produced dorsally for three-quarters the total length of the abdomen. Legs: rufous, only slightly lighter than the thorax; tips of tarsi darker, quite hairy; tarsal claws toothed. Wings: tinged with yellow, and covered with rather long yellow hairs, the veins dark translucent brown, the basal vein, distal half of the subcosta, and the radial veins darkest and heaviest; the areolet of moderate size or moderately large; the cubitus reaches or almost reaches the cross-vein (but without becoming brown and heavy at the point of union as in Dryophanta bella and D. nubila); apical branch of the subcosta almost lacking; first abscissa of the radius angulate, the apex of the angle being thickened and high up on the vein, almost at the point of union with the subcosta; second abscissa of the radius arcuate, making the radial cell broad and short; two or three irregular, rather indistinct, brownish patches in the apical cell, a trace of one in the discoidal cell, and a small, clouded spot on the discoideus not far from its union with the basal vein. Length: 2.5–3.2 mm.
Galls.—Globular (Figs. 19 to 21), smooth, dull or somewhat shining, thin-shelled, yellowish to pinkish, translucent galls, monothalamous, 8–15 mm. in diameter, empty except for a few, very fine, radiating fibers which hold the larval cell central in the gall; in size the larval cell is about 2×3 mm. On the under surfaces of leaves of a species of Quercus, attached to a vein.
Range.—Colorado: Colorado Springs (Carpenter Coll.).
Cotypes.—Eight female and eight gall cotypes in the collections of The American Museum of Natural History, the Museum of Comparative Zoology, and in the author's collection. One of the adults was bred; the others I cut from the galls collected by Lieut. W. L. Carpenter, September 25, 1873.The material from which this species is described is that referred to by Osten Sacken in Hayden's report for 1873, the U. S. Geological Survey. Most of the adults had emerged from the larval cell but were found dead within the outer wall of the gall.
The gall is very pretty, being even thinner than the galls of Dryophanta bella, D. dugesi, and D. rubræ, which it resembles. The insect, in having spotted wings, and in other respects, is similar to the adults of those same species, but is completely differentiated by the key characters given in the description. A. pellucidus belongs to a natural group containing the species mentioned above, Dryophanta (Disholcaspis) centricola, et al., and this is one of the groups which must be separated from other unrelated things now included in the genus "Dryophanta." Until complete revision of the cynipid genera can be made I give this species the meaningless name of Andricus.
Andricus peredurus, new species
Plate XXV, Figures 28 and 29
