[no name] Kellogg, 1904, Amer. Ins.: fig. 661.
Holcaspis douglasii Beutenmüller, 1909, Bull. Amer. Mus. Nat. Hist. 26:37, pl. 8 fig. 10-11.
Diplolepis douglasi Dalla Torre and Kieffer, 1910, Das Tierreich 24:369, 816. Fullaway, 1911, Ann. Ent. Soc. Amer. 4:338.
? Disholcaspis Douglasii Trotter, 1910, Boll. Lab. Zoöl. Portici 5:115, fig. 11, pl. 1 fig. 13-14.
Dryophanta douglasi Beutenmüller, 1911, Bull. Amer. Mus. Nat. Hist. 30:352. McCracken and Egbert, 1922, Stanford Univ. Publ. 3 (1):12. Essig, 1926, Ins. Western No. Amer.: 809, fig. 679.
Disholcaspis douglasii Felt, 1918, N.Y. Mus. Bull. 200:106 fig. 64 (10-11).
Disholcaspis douglasi Kinsey, 1920, Bufl. Amer. Mus. Nat. Hist. 42:398.
[no name] Leach, 1923, Oakland (Calif.) Tribune Mag., May 6, 1923: 11, fig.
Diplolepis Douglasi Houard, 1928, Marcellia 24:108, fig. 45.
FIG. 23. CYNIPS ECHINUS DOUGLASII ON QUERCUS LOBATA
Possible extension of known range shown by shading.