Amphibolips pistrix, n. sp.
Agamic form

Gall. — Golden or reddish yellow and rosy russet, brighter when fresh, weathering dirty brown and grayish black; moderately large, up to 52. mm., averaging near 38. mm. in diameter.

Host. — Quercias Eduardi, a small tree with smooth, shining, prickly leaves, a dose relative of the American Q. Emoryi,

Range. — Zacatecas: La Mesa, 7000L Known only from this one locality in a southwestern portion of the state of Zacatecas (southwest of Huejucar)

Life History. — Adults: April 15. 22, 26. We have this insect only from a single locality in the southwestern portion of Zacatecas, very near the boundary of the most northerly projecting finger of the state of Jalisco. Pistrix is one of the nebris-niger-pistrix chain, of species. The gall averages larger than the largest specimens of niger; and this, in connection with the distinct hosts and geographic isolation of the two, is evidence enough of different genetic constitutions in the populations.