18 
three ocelli, and surrounded by a triangular area which is irregu- 
larly corrugated, and bordered by a row of sparse, black bristles. 
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. he eyes are of a beauti- 
ful bronze-purple color. 
The thorax is marked by three very broad longitudinal black 
bands, which occupy the greater part of the surface. The cen- 
tral of these extends from the tip of the scutellum to the neck, 
gradually widening anteriorly, and is continued to the ocelli as an 
obscure median stripe, outside of which is an angular brown- 
ish line bounding the corrugated area already mentioned, upon the 
head. The lateral thoracic stripes are usually distinct from the 
median one throughout, but occasionally touch it in front. They 
terminate anteriorly at the margin of the thorax, and extend 
posteriorly along the sides of the scutellum. Upon the surface of 
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. The 
abdomen is also marked above by three longitudinal black bands, 
interrupted at the sutures and confluent posteriorly. 
The color beneath is a uniform pale yellowish-green, with the 
exception of a triangular black spot upon each side, just above the 
posterior cox, and another smaller one above the middle coxe. 
The thighs are a slightly darker tint of the general color, the tibize 
and tarsi dusky, darkening distally. The posterior pair of thighs 
are much thickened, being only about twice as long as wide, and 
are provided on the under surface with a double row of short, thick, 
black spinules. The posterior tibize are strongly curved to conform 
to the inferior margin of the thighs. The femora and tibiew, and the 
tarsi1 above, are sparsely covered with short black hairs, but the 
pubescence of the under part of the body generally is pale. 
The two basal joints of the antenne are yellowish-brown, darker 
above; the basal joint very short, obconical, the second large, com- 
pressed, its vercical depth being equal to its length. Its upper 
margin is nearly straight, and the lower broadly and regularly 
rounded, continuously with the terminal. The third joit is cylin- 
drical, about twice as long as wide, and dusky, as is likewise the 
flagellum. The mouth parts are green, with the exception of the 
palpi which are white, sometimes tipped with dusky. The face is 
smooth and destitute of bristles except for a scanty row of soft 
white hairs about the mouth. 
ligg. The egg of the fly (Plate I, Fig. 5,) is snow-white, fusi- 
form, longitudinally ridged, the space between the ridges being con- 
cave and marked off into rectangular areas by still slighter ridges 
transverse to the others. It measures .023 of an inch in length, by 
.005 of an inch in breadth. 
Larva. (Plate I, Figs. 8 and 4.) A very pale-green, slender, 
footless grub, tapering anteriorly, somewhat narrowed, but subtrun- 
cate posteriorly ; one-fourth of an inch in length by about one- eighth 
that in width. The segments are thirteen in number, counting the 
head; those in the center of the body a little wider than long. The four 
