Andricus perdens, new species
Plate XXIV, Figures 5 to 7
Female.—Generally dark rufous, mesothorax shining, obscurely reticulated, hairy; seutellum squared off posteriorly, areolet moderately large, radial area broad. Head: Not as broad as the thorax, considerably broadened behind the eyes; deep rufous, piceous black at the mouth and on the mouth-parts; rugoso-coriaceous, a rugose area between the ocelli, face more rugose, (hairy?). Antennae hairy, joints one and two piceous black, three and four black, second segment almost globular, very much the smallest, three as long as one and two together and almost twice as long as four. Thorax: Mesothorax deep rufous; appearing smooth and shining, finely reticulated, moderately punctate and hairy, more densely punctate and hairy anteriorly; parapsidal grooves continuous to pronotum, narrow, distinct, divergent anteriorly, curved and convergent at the scutellum where they are only narrowly separated; median groove only evident, but is evident for the length of the mesonotum; anterior parallel lines hardly evident for less than half the length of the mesonotum; lateral lines indicated by a smooth area; scutellum rufous-piceous, piceous black at base, somewhat longer than wide, widest near the posterior end, abruptly squared off posteriorly, rugose, dense with long hairs, two basal foveae broad, deep, shining, smooth, set at a 90° angle; pronotum rufous-piceous, about black at the edges, rugose, dense with long hairs; mesopleuræ rugoso-aciculate and hairy at top and bottom, a large smooth, shining and (apparently) naked area centrally. Abdomen: Rufous, rufous-piceous dorsally and basally, smooth and shining, hairy at the base laterally, (posterior segments hairy?); higher than long, more extended dorsally, edges of basal segments curved ventrally but segments not "tongue-shaped"; second segment occupying about half the area; ventral spine darker rufous, hairy, extended into quite a long, slender, fine-tipped spine; ventral valves piceous black, at a 60° angle. Legs: Brown-black, the coxæ and at least the front tibiæ in part rufous; densely punctate and hairy; tarsal claws well developed, not toothed. Wings: Clear, set with fine hairs, ciliate on edge; veins rufous brown, subcosta, radius and basalis heaviest; areolet moderately large; cubitus just continuous to the basalis but faint there; radial cell open, broad, subcosta stopping quite a little short of the margin; second abscissa of the radius somewhat curved; the first abscissa somewhat angulate but without a projection. Length: 3.0 mm.
Galls (Pl. XXIV, Figs. 5-7). Stem swellings, raggedly split open, containing flattened seed-likeeells. The swellings are 6.-13. mm. in diameter by 1.5-20. cm. long. Within are large cavities, 4 or 5 arranged more or less radially about the axis of the stem, and a great many in series along the stem, each cavity sector shape, extending to the bark, 10. mm. wide or less at the edge. Inserted on the wall of each cavity is a larval cell; each cell is monothalamous, flattened, a somewhat squared oval in outline, 4. mm. high by 3. mm. wide, broadest at the top; concave at the base with a projecting tongue by means of which the cell is inserted in the twig; cells smooth, shining, buff-yellowish, finely streaked, more or less, with purplish brown. The cell walls are shell-like, moderately thick, entirely hollow within. At maturity the bark splits raggedly over each cavity, the larval cell drops to the ground, and the affected twigs die. On terminal twigs of Quercus Kelloggii.
Range.—Oregon: Ashland and Grants Pass. California: Gilroy (Redwood School), Placerville and Ukiah.
