Amphibolips maturus, n. sp
Agamic form

Gall. — Color yellow tan and rosy russet, brighter when fresh, weathering dark to brown and grayish-black; very large, up to 65. mm., averaging nearer 50. mm. in diameter.

Host. — Quercus serrulata [castanea] (types), a broader-leaved, serrate black oak. Also on Q. mexicana, the slender- and entire-leaved black oak of the area; and on Q. rossi [castanea], a black, oak with obovate, more reticulate leaves. Possibly on all the black oaks of the area.

Range. — Michoacan: Purepero, 5 W, 8500? (Q. serrulata [castanea], types; also on Q. mexicana). Zacapu, 11 E, 8000’ 'Q, serrulata , Jalisco; Sayula, 13 SW, 7700’ (Q. Rossi). Possibly throughout a considerable portion of southwestern Mexico, at least through much of the states of Michoacan and Jalisco.

Life History. — Adults: .March 25, April 10, 20. The galls which we have seen average larger than in most species. In several of these characters, matures shows relations to the branch of the complex, and not to the nebris-niger-pistrix chain of species.