20 Bulletin 2: Springfield Museum. 



is smooth, spherical, attached by a small stein, 3-8 mm. in diameter, 

 monothalamous, grayish or tinged with red. They fall to the ground, 

 where the larva completes its metamorphosis, which sometimes requires 

 two years. Insects in second summer. Leaves of red oak, Quercus 

 rubra. Not rare. 

 Andricus singularis Bassett. Small oak apple. 



Cynips quercus-singularis Bassett, Proc. Ent. soc. Phil., isc>3, v. 2, p. 326. 



Cynips singularis Osten Sacken, Proc. Km. soc. Phil., 1865, v. 4. p. 355. 



Cynips nubilipennis Fitch (non Harris). Osten Sacken, Proc. Ent. sue. Phil., 1865, v. 4. p. 



340, 348. 

 Andricus singularis Bassett, Amer. nut.. 1882, v. 16, p. 346. 



Ashmead, Trans. Amer. cut. sue.. 1885, v. 12, p. 295. 



Gillette, I'syche, 18-9, v. 5, p. 186. 



Packard, 5th rcpt. V . S. cut. comm.. 1890, p. 105. 



Hi ■ ii t en miiller, Bull. Amer. inns. uat. Inst.. 1892, v. 4. p. 256; pi. II, fig. 4. 



Spherical, smooth, thin-walled gall, projecting on both sides of the 

 leaf. About 1 em. in diameter. The larval cell held in place by radiating 

 fibers. Green becoming brown and brittle. Common on red oak, Quercus 

 rubra. Insects in July. 



( 'allirhytis punctata Bassett. Knot oak-gall. 



Cynips quercus-punctatq Bassett, Proc. Ent. soc. Phil., lsr>3, v. 2, p. 324. 

 ( ynips quercus-podagrae Walsh, Proc. Ent. soc. Phil., 1864, v. 2, p. 492. 

 ( ynips punctata, Osten Sacken, Proc. Ent. soc. Phil., 1865, v. 4, p. 341, 358. 

 Andricus (Callirhytis) punctata Bassett, Amer. nat., 1882, v. 16, p. 246. 



Ashmead, Trans. Amer. cut. soc. 1885, v. 12, p. 294. 



Packard, 5th rcpt. I '. s. cut. comm., 1890, p. 105. 



Beutenmiiller, Bull. Amer. mus. nat. hist., 1892, v. t. p. 253-254. 



Jarvis, 38th aim. rcpt. Ent. SOC. Ontario, 1907, p. 91, fig. 

 . Ind/ricus punctatus Gillette, Psyche, 1889, v. '<. p. 185. 



An irregularly spherical, rough, woody gall, constricted at its union 

 with the branch which it usually surrounds. Polythalamous. Color of the 

 branch, but turning almost black with age. Varying greatly in size ; 

 sometimes several are united and masses the size of the fist are formed 

 which impair the appearance of the tree. On black oak, Quercus velutina, 

 and red oak, Q. rubra. Common. Reported on scarlet oak, Q. coccinea. 



Cynips? constricta, n. s. Fig. 24. 



A smooth, fleshy, one-celled gall occurring scattered on the under side 

 of the leaf, along midrib or larger veins. Urn-shaped. Green with red 

 tips, shiny. 4-0 mm. tall, 3-4 mm. wide. On red oak, Quercus rubra. 



September. 



Cynips decidva Bassett. Fig. 54. 



Cynips quercus-decidua Bassett, Proc. Ent. soc. Phil., 1864, \ . 3. p. 689. 



Riley, Amer. ent., 1880, v. 3, p. 27s. 



Packard, 5th rcpt. U. S. cut. comm., 1890, p. 115. 



Clusters of seed-like galls, often thirty or more, growing 1 on the mid- 

 rib of leaves. Smool h, monothalamous, larger at tip where there is a slight 

 riii".'. About 6 mm. long. Greenish-white, looking as if they had burst 

 the covering. Full grown in October, but apparently the larvae grow 

 after the galls have fallen to the ground. On red oak, Quercus rubra. 



