Femuros geniale comb. rest.

Femuros geniale, n. sp.
Agamic form

Gall. — Small, narrowly cylindric, with the walls of the upper half of the gall quite thin and often puckered, nearly or entirely shut at top, although the cavity thus enclosed occupies more than a third of the diameter of the whole gall; outside of gall silvery brown, with little or no bloom, diameter up to 8.0 mm, averaging nearer 6.0 mm.; length up to 11.0 mm., averaging nearer 8.5 mm.

Host. — Quercus undata, Possibly on other white oaks in the area.

Range. — Durango: Durango, 2 N, 6500' (types). Canatlan, 7 N, 7400' Probably restricted to a part of the Western Sierra of Mexico centering in western Durango.

Life History. — Adults: in spring.

The present species is the most northern of the four herein described. We have it from two localities not far apart in the state of Durango. The galls of geniale are practically identical with those of integrum — these being the smallest and most regularly cylindric in the complex,