at 
honey-yellow, their pedicels with a strong notch in the middle of 
their anterior sides. 
The anpomen throughout is of an orange color, more inclining to 
red than to yellow. Its broadest part scarcely equals the thorax in 
diameter. It is of an ovate form, attenuated towards its tip, whence 
the two valvular sheaths of the ovipositor are often seen more or less 
exserted, and sometimes the apex of the ovipositor itself projecting 
between them like a fine slender thread. According to Mr. Curtis, 
by a slight pressure on the abdomen of the living insect, the ovi- 
positor ( Plate 5, fig. f) can be made to protrude, and may then 
be drawn out to nearly thrice the length of the body. 
The wines are hyaline and colorless, appearing like thin plates 
of glass or mica, but reflecting the tints of the rainbow, particularly 
the violet, when viewed in certain directions. ‘Their margins are 
densely ciliated with longish hairs, and their surface is covered with 
minute pubescence. ‘The mediastinal or submarginal nerve is but 
slightly distant from the costal (marginal), and becomes confluent 
with it rather forward of the middle of the exterior margin. From 
its middle, it sends a small connecting nerve backward to the post- 
costal. The postcostal, which is the most conspicuous nervure of 
the wing, runs direct, or with but an insensible curve, to the tip of 
the wing. The medial is straight, and attains the inner margin at 
about three-fourths of the distance from the base to the apex of the 
wing. The anal runs nearly parallel with the inner margin, and, with 
a very sudden curve from its direct course, joins the margin near 
its middle. It gives off an obscure branch at its angle, which curves 
outwards and backwards, joining the medial, or rather, seeming 
(if the wing be moved so as to give a slightly different incidence 
to the light) to be continued onward, parallel with and contiguous 
to the medial nerve, till it attains the margin of the wing. The me- 
dial and anal nerves are very slender, and are often invisible, ex- 
cept in a particular reflection of the light. The former, especially, 
can seldom be distinctly traced, except towards its termination. 
These details of the neuration of the wing apply equally well to all 
the species of Cecidomyia that have fallen under my observation, 
save only that they are more distinstly traced in the others, particu- 
larly the larger species. At rest (Plate 5, fig. 6), the wings are laid 
one upon the other, reposing horizontally upon the back of the 
abdomen, and reaching about a fourth of their length beyond it. 
