and carinate in the females, and suddenly com- 
pressed at the apex. Nasus, labrum, tegule and edge of collar 
whitish; a brownish interrupted band on each segment of tergum; 
legs varying from reddish-brown to white, their coxe, except at the 
tip, the femora of the four anterior legs beneath, apical joints of 
their tarsi, the femora of the posterior legs, apical half of tibis, and 
their tarsi, except base of basal joints, black; inner claw tooth 
short; wings hyaline, faintly clouded. The male has the antenn» 
much flattened and brown beneath; the bands on abdomen whitish ; 
legs with less of black, coxe and posterior femora above black. The 
length varies from two-tenths to twenty-two hundredths of an ineh, 
and the expanse of the wings from forty-two to forty-seven hun- 
dredths. 
Egg.—The egg is said by Prof. Riley to be white, opaque, and 
three-hundredths of an inch long. 
Larva.—The larva, when full-grown, is from six-tenths to sixty- 
five hundredths of an inch in length, varying in color from pale 
greenish to dirty vellow, with a faint whitish bloom along the dorsal 
and sub-dorsal regions, inclining, in most cases, to deep blue-green 
on the thoracic segments. There is a broken band along each side, 
of a deeper shade of green, composed of spots or patches which 
coalesce on the anterior segments, but are distinct and separate 
behind; below the bands the body is paler, with a faint yellowish 
tint. Under surface, pale yellowish and semi-transparent; feet and 
prolegs—of which latter there are eight pairs—all pale yellowish. 
Head of a more decided yellow than body, with usually a dark brown 
spot above, one of nearly the same size at the upper front, and two 
rather smaller ones at each side, joined by a brown line, the ante- 
rior spot being lower down than the other. In certain specimens 
these two are blended, and there is only a triangular spot on the 
top of the head, while the depth of the shading on the body is also 
variable. 
In the Transactions of the Illinois State Horticultural Society for 
1867, Prof. Riley speaks of a possible second variety of this larva, 
differing principally from that above described in that the head has 
but one black spot upon each side. 
Pupa.—This is of a dingy greenish-white color, the members 
being somewhat paler than the body. 
LIFE HISTORY. 
According to Prof. Riley’s observations, the adult flies appear in 
early spring and soon lay their eggs, depositing them in the petioles 
of the leaves, pierced for this purpose by the ovipositor of the 
female. These hatch in about a fortnight, and the young worms 
—o 
