Dasineura cercocarpi

Dasineura parthenocissi

Gall.- 8 to 10 mm. in diameter, elongate, oval, white or slightly brownish and thickly tomentose. This gall is an arrested, imbricated bud containing several larvae.

Dasyneura parthenocissi Stebb. 
1906. Jarvis, T. W., Ent. Soc. Ont., 32d Rept., pp. 68-69, PI. D, fig. 7 (without name). 910o. Stebbins, F. A., Springf. Mus. Nat. Hist. Bull. 2, p. 44 (Cecidomyia).

Gall. -Length about 1.5 cm., diameter about i cm. The upper surface of the leaf, usually along the midrib, is slightly contracted, while on the lower side there is a turgid lateral swelling usually originating from the midvein and generally (in specimens collected in I912) showing distinct ridges or carinae. In some instances series of galls attain a length of 6 or 7 cm. and in a number of cases all of the leaflets of one leaf were infested. In a few instances the attack developed so early as to practically prevent the formation of foliage, though in most cases the leaves attained nearly full size. 

Descriptions of Gall Midges (Diptera)