Amphibolips gumia

Quercus emoryi, hypoleuca [hypoleucoides]
Stem galls
detachable
Doubtfully distinct from above.

Amphibolips gumia, n. sp.
Agamic form

Gall. — Externally a peculiar brownish yellow or russet peach in color, the hairs on the interior of the gall very largely bright russet peach; of fair size, up to 43. mm., averaging near 30. mm. in diameter.

Host. — Quercus Emoryi, the shining- and prickly-leaved black oak of lower elevations in southern Arizona. Galls also recorded from Q. hypoleuca (Weld 1326).

Range. -- Arizona: Fort Huachuca (types; also galls acc. Weld 1926). Santa Rita Mountains (galls; also galls in U. S. Nat. Mus.). Bisbee (galls, acc. Weld 1926), Santa Catalina Mountains (galls, acc. Weld 1926). Chiricahua Mountains (galls in U, S. Nat. Mus., acc. Weld 1926). Fort Grant (galls in U. S. Nat. Mus., acc. Weld 1926). Apparently confined to the desert mountain ranges of southernmost Arizona and immediately adjacent New Mexico

Life History, — Galls collected in mid-January had nearly all adults emerged. This, the only American representative of the complex, is a conspicuous object on the black oaks of the desert-mountain ranges of southeastern Arizona. The insect appears to be identical with the insect of A jubatus, from the state of Durango in Mexico; but the galls of the two are very different, those of the Arizona species being of fair size and peculiarly russet peach in color, while those of jubatus are distinctly small and peculiarly brassy yellow in color. Between the ranges of the two are more than 500 miles of Mexican Sierra, occupied by two other species of this complex, namely elatus and nebris, and this seems to justify the use of the gall characters as evidence that the Arizona and Durango insects do not share the the same stock of genes.