Neuroterus (verrucarum) volutans, new species
agamic form

GALL.—Minute, elongate-oval, hard but thin-walled cells with a slightly elevated apex in center of top surface ; surfaces of galls minutely granular, each cell attached by a broad area to the under surface of the leaf, producing an inconspicuous, smooth but hardly elevated area on the upper surface of leaf ; galls not embedded in any deep depression of under surface of leaf such as is characteristic of the American species of the complex; cells fairly well covered and more or less hidden by a circular tangle of long, brown trichomes which more or less contrast with the normally hairy under-surface of leaf; cells averaging 1.4 mm. in length and 1.0 mm. in diameter, the whole mass of hairs on each gall averaging 2.0 mm. in diameter. Galls often densely covering under surfaces of leaves.

HOST.—Quercus texcocana [deserticola], the smaller-leaved tree which is the commonest white oak in the mountains about the Valley of Mexico.

RANGE.—Mexico: Mexico City, 17 S, 82'00'.

LIFE HISTORY. Agamic females: March 7, 14.

The gall of volutans is superficially quite like those found in the verrucarum complex in the United States. Upon closer examination it will be seen to differ in having no real depression in which the larval cell is sunk—and consequently no great elevation on the upper surface of the leaf.