ELM LEAP CURL AND WOOLLY APPLE APHID. 257 



1904. Schizoneura lanigera, Alwood, Wm. B. Circular in Relation to 

 Some Injurious Insects and Plant Diseases. Special Bulletin 

 (C. P. C. 45), Va. Exp. Sta. An excellent account of the 

 insect and its work, with figures. A study of the true sexes in 

 confinement is recorded followed by this significant statement: 

 "We have not thus far been able to trace the migrant forms 

 accurately, and watch the development of their young in normal 

 situations. They behave in a very aberrant manner, and we 

 are led to doubt. the statements that their young are deposited 

 in old colonies among the agamic forms. Definite search has 

 not revealed them, nor have we been able to find the sexual 

 egg in these old colonies. It is possible that there is here an 

 unsettled problem which may have important bearing upon 

 the distribution of the species." 



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. N. Y. St. Mus. Memoir 8: 



pp. 172, 177-178. Description of leaf curl, and life history 

 adapted from Riley. 



1905. Schizoneura rileyi, Felt, E. P. N. Y. St. Mus. Memoir 8: pp. 

 172, 192. Brief description of work and remedies. 



1907. Schizoneura lanigera, Smith, R. I. Bui. 23, Ga. State Board of 



Ent. An account after Alwood, with original photographs of 

 work. 



1908. Schizoneura lanigera, Gillette and Taylor. A Few Orchard Plant 



Lice. Bui. 133, Agr. Exp. Sta. of the Colorado Agr. College, 

 pp. 5-23. Ecological and economic account with original fig- 

 ures. 



1908. Schizoneura lanigera, Gillette, C. P. Journal of Economic Ento- 



mology, Vol. i, pp. 306-308. Of the migrants and true sexes 

 he writes: "We have had no trouble to get the alate females 

 to deposit the true sexual forms in confinement. We have 

 been utterly unable to keep these alate females upon the apple 

 trees to deposit their young. They seem possessed of a con- 

 trolling instinct to get away from the tree, so that the sexual 

 forms have always been deposited upon the walls of the breed- 

 ing cages Since writing the above, I have suc- 

 ceeded in obtaining numerous examples of light orange yellow 

 sexual females and the smaller dusky brown males, and a few 

 yellow eggs upon leaves and bark of twigs that had been en- 

 closed six weeks before in small cheese cloth sacks in the 

 orchard." 



1909. Schizoneura rileyi, Gillette, C. P. Journal EC. Ent. Vol. 2, p. 357. 



Suggests that it may be same species as Schizoneura ulmi 

 (americana}. "Of common occurrence at Fort Collins and 

 other places in Colorado. 



