100 
As the gall gets older the blistered areas become specked with brown, 
and finally the entire gall turns brown and the leaflet dies. Inside the 
pod are the maggots — white or orange, according to age — and the 
white cocoons. The eggs are to be found only between the folded 
halves of the smallest leaflets, near the ground. 
An afifected leaflet continues to grow, and its forage value is 
scarcely diminished, but its death is hastened a little by the maggots. 
There is no effect upon the plant as a whole; when only one leaflet of 
a leaf is afifected by the insect, the other two remain healthy for an in- 
definite time, but all three will at length wilt and die a little pre- 
maturely. 
It can hardly be said that this insect actually injures white clover, 
taking everything into consideration. 
Stages. — The egg has not been described before. It is like that of 
many other common midges, being elliptico-cylindrical with a slight 
curvature, colorless and translucent when laid, but showing an internal 
red spot on the second day — not before — and becoming pale orange in 
color. Length, 0.3 mm. ; width, 0.075 mm., — on an average. Several 
eggs are laid, side by side usually, as in Plate II., Fig. 5, in which the 
variation in the length of the eggs is to be laid to the midge instead of 
to the artist. 
The newly born larva is colorless and transparent, and 0.27 mm. 
in length: scon it heconxs white; when old il is orange ( I'l. II., Fig. 6), 
and when full grown its length is 1.5 to 2 mm. The skin is coarsely 
granulate. The spiracular tubercles are arranged precisely as in the 
larva of the clover seed-midge — in fact, this arrangement is the same 
in several species that I have examined. The form of the sternal 
spatula ( PI. II., Fig. 7) is, however, different from that of D. Ic(jitiiii)iic- 
ola, the only species likely to be confused with this one as it occurs on 
clover. 
The cocoon is oval in general outlijie. and 1.5 mm. long. Often 
it is flattened a little from contact with the leaflet or with other co- 
coons. 
The pupa, orange in color, has a darker median ventral stripe, and 
blackish eyes, as Comstock says. The anterior border of the pro- 
thorax is deeply notched, and there are two long, excurved, meso- 
thoracic horns. 
Comstock gave a translation of the original description of this 
midge, which need not be repeated here. Rearing the midge from 
white clover, there is no difificulty in determining the species. Catch- 
ing it on the wing, the leaf-midge needs to be distinguished from the 
secd-midge, which it resembles. Figures 3 and 8 of Plate II. show the 
dififerenccs between the two species. The leaf-midge (Fig. 8) is the 
smaller of the two, the female measuring 1.6 mm. in length. Both 
.species have the red abdomen, but the dorsal bands of black scales are 
much larger and denser in trifolii than in leguminicola, and the scales 
do not rub ofif so easily, so that the abdomen in the former species is 
usually blackish. In addition, the leaf-midge has 14 or 15 antennal 
