346 Annals Entomological Society of America [Vol. IV, 



7 ANDRICUS Hartig. 



Cynips (part.)! Linne, Syst. Nat., ed. 10 (175S), p. 553. 

 Andricus (part.), T. Hartig, Zeits. f . Ent., vol. 2 (1840), p. 1S5, 190. 

 Andricus, Aphilothrix, A. Porster, Verb. Zool. Ges. Wien, vol. 19 Abh. (1869), 

 p. 331, 335. 336 



Andricus, G. Mayr., Gen. d. Cynip. (1881), p. 12. 



Cheeks at most only half the length of the eyes. Antennae of female 

 12-16 segmented, of male 14-17 segmented. Pronotum narrow in the 

 middle. Mesonotum shagreened or nearly smooth, sometimes trans- 

 versely folded. Parapsidal grooves usually percurrent. Scutellum 

 with two basal foveas, without median line on disc. Metanotal ridges 

 parallel or arcuate. Radial cell elongate, open at the margin. Tarsal 

 claws bidentate. Abdomen almost glabrous. Agamic and sexual 

 generations. 



Andricus quercus-californicus (Bass.) 



Cynips quercus californica, H. F. Bassett, Can. Ent., vol. 13 (1881) p. 51. 

 Andricus californicu . G. Mayr, Gen. d. Cynip. (1881), p. 28. 

 Andricus (Callirhytis) californicus, Ashmead, Tr. Am. Ent. Soc, vol. 12 

 (1885), p. 294. 



Female. Reddish brown, eyes, ocelli, tips of mandibles, 3rd to 6th 

 and 1st antcnnal segments proximally and ventral valve black or 

 blackish. Head, thorax and legs covered with yellowish white pubes- 

 cence. Head faintly rugose, broad and bulging laterally beyond the 

 eyes, antenna? 14-segmented, filiform, 1st and 2nd segments stout, 3rd 

 long, longer than 1 and 2 together, succeeding segments to 9th proj 

 sively shorter, 9th and following segments subequal except the last, 

 which is twice as long as penultimate. Pronotum narrow in the middle, 

 faintly rugose, mesonotum shallowly punctate, parapsidal groov 

 incomplete, reaching slightly beyond the middle, median longitudinal 

 lines extending half-way to posterior margin, smooth lines over base of 

 wings long and thin, a median bare spot on pleura smooth and shining, 

 scutellum cushion-shaped, rugose, with rather indistinct basal fovea?. 

 Abdomen broad, smooth and shining, dorsally ridged at apex, 2nd seg- 

 ment occupying about half its length, pubescent at sides basally, 

 ventral valve and sheath of ovipositor also pubescent. Wings hyaline, 

 pubescent, veins brownish, radial cell rather short and open at the 

 margin, vein at base angulate, areolet large, cubitus almost reaching 

 basal vein. Length 5 mm. 



Gall. The familiar "oak-apple;" large, smooth, yellowish white, 

 globular galls found on the branches of Quercus lobata, 50 to 60 mms. or 

 more in diamater, sessile, polythalamous, the numerous larval cells 

 imbedded internally in a rather dense cellular tissue. 



Habitat. Santa Rosa, Cal. (Miss Josephine Van Wormer). 



Andricus chrysolepidis Ashm. 



Andricus chrysolepidis, Ashmead, Proc. U. S. Nat. Mus., vol. 19 (1896), p. 119. 



"Gall. A very hard, ovate, or globular gall, with a nipple at apex 

 and a centrally imbedded larval cell; externally it is covered with a 

 dense, fine, short pubescence like the pubescence on a peach, although 

 sometimes this is rubbed off. Diameter, 5-S mm. 



