WOOLI^Y APHIDS OF THE ELM. 2/1 



1901. Schizoneura americana, Aldrich. Idaho Agric. Ex^. ota. Feby. 



Bui. 26, pp. 20-22. Records summer and fall (return) migra- 

 tion and describes true sexes. Suggests that alternate host 

 plant may be grass. 



1902. Schizoneura americana, Weed, C. M. Bui. No. 90. N. H. Agr. 



Exp. Sta. p. 37. Brief account and photograph of curled leaf. 



1902. Schizoneura americana, Cook, M. T. Galls and Insects Produc- 

 ing Them. Ohio Naturalist. Vol. II, No. 7, p. 265 and Fig. 12. 

 Discussion of structure of gall. 



1904. Schizoneura americana, Sanborn, C. E. (in part). Kansas Aphid 

 pp. 25-26. 



1904. Schizoneura americana, Cooley, R. A. loth Ann. Rept. Mont. 



Agr. Exp. Sta. pp. 43-45. Records this insect as a decidedly 

 obnoxious pest in some parts of Montana on Ulmus americana. 



1905. Schizoneura americana, Felt, E. P., (in part). N. Y. St. Mus. 



Memoir 8: pp. 172, 177-178. Description of leaf curl, and life 

 history adapted from Riley. 



1909. Schizoneura uhni L. {americana Riley) Gillette, C. P. (in part). 



Journal Ec. Ent. Vol. 2, p. 356. 



1910. Schizoneura americana. Patch, Edith M. (in part). Gall Aphids 



of the Elm. Me. Agr. Exp. Sta. Bui. 181, pp. 223-235. 

 1910. Schizoneura americana, Williams, T. A. (in part). The Aphididae 



of- Nebraska, p. 16. 

 1913. Schizoneura americana, Gillette. 25th Ann. Rept. of the Col. 



Agr. Exp. Sta. p. 30. "the leaf-rolling form" distinguished 



from "the form producing the rosette like cluster of leaves at 



the tip of elm twigs." 

 1913. Schizoneura sp. Patch. Ann. Ent. Soc. Am. Figs, i to 7. 

 1913. Schizoneura americana in part, of authors. Patch. Bui. 217. 



Me. Agr. Exp. Sta. p. 184. Habitat Key for Woolly Aphids of 



the Elm. 



Elm-Currant Aphid of Europe. 



Schizoneura uhni (fodiens). 



There is apparently little doubt that the literature for ulmi 

 in Europe is as mixed as that for americana in this country, both 

 being what is known as composite species. What ulmi of Linn. 

 was is perhaps past finding out but however that may be that 

 species which migrates to Ribes where it was known as fodiens 

 evidently has as good a right to the name as any, and most of 

 the recognizable figures are those of the Uluius-Ribes species. 

 That the life cycle of this leaf roller of elms (Ulnius scahra, U. 

 campestris, U. raccmosa and perhaps others) includes a resi- 

 dence on the roots of currants or gooseberries has been definitely 



