Erythres jaculi, 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, tip 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. — A swollen, very compact cone of fasciated leaves, with the greatest diameter near the base, with the apex of the gall drawn to a blunt point; up to 25. mm,, averaging near 20. mm. in length, up to 13.0 mm, averaging near 11. mm. in greatest diameter.

Host. Q. Rossi;, a larger tree-form or black oak with large, coarsely reticulate leaves. Possibly on other black oaks of the area.

Rango. — Jalisco: Sayula, 13 SW, 7700’ (types). Possibly widely spread through a southwestern portion of Mexico which includes the state of Jalisco

Life History. — Adults: March 20.

This insect, jaculi, is different enough from hastata. It is most distinct in its almost uniformly sooty black mesonotum, its conspicuously broader head and thorax, and the much more compact gall — a cone which is broadest -at base and printed at top.

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