[A photo of this gall appears on page 12 of the pdf]

Amphibolips jubatus, n. sp.
Agamic form

Gall. — A peculiar brassy yellow and rosy russet, weathering greenish brown or darker; the smallest galls in this complex, up to 30. mm'., averaging near 21. mm. in diameter.

Host. — Quercus fulva (types); Q. Eduardi, Apparently one species on these two very different black oaks. The first is a small tree with large leaves that are heavily felted underneath: the second is the small- and prickly-leaved black oak related to the American Q. Emoryi,

Range. — Durango: Otinapa, 8500' (types. Q. fulva), Patos, 15 W, 8000- (Q. Eduardi), Patos, 15 W, 8500’ (Q. fulva). Apparently confined to the state of Durango, replaced on Q. incarnata in the same area by A. niger.

Life History. — Emergence dates not recorded; probably in March and April, as in the related species of the complex.

This species, jubatus, is the common one throughout the state of Durango. It is replaced in the same area by A. niger on Q. incarnata, Jubatas has its closest relative in elatus, from the southern end (and probably from most of the state) of Chihuahua. Niger is one of three closely related species, nebris, niger, pistrix, which we have from Parral (in the southernmost tip of Chihuahua), from southwestern Durango, and from Zacatecas, respectively. There are evidently two separate lines in the phylogenetic chains, and the two species occuring in Durango .are not as dose relatives as each is to geographically more remote species. The host isolation of the two species in Durango indicates a further difference between them in sensory reactions. The galls of jubatus and niger distinctly differ in color, jubatas galls being a peculiar brassy yellow, those of urger (he same straw yellow that is common in the complex; and the galls of average distinctly smaller — smaller than any others in the complex.