[nsect Galls. 19 



May. Males and females emerge in June. Sonic females remain until 

 October (0. acicnlata Os ten Sacken.) A good example of dimorphism. 



Amphibolips inanis Osten Sacken. Empty oak-apple. 



Callaspidia confluenta Fitch (non Harris), 5th rept. ins. N. Y. f. 1858, 1859, p. 817. 

 Cynips quercus i nun is Osten Sacken, Proc. Ent. soc. Tin I.. 1861, v. 1, p. 58, 242; 1865, v. 4, p. :<:><.. 

 Walsh, Proc. Ent. soc Phil., 1864, v. •_', |>. 157 460; 1864, \ . ::. p. 408-430 

 \\ alsh and Riley, imer. ent., 1869, v. l, p. 104, fig. Ti). 

 Walsh, Aiiiit. ent., 1870, v.j. p. 330-335, flg. 6. 

 Amphibolips inanis Ashmead, Trans. Ann-r. cut. soc. 1885, v. 12, p. 294. 

 Gillette, Psyche, 1889, v. 5, p. 184. 

 Packard, 5th rept. 17. S. ent. eomm., 1890, p. 105. 



Beutenmuller, Hull. Amei. mus. nat. hist., 1892, v. I. p. 251, pi. 10, fig. 5. 

 Cook, Ohio mil., 1902, v. -J, p. 268, fig. Js; L904, v. 4. p. 1 l'.t. 126, 131, flg. 79, 104. 



This is a spherical gall with thin walls from which many fibers extend 

 towards the center, these holding in place the cell in which the larva 

 develops. The gall is between 15 and :J0 mm. in diameter, light yellow- 

 green changing to light brown. Common on leaves of scarlet and red 

 oak, Quercus coccinea and Q. rubra. Matures in June. 



Amphibolips nubilipennis Harris. Transparent oak-gall. Fig. 23. 



Cynips nubilipennis Harris, Rept. ins. Mass. inj. veg., 1841, p. ttis; Treat, ins. N. E. inj. veg., 

 184-2, p. 398; smiu, 1852, p. 434; Treat, ins. inj. tfeg. {Flint ed), 1862, 

 p. ;>4s. 

 Cynips quercus-sculptus Bassett, Proc. Ent. soc Phil., 1863, v. 2, p. 324. 

 Cynips sculpta <>stcn Sacken, Proc Ent. soc Phil., 1865, v. 4, p. .Tit;. 

 Cynips quercus-sculpta Packard, 5tb rept. U. S. cut. comm., 1890, p. 114. 

 Amphibolips sculpta Gillette, Psyche, 1889, v. 5, p. 184. 



Packard, 5th rept. V . s. ent. comm., 1890, p. 105. 



Cook, Ohio nat., 1904. v. 4, p. 142, fiy:. 123. 

 Amphibolips nubilipennis Beutenmuller, Psyche, 11)08, v. 1."), p. In. 



A smooth, globular, fleshy, monothalamous gall, looking like a green 

 grape, translucent. 8-15 mm. in diameter. Difficult to preserve. Found 

 on red oak, Quercus rubra, scarlet oak, Q. coccinea and black oak, Q. 

 velutiua. Insects appear in June. 



Amphibolips primus Walsh. Acorn plum-gall. Fig. .">*--]<) 



Cynips quercus-prunus Walsh, Proc. Ent. soc Phil., ism, v. 3, p. 639. 



Osten Sacken, Proc. Ent. soc Phil., 1865, v. 4, p. 360. 

 Walsh ami Riley, Amer. cut., 1869, v. 1, p. Kit, fig. 80-81. 

 Amphibolips prunus Gillette, Psyche, 1889, v. 5, p. 1st. 



Packard, 5th rept. U. S. cut. comm.; 1890, p. 105, 115. 

 Beutenmuller, Bull. Amer. inns. nat. hist., 1892, v, 4, p. 252. 

 Cook, Ohio nat., 1904, \ . 4, p. 142, fig. 122. 



A subspherical, fleshy, solid, monothalamous gall. Smooth. Bright 

 red shading to yellow within. About 15-30 mm. in diameter. On the 

 cup of acorn of red oak, Quercus rubra, and scrub oak, Q. nana. Fairly 

 common. Falls readily from the acorn, so it may be frequently found on 

 the ground. The insect remains two years in the gall; emerges in the 

 spring. When the gall grows to large size the acorn remains small. 



Andricus piperoides Bassett. 



Andricus piperoides Bassett, Trans. Amer. cut. soc. 1900, v. 26, p. 314-31."). 



These galls are found in clusters of one to live dozen along the midrib, 

 looking as if they had burst out from the inside of the leaf or vein. Fach 



