. Bulletin - New York State Museum. Science. REPORT OF THE STATE ENTOMOLOGIST I905 I25 being sublateral, each consisting of a circular, chitinous elevation with a median depression or aperture. Black locust midge (Dasyneura pseudacaciae Fitch). Occasionally young leaves of black locust are badly deformed by being folded together so as to produce peculiar podlike galls about 34 inch long. This is the work of the above named small, black midge or fly, which probably deposits two or three eggs in each unfolding leaf. The young maggots hatching therefrom produce sufficient irritation to prevent th
. Bulletin - New York State Museum. Science. REPORT OF THE STATE ENTOMOLOGIST I905 I25 being sublateral, each consisting of a circular, chitinous elevation with a median depression or aperture. Black locust midge (Dasyneura pseudacaciae Fitch). Occasionally young leaves of black locust are badly deformed by being folded together so as to produce peculiar podlike galls about 34 inch long. This is the work of the above named small, black midge or fly, which probably deposits two or three eggs in each unfolding leaf. The young maggots hatching therefrom produce sufficient irritation to prevent the leaf unfolding, and its free edges adhering together more or less form a fairly perfect gall, within which the nearly helpless larva develops to maturity. Sometimes this species is very numerous, since we received specimens from Mr C. L. Williams of Glens Falls, N. Y., accompanied by the statement that some parts of a black locust hedge had nearly every leaf infested by this little insect. It is rarely so abundant as this, though Dr Smith records it as a common species in New Jersey. This insect is with very little doubt the same as that described under the above specific name and referred to the genus Cecidomyia by Dr Fitch in his 5th report for the year 1859, page 53. Some years later Baron Osten Sacken described what is very probably the same form, under the name of Cecidomyia gleditchiae. There are some inconsistencies in colorational characters between the two descriptions, but these perhaps may be partly explained by one describing more matured or even dried specimens while the other characterized fresh individuals. ⦠Description. This little fly was described by Dr Fitch as follows: ''A small, blackish midge, the base of its thorax tawny yellow, its abdomen pale yellowish, with the tip dusky and clothed with fine hairs, as is also the neck; its legs black, with the thighs pale except at their tips ; its wings dusky, feebly hyaline, with the fringe short; its antenna
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