Erythres hastata, n. sp.
Agamic form

[Genus level description: Gall. — A separable, cone-like, terminal cluster of aborted, fasciated leaves and bracts enclosing a small, seed-like cell. The cluster composed of many, awl-shaped bracts and aborted leaves, the inner leaves elongate, narrow, awl-shaped, with sharply-pointed tips, each terminating in fine filaments, the outer bracts short, more broadly triangulate; the whole forming an elongate or swollen cone; fresh galls probably green in color, dried galls straw to medium brown, weathering more silvery gray; the galls up to 25,. mm. in length and 13. mm. in greatest diameter, internally the larval cell is small, up to 6.0 mm. in length and 2.0 mm. in greatest diameter, elongate spindle-shaped, sharply tipped, thin-walled, and closely embedded in the surrounding bracts. Highly separable galls, borne terminally on main or lateral stems.]

Gall. — An elongate, slender, and rather loose cluster of fasciated leaves, up to 25. mm,, averaging near 20, mm. in length and 8.0 mm. in greatest diameter, the mature galls widely flaring and loose-leaved at top, with the greatest diameter near the tip.

Host. — Quercus serrulata [castanea] (or a close relative), one of the prickly-tipped, nearly entire-leaved black oaks which forms small to medium-sized trees. Possibly on other black oaks of the area.

Range. — Michoacan: Zacapu, 11 E, 8000’ (types). Probably restricted to a limited portion of Mexico which includes the eastern part of the state of Mochoacan

Life History. — Adults: January 12, February 10, in the first year after the development of the galls.

Hastata differs most from jaculi in having the conical gall very slender, loose and flaring open at the top, with the greatest diameter in mature galls there at the top.

- Alfred Kinsey: (1937) New Mexican gall wasps (Hymenoptera, Cynipidae). II^©