American Insect Galls: Thompson • 7 



Cynips chrysolepidicola Ash. '97, p. 124, 9 , Q- chrysolepis, Cal. 



Jan., Feb. Swelling surrounding twig. Like meduUce. 

 *Neuroterus longipennis Ash. '87b, p. 140, 9 , Q. laurifolia, Fla. 



May. Oblong irregular swelling surrounding base of twig. 

 Andricus wheeleri Beut. '07, p. 464, pi. 37, fig. 7-9, 9 , ?, Ariz. 

 Resembles medullce. 



(C) Larval cells each surrounded by a tube of cellular tissue, differentiated from 

 the general substance of the gall. These tubes may project from the surface m the 

 matured gall. 



(a) Tubes never project. 



Callirhytis suttonii Bass. '81, p. 54-56 (Cynips), 9 , Cal. 

 The bark always covers the tubes. 



(6) The tubes project hke horns or spines. 



Callirhytis cornigera 0. S. '62, p. 251-253 (Cynips), Q. palustris, plate 1, 316, D. C; 0- S '65, 

 p 358 9 • Packard Q. imhricaria, Mo.; Q. palustris, N. J.: Bass. '64:,Q.ihcifoha. 

 Conn.: Beut. Q. palustris, Q. ilicifolia, Q. nigra, N. Y.: Gill. '89, Q. rubra, Mich.: 

 0. S. '61, p. 53, Pin oak; Q. nigra, Mass. 

 Gall forms in May. 

 Andricus clavigerus Ash. '81, p. XXVI-XXVII (Cynips), 9 , Q. laurifolia, Fla. 

 May 3. Tubes secrete a honey-like liquid. 



6. Polythalamous woody swelling at base of twig: excentric on twig— (grade to last 

 group)— 



CaUirhytis aquatics Ash. '87b, p. 144, 9 , Q. aquatica, Fla. 



Spring. 

 Andricus davisi Beut. '07, p. 463-464, pi. 37, fig. 1-6, cf 9 , Q. nana, N. J. 



Summer, spring. Coalesce. 



7. Pustular elevations of the bark, often enlarging the twig— 



Neuroterus rileyi Bass. '81b, p. 149-150 (Cynips), 9, Q. castanea. Conn. Late I\Lay. Riley 

 '80, Q. castanea, Ohio: Cook '05, Q. prinus, Ind.: Packard Q. castanea, Ohio, Mo.; 

 Q. prinoides, Mass. 

 Gall forms in May (confluent), plate 3, 173. 



8. Monothalamous terminal enlargements or club-galls of twigs— 



Callirhytis clavula 0. S. '65, p. 351, proposed name for—: Bass. '64, p. 685-687, 9, '•Cynips 

 tuber" Fitch, Conn.; =0. S. '61, p. 70-71, No. 25; =(?) O.S. Cynips pheUos; O.b. 

 '61, p. 70, 9 , Q. phellos, D. C, 9 . Late June; = (?) Cynips arbos Fitch, 5 Rept., p. 

 809-810, 9 Q. alba, N. Y., =Ceroptres: Gill '89, Q. alba. Iowa, IMich.: Beut. Cat. 

 '04, Q. alba, N. Y.: Cook '05, Q. alba, Ind.: Packard Q. alba, Pa., Mo.; Q. alba, Mass., 

 R. I. 

 Terminal club, plate 3, 142. 

 Andricus howertoni Bass. '90, p. 82-83, 9 , N. Mex. 



Terminal club. 

 CaUirhytis similis Bass. '64, p. 685- (Cynips), cf 9 , Q. ilicifolia, Conn.: Harvard Coll., N. Y.: 

 Beut. Cat., Q. nana, Q. ilicifolia, N. J.; (?. ilicifolia, Q. stellata, Mass., R. I. 

 Terminal or not terminal, plate 3, 45. 



