THE CANADIAN ENTOMOLOGIST 345 



DESCRIPTIONS OF NEW CYNIPID^ 



BY WM. BEUTENMULLER. NEW YORK. 



Andricus castanopsidis, sp. nov. 



Female.- — Head jet black, finely wrinkled and with whitish 

 hairs on the face Antennae long and slender, filiform, 14-jointed, 

 3rd — 8th joints long, the 3rd longer than the others, 9th-14th joints 

 short and not much thicker than the preceding joints, 1st and 2nd 

 joints short and stout, 2nd shorter than the 1st; joints 1-8 rufous, 

 9-14 black. Thorax jet black and highly polished, microscopically 

 wrinkled, under a high power lens, smooth to the naked eye, 

 strongly arched on the summit. Parapsidal grooves broad and 

 deep at the scutellum, gradually becoming narrower as they reach 

 the collar. These grooves are parallel for their greater length, 

 and converge shortly before their posterior ends. Median groove 

 very faint and only visible in certain lights. Anterior parallel 

 lines very fine and scarcely evident. Lateral grooves wanting. 

 Scutellum black, reticulately rugose, with two very large, deep 

 and glossy basal fovese. Abdomen rufous, darker posteriorly, with 

 the upturned sheath of ovipositor black. Legs rufous. Wings 

 hyaline; radial area open, the subcostal vein not reaching the 

 costa; cubitus not extending to the first cross-vein; areolet large. 

 Length 4 mm. Antennae 3 mm. 



Gall. — On the blossoms of Western Chinquapin (Casfanopsis 

 sempervirens and C. chrysophylla) in May. Monothalamous. 

 Brown, globular and exceedingly thin-shelled; the outer covering 

 being skin-like. Internally it is filled with a soft, porous, pith-like 

 substance. The round, central larval chamber is thin-shelled and 

 firmly imbedded in the pithy part. The gall is probably . green 

 when fresh and very soft. Diameter 12-24 mm. 



Habitat. — Pacific Grove, Monterey Co., Calif. (Miss Dorothy 

 Egbert), galls and flies; Truckee, Calif. (H. G. Dyar), galls and 

 flies, U. S. Nat. Mus.; Mt. Tamalpais, Calif. (L. H. Weld), galls; 

 Placer, Co. (A. Koebele), galls. 



A distinct species very much resembling a Diastrophus in 

 general appearance. The point of attachment of the gall is xevy 

 short, and when mature it drops to the ground. The male is un- 

 known. 



October, 1917 



