No. 2368. AMERICAN SUBTERRANEAN GALLS ON OAK— WELD. 205 



Length of six females, 3.4-4.1 mm. Average, 3.9 mm. One male, 

 3.2 mm. 



Type.— Cat. No. 22584, U. S. N. M. Six cotypes. 



Host. — Quercus gambelii Nuttall. 



Gall. — White, fleshy, fig-shapod, polythalamous, in clusters on 

 root at base of tree like those of T. radicola (Ashmead). They rot 

 after flies emerge. 



Type locality. — Santa Catalina Mountains, Arizona. Galls col- 

 lected June 27, 1918, on the Mount Bigelow trail near Soldier Camp 

 at an elevation of 2,350 meters. Many adults had already emerged, 

 and flies and pupae were 'found inside when galls were cut open. 

 One fly was captured on oak at Mount Bigelow lookout tower. 2 



Similar galls were seen in same locality on Q. reticulata Humboldt, 

 Bonpland, and Kunth, and adults were emerging on June 26, but 

 unfortunately none were preserved. 



10. TRIGONASPIS PUMILTVENTRIS (Bassett). 



Dryophanta pumiliventris Bassett, Trans. Amer. Ent. Soc, vol. 17, 1890, p. 69, 

 Male. — Dalla Torre, Cat. Hym., vol. 2, 1893, p. 54. — Dalla Torre and 

 Kiefper, Wytsman Gen. Ins. Cynipidae, 1902, p. 53, No. 34. — Beutenmtjel- 

 ler, Bull. Amer. Mus. Nat. Hist., vol. 20, 1904, p. 26; vol. 30, 1911, p. 354— 

 Thompson, Cat. Amer. Ins. Galls, 1915, pp. 8, 38. — Felt, Key to Amer. Ins. 

 Galls, N. Y. St. Mus., Bull. 200, 1918, p. 62. 



Diplolepis pumiliventris Bassett, Dalla Torre and Kieffer, Das Tierreich, 

 Lief. 24, 1910, p. 361. 



Belonocnema Colorado Gillette, Ent. News, vol. 4, 1893, p. 210, Female. — 

 Cockerell, Ent. Student, vol. 1, 1900, p. 9. — Dalla Torre and Kieffer, 

 "Wytsman Gen. Ins. Hym. Cynipidae, p. 80, No. 1; Das Tierreich, Lief. 24, 1910, 

 p. 725. 



Belenocnema Colorado Gillette, Beutenmueller, Bull. Amer. Mus. Nat. Hist., 

 vol. 26, 1909, p. 279.— Thompson, Cat. Amer. Ins. Galls, 1915, p. 36. 



Trigonaspis radicis Ashmead, Proc. U. S. Nat. Mus., vol. 19, 1896, p. 113, No. 1, 

 Male and female. — Cockerell, Ent. Student, vol. 1, 1900, p. 10. — Dalla 

 Torre and Kieffer, Wytsman Gen. Ins. Hym. Cynipidae, 1902, p. 56, No. 6; 

 Das Tierreich, Lief. 24, 1910, p. 397.— Thompson, Cat. Amer. Ins. Galls, 1915, 

 pp. 5, 42.— Felt, Key to Amer. Ins. Galls, N. Y. St. Mus., Bull. 200, 1918, p. 54. 



D. pumiliventris was described from males only and "from an 

 unknown source" although there is a specimen in the American 

 Entomological Society collection marked "cotype" bearing the 

 label "Ct." The galls are described as "shrunken and distorted, 

 probably soft and succulent when fresh, polythalamous, probably 

 on oak." The writer has not seen the types but this description fits 

 almost any preserved root gall of Trigonaspis very well. Bassett 

 thought, however, that they were produced in the axils of leaves. 

 Perhaps a branch had been inclosed in the sending to aid in the 

 determination of the host plant and he thought they had fallen from 



' Since the above was written the writer has seen in the United States Mational Museum collection a gall 

 cluster with three females and one male from Williams, Arizona, bred in June, 1901 (Barber and Schwarz); 

 ono gall and a male (with 15-segmented antennae) from Pecos, New Mexico, bred June 22 (M. Grabham); 

 and a female captured at light June 17, Pecos, New Mexico (Cockerell). 



