18 
three ocelli, and surrounded by a triangular area which is^irregu- 
larly corrugated, and bordered by a row of sparse, black bns^d 
just outside the posterior angles of this area are two stout, erect 
bristles similar, but smaller bristles border the eyes internally;! 
otherwise the head is destitute of hairs. The eyes are of a beauti¬ 
ful bronze-purple color. . j 
The thorax is marked by three very broad longitudmal blaoh 
hands which occupy the greater part of the suiface. Ihe cenj 
tol of these extends from the tip of the scutellum to the neck: 
gradually widening anteriorly, and is continued to the ocelli as ar 
obscure median stripe, outside of which is an angular brown 
ish line bounding the corrugated area already mentioned, upon tk 
head. The lateral thoracic stripes are usually distinct from tin 
median one throughout, but occasionally touch it m front. The 
terminate anteriorly at the margin of the thorax, and extern 
posteriorly along the sides of the scutellum. _ Upon the surface o 
the thorax are a few scattered, short, black hairs, with a small num 
ber of long bristles intermixed, especially prominent near the pos 
terior margin of the thorax and at the tip of the scutellum. Th 
abdomen is also marked above by three longitudinal black bank 
interrupted at the sutures and confluent postenoily. 
The color beneath is a uniform pale yellowish-green, with th 
exception of a triangular black spot upon each side, just above th 
posterior cox*, and another smaller one above the middle coxa 
The thighs are a slightly darker tint of the general color, the> tibii 
and tarsi dusky, darkening distally. The posterior pair of thigh 
are much thickened, being only about twice as long as wide an 
are provided on the under surface with a double row of short, thici 
black spinules. The posterior tibiee are strongly curved to contori 
to the inferior margin of the thighs. The femora and tibiae, and th 
tarsi above, are sparsely covered with short black hairs, but t 
pubescence of the under part of the body generally is pale. 
The two basal joints of the antenna? are yellowish-brown, dark*} 
above: the basal joint very short, obconical, the second large, coe 
pressed, its vertical depth being equal to its length, its hPP 1 
margin is nearly straight, and the lower broadly and regular 
rounded, continuously with the terminal. The third joint is cyJi 
drical, about twice as long as wide, and dusky, as is likewise t 
flagellum. The mouth parts are green, with the exception ot t) 
pafpi which are white, sometimes tipped with dusky. Ihe lace 
smooth and destitute of bristles except for a scanty row ot sc 
white hairs about the mouth 
Eqq. The egg of the fly (Plate I, Fig. 5,) is snow-white, fus| 
form' longitudinally ridged, the space between the ridges being co 
cave and'marked off into rectangular areas by still slighter riclgl 
transverse to the others. It measures .028 of an inch m length, 
.005 of an inch in breadth. 
Larva. (Plate I, Figs. 8 and 4.) A very pale-green slend* 
footless grub, tapering anteriorly, somewhat narrowed, but subtru 
cate posteriorly; one-fourth of an inch in length by about one-eighj 
that in width. The segments are thirteen in number, counting 11 
head ; those in the center of the body a little wider than long. Ihe tcj 
