Disholcaspis unicolor, new species

Hosts: Quercus sp. [Quercus oleoides added as a placeholder]

GALLS.-Large, globular bullet-galls (Figs. 40 to 43) with a nipple at the apex; rough, with a mealy covering when younger. Monothalamous. 21 mm. or less in diameter. Buff-brown in color when young, dark gray or black when old. Internally quite filled with a solid, woody tissue, the thick-shelled, egg-shaped larval cell separable but tightly enclosed in the younger gall, lying loose in a good-sized cavity in the mature gall. On the twigs of a species of Quercus, singly, or several near together.

RANGE.-Mexico: Saltillo Mts. (Palmer Coll.).

Except for its more woody tissue internally, the gall of this species seems quite identical with the gall of Disholcaspis cinerosa (Bassett,1881, Can. Ent., XIII, p. 110), which is known from Texas only. The adult, though very closely related to cinerosa, is really very distinct and readily distinguished from that species by the key characters I have given at the beginning of the description of this species. I have examined a large series of adults of cinerosa and do not find that it varies toward unicolor.