Neuroterus (niger) reconditus, new species
Agamic form

GALL.—Minute, inconspicuous pustules in the blade of the leaf ; somewhat circular or more ovoid in shape, equally developed on both surfaces of the leaf, inconspicuous on both, but more conspicuous above because of the nature of the upper surface of the leaf ; gall surface naked, without irregularities other than those normal to the leaf surface ; fresh galls of the same color as the leaf, old galls becoming browner sooner than the
rest of the leaf; averaging 1.0 mm. in diameter. Galls fairly numerous on single leaves.

HOST.— Quercus macrophylla [magnoliifolia], the largest-leaved white oak of the area.

RANGE,—Aguascalientes: Pabellon, 20 W, 7000' (types). Probably confined to a portion of the Western Sierra in Mexico, including the state of Aguascalientes.

LIFE HISTORY.—Agamic females: emerging April 10.

The niger complex has been known from the eastern U. S., from our Southwest (but not from the Rockies further north), and from California. The present species is the first to be described from Mexico. Like all the other described species of the group, reconditus differs chiefly in the minor color characters noted above; but the form of the gall provides some further basis of differentiation of the species.