Page:New species and synonymy of American Cynipidæ.pdf/7

1920]

The adults emerged from June 5 to 12, 1919, the eggs undoubtedly having been deposited in the young plant in the previous June, the pupae overwintering in the dry stems of the host plant. Almost all of the males emerged before any of the females appeared; after thirty-six hours the females began appearing and the resulting ratio was 84 per cent females to 16 per cent males. Two parasites were bred from the galls.

The adult of this species is somewhat like that of A. tumida, but annulata is readily distinguished by the key characters given at the beginning of the description.

The galls of annulata are not much different from some of those of A. tumida, although the adult is distinct. It is quite likely that there are many species in this, a primitive genus of the Cynipidæ, which are not yet known, being mistaken for other species with similar galls. These galls are simple swellings of the stems of herbaceous plants, with some proliferation of the pith-cells, but with the resulting deformations all so slight (comparatively) that the galls of different species are not distinguished as completely as are the galls of the higher cynipids.

Diastrophus tumefactus, new species Plate XXI, Figures 10 and 11

[No name, gall only], 1909, 39th Report Ent. Soc. Ont., p. 79.

.—Length under 2.0 mm.; thorax mostly black, legs and antennae uniformly golden brown; wings without areolet. rufo-piceous, almost black on the vertex, reddish toward the mouth-parts; mandibles large, brownish; head finely coriaceous except for a smooth median elevation and the usual aciculated cheeks