188 NEW YORK STATE MUSEUM 
fig. 10) hyaline, costa light brown. MHalteres pale yellowish. Legs 
light fuscous yellowish, tarsi lighter; claws slender, uniformly curved. 
Genitalia (pl. 19, fig. 1); dorsal plate deeply and triangularly incised, 
the lobes divergent, tapering, broadly rounded; ventral plate broad 
at base, deeply and roundly emarginate, the lobes well separated, 
narrow, obtuse; style long, stout, broadly rounded. Type Cecid. 515. 
Itonida aphidivora Felt 
1912 Felt, E.P. N. Y. Ent. Soc. Jour., 20:245-46 
1914. ————Econ. Ent. Jour., 7:458 
This midge was reared in some numbers from apple leaves infested 
by the rosy aphis, Aphis malifoliae Fitch, at Nassau, N.Y. 
Itonida aprilis Felt 
1912 Felt, E.P. N.Y. Ent. Soc. Jour., 20:247 
These midges are among the early appearing forms taken at 
Ailigamaap Nba ve. 
Itonida tritici Felt 
1912 Felt, E.P. Econ. Ent. Jour., 5:289 
1918 ———— N.Y. State Mus. Bul. 200, p. 22 
This is not the Cecidomyia or Diplosis tritici Kirby, a 
species described by several authors as having a long ovipositor and 
a midge associated with serious losses to grain in Europe. The 
type of Kirby’s species has been destroyed (Trans. Linn. Soc. 4: 
232, 1798). It is doubtful if the true Cecidomyia, presumably the 
GComtari nia itt it 117, Korbys foceursisin whe} Unitedmistates: 
The specimens described under the above name are in the United 
States National Museum collection at Washington, were labeled 
Cecidomyia tritici Kirby and were presumed to be the 
midge which caused so much loss to American wheat growers in 
earlier years, since they were reared by Theodore Pergande 
from typical wheat midge material. The economic status of 
this species can not be determined at the present time, though 
data at hand indicate that most of the injury in American 
wheat fields is probably due to the work of the European 
Thecodiplosis> mosellana Gehin, and if this be\the 
case it follows that the extensive American wheat midge litera- 
ture relates to this species and not to the insect formerly supposed 
to be the cause of the injury. It is to be expected that several 
midges would occur in wheat heads. The writer has already 
characterized three and others are known to occur in Europe. The 
difficulty is to determine between comparatively rare and relatively 
innocuous species and the one or more destructive forms. 
