GALL APHIDS OF THE ELM. 20/ 



1893. Colopha ulmicola, Riley. Insect Life 5: 235. Footnote. Uhni- 



cola considered identical with eragrostidis.. 

 £895. Colopha ulmicola, Comstock. Manual p. 161. Brief description 



of gall. 

 1895. Colopha ulmicola, Cowen. Preliminary list of the Hemiptera of 



Colorado, p. 116. 

 X896. 1897. Colopha compressa, Cholodkovsky (Zool. Anz., 1896, No. 

 520, pp. 508-513, rev. in Zool. Centbl., 4 (1897), No. 

 26, pp. 918-919). Colopha compressa of Koch is re- 

 garded as identical with the American Colopha ulmi- 

 cola. The intermediate generation of Colopha com- 

 pressa was found on the roots of Aira cacspitosa. 

 i%g6. Colopha ulmicola. Smith. Economic Entomology, p. 132. Fig. 



96 (after Riley). 

 1897. Cocks-comb Gall, Harvey. Rept. Me. Agr. Exp. Sta. for 1897. 

 p. 173, mere mention. 



(1899. Sanderson. Amer. Gardening. 3 June). 



(1899. • Felt. Rural New Yorker. 18 July). 



1899. Colopha ulmicola, Johnson Bull. Div. Ent. U. S. Dept. Agric. 20 



(n. s.) ; 65 (Mentioned as injurious in Maryland). 



1900. Colopha ulmicola. Lugger. 6th Annual Report of the Ento'-^iolo- 



gist. p. 168. Fig. 135 (after Riley). Id. Bulletin No. 69. 

 Minn. Agric Exp. Station. 



1901. Colopha ulmicola, Hunter Aphid, of N. A., p. 80. Bibliography 



in part. 

 (^1901. Colopha ulmicola, Bruner, Nebr. Farm). 



1902. Colopha ulmicola. Cook. Galls and Insects Producing Them. 



Ohio Nat. Vol. II, No. 7, p. 265 and Fig. 13 a, b. Discussion 



of structure of gall. 

 4903. Colopha ulmicola, Cook. Galls and Insects Producing Tliem. 



Ohio Nat. Vol. Ill, No. 7, p. 425, and Fig. 50 a, b. Discu:;sion 



of structure of gall. 

 903. Saunders. So. Dak. Agr. Exp. Sta. Bull. 81. 



Description of Elm Coxcomb Gall. pp. 63-64. 

 .904. Colopha ulmicola, Beutenmiiller. Amer. 'Mus. Jour. Vol. IV. 



No. 4. Insect gall number. 1904, p. 91, p. 123. Fig. 83. 



1904. Colopha ulmicola. Cook. Galls and Insects Producing Them. 



The Ohio Naturalist. Vol. IV, No. 6. 



1905. Colopha ulmicola, Cook. The Insect Galls of Indiana. (From 



the 29th Ann. Rept. of the Dept. of Geol. and Nat. Resources 

 of Indiana. 1904, pp. 801-867), pp. 847, 848 and Fig. 40. Brief 

 description of gall. Bibliography in part and photo of galled 

 leaves. 



1905. Washburn loth Ann. Rept. of the State Ent. 



(Washburn 4th, pp. IV, V. Mention of gall and photograph 

 Fig. i). 



1906. Colopha ulmicola, Kellogg American Insects, p. 180. Brief de- 



scription of gall. 



