258 MAINE AGRICULTURAL, EXPERIMENT STATION. IQI2. 



1909. Schisaneura lanigera, Gillette, C. P. Journal EC. Ent. Vol. 2, p. 

 356 and Fig. 15. "This is one of the most serious and generally 

 distributed insect pests of apple orchards in Colorado. 



1909. Schizoneura ulmi L. (americana Riley) Gillette, C. P. Journal 



EC. Ent. Vol. 2, p. 356 and Fig. 16. "This louse is a real pest 

 upon white elm nearly everywhere that this tree is grown in 

 Colorado." 



1910. Davis, J. J. A List of the Aphididae of Illinois with notes on 



some of the species. Jour, of EC. Ent. Vol. 3, p. 412. 

 Schizoneura americana. "Not infrequently injuriously abundant." 

 Schizoneura crataegi. "A serious pest of the hawthorns used in 



ornamental plantings in Chicago." 

 1910. Schizoneura americana, Patch, Edith M. Gall Aphids of the Elm. 



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

 1910. Schizoneura rileyi. Patch, Edith M. Gall Aphids of the Elm. 



Me. Agr. Exp. Sta. Bui. No. 181, pp. 235-238. 

 1910. Schizoneura americana. Williams, T. A. The Aphididae of 



Nebraska, p. 16. 

 1910. Schizoneura crataegi. Williams, T. A.- The Aphididae of 



Nebraska, p. 19. 



1910. Schizoneura lanigera. Williams, T. A. The Aphididae of Ne- 

 braska, p. 20. Mere mention. 



1910. Schizoneura rileyi. Williams, T. A. The Aphididae of Nebraska, 



pp. 20-21. "It causes a curling of the leaves similar to S. 

 americana, but the gfalls can be readily distinguished as those of 

 this species are much more tightly curled than those of 6". 

 americana. This latter species is ofteji to be found on the 

 same tree. They can be easily separated, as they differ in size, 

 antennae, venation and other minor points." 



1911. Schizoneura lanigera. Lohrenz, H. W. Jour. EC. Ent. Vol. 4, 



pp. 162-170. Ecological and economic study. 



I9i2a. Schizoneura lanigera. In Bui. No. 195 Me. Agr. Exp. Sta. Re- 

 corded on Crataegus and three species of mountain ash. 



I9i2b. Schizoneura lanigera (americana}. Patch, Edith M. Science, 

 Vol. 36, p. 30. Progeny of spring migrants from elm reared 

 on apple. 



If the elm species of America and Europe are the same, this 

 insect will revert to Schizoneura ulmi L. (lanigera Hausmann) 

 and according to European Aphidists ulmi migrates to the 

 roots of currant for the summer generations where it was 

 described by Buckton as Schizoneura fodiens. Are. there two 

 species in Europe known as ulmi, one migrating to currant 

 and the other to apple? 



1909. Schizoneura ulmi L. (S. fodiens Buckton). Tullgren. Aphi- 

 dologische Studien, pp. 163-169. 



