2C» Bulletin 2: Springfield Museum. 



Bassett, Proc. Ent . soc. Phil., 1.-63, v. 2, p. 332-333; Can. ent., 7873, v. 5, 



p. 91-94; 1S77, v. 9, p. 121. 

 Riley, Amer. nut., 1H73. v. 7, p. 519, note. 

 Howard, Psyche, 188-2, v. 3. p. 328-329. 

 Packard, 5tli r«i>r. V. s. ent. comm., 1890, p. 11. 

 Andricus (Callirhytis) operator Bassett. Amer. nat., 1X82, v. 16, p. 246. 



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

 Packard, 5th rept. U. S. ent. comm., 1890, p. 105. 



This species was the one from which the combined observations of 

 Bassett and Riley proved the interesting fact of alternating generations in 

 Cynipidae. 



The spring form consists of a woolly mass on the staminate aments, 

 2-4 cm. in diameter, dull yellow in color, from which emerge numerous 

 insects of both sexes. The second form, producing an agamic female, 

 consists of a monothalamous, irregular gall growing out from the cup and 

 pressed close to the side of the acorn. Smooth, light brown, the larval 

 cell nearly filling the gall. About 8 mm. long, 5 mm, wide. On scrub 

 oak, Quercus nana. Spring form abundant and noticeable. 



Callirhytis palustr is Osten Sacken. See p. 21-22. 



Oallirhytis similis Bassett. Scrub-oak club-gall. Fig. 45. 



Ci/nipx i/in rcus-similis Bassett, Proc. Ent. soc. Phil., 1864, v. 3, p. 685. 

 Cyrvips similis Osten Sacken, Proc. Ent. soc. Phil., 1865, v. 4, p. 341. 

 Andricus {Callirhytis) similis Bassett, Amer. nat., 1882, v. 16, p. 246. 



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



Packard, 5th rept. IT. S. ent. comm., 1890, p. 105. 



Beutenmiiller, Bull. Amer. mus. nat. hist., 1892, v. 4, p. 255, pi. 11, 

 fig. 2. 



Club-shaped, woody gall at end of twig. Rather blunter than gall of 

 Callirhytis clavula. Polythalamous. A few leaves grow from it. Green, 

 turning brown ; surface looks as if covered with dust. 2-4 cm. long. 

 Rather common on scrub oak, Quercus nana. 



Callirhytis tuberosa Bassett. 



Andricus (Callirhytis) tuberosa Bassett, Trans. Amer. ent, soc, 1900, v. 26, p. 311. 



A tuberous gall on one side or surrounding a young shoot near the tip. 

 Smooth at first, but wrinkling and roughening later. The same color as 

 the twig, quite green early in the season. 8-15 mm. long, 7-12 mm. wide ; 

 rising abruptly from the twig. Monothalamous, the cell-walls 2-3 mm. 

 thick ; corky, the bark showing distinctly. The white larvae have par- 

 tially buried themselves in the wall in places. September. On scrub oak, 

 Quercus nana, 



Cynips? aspera, n. s. Fig. 22, 42. 



An ovate, roughened, one-celled bud-gall, usually terminal and solitary, 

 occasionally lateral, or in pairs. From the slightly prolonged tip run down 

 two ridges nearly to the base of the slightly flattened, asymmetrical gall. 

 About 12 mm. long, 7 nun. wide. Green, sometimes dotted with red. 

 The larval cell is lield in place by radiating fillers. On seruli oak. Quercus 

 nana. September. 



