184 
F. M. CAMPBELL-THE HESSIAN FLY. 
puparium is newly formed, the transverse lines showing the divisions 
of the segments of the larva are easily observable. As it grows 
older, these transverse lines almost entirely disappear, and it becomes 
marked with longitndinal lines and depressions. 
The female “ The body is rather slender, uniformly dark brown, 
the head is round but somewhat flattened, the eyes are black, the 
wings uniformly dull smoky blown, while the legs are paler brown 
than the rest of the upper side of the body. 
‘ ‘ The body, wings, and legs are provided with fine hair-like 
scales, those on the wings being in many cases quite broad and. 
ribbed, somewhat like the scales on the wings of a butterfly or 
moth. The pale brown antennae are about half as long as the body, 
the joints are very distinct, like a string of beads, each one being 
oval-cylindrical. There are seventeen joints,f the two basal ones 
being large, nearly globular, flattened lengthwise, and nearly half 
as long as thick, and each of nearly equal size; joints 3-5 are 
longer than the remaining ones, and are slightly contracted in the 
middle; the remaining 6-17 gradually increase in length, each 
joint being provided with about ten hairs, arranged in a rude whorl; 
the terminal joint is long and conical. The legs are of the same 
colour as the under side of the body, being a little paler than the 
back. The abdomen is rather full, with nine well-marked rings or 
segments, the paler small ovipositor forming the tenth. The latter 
is one-half as thick as the ninth segment, and about two-thirds or 
quite as long; is slightly sinuous, and a little smaller at the end 
than at the base. The wings are dusky, with a fine fringe around 
the edge, and there are three veins. The subcostal vein ends near 
the outer third of the wing; the median vein arises from near the 
base of the submedian vein and runs nearly parallel to the sub¬ 
costal vein, while a branch (its base disconnected with the main 
vein) extends along the middle of the wing; the submedian vein 
is well developed, at the base throwing ofl the median vein at a 
little distance from the base of the wing, and losing itself before 
turning down to the edge of the wing. The length of the fly is 
2*5 millimetres, or about one line, i.e. -A-th of an inch.” 
The male .—“ The male is rather smaller than the female, being 
distinguished by the long, slender abdomen, and the longer and 
more hairy antennae. The joints of the latter are twenty in 
number, J oval, the terminal one conical, and all provided with a 
few hairs, much longer than those of the female, and arranged in a 
decidedly verticillate manner. The abdomen in the living specimen 
is black or brownish black, with bands at the sutures both above 
and beneath, of a brick red, tawny yellow, or greyish colour, varying 
in their width as this part of the body is more or less distended” 
The claspers at the end of the body are stout, much more so than 
in Cecidomyia leguminicola of the clover. 
* See the ‘ Entomologist,’ p. 170, July, 1887, for descriptions by Dr. H. It. 
Meade of female and male from English specimens. 
t The number varies from 16 to 18. 
J The number varies from 17 to 20, 
