270 Maine: agricui.turai, expe;riment station. 1913. 



number of annulations of the big thrifty early ones from the 

 juicy leaf and the last individuals to develop in the drying roll 

 would seem suggestive of the physiological effect of the habitat 

 on the size of the individual and the character of the antenna. 

 (68-13.) 



The migration of this winged generation from the leaf curl 

 is a matter of frequent record and easy to observe. Where it 

 goes and what the food plant of its summer progeny is still 

 unknown. During 1912 a few individuals of this species were 

 taken in the open on Pyrus leaves together with the rosette 

 dweller, but a further acquaintance with the elm Schizoneurans 

 leads me to believe that they had merely alighted there accident' 

 ally on the way to their proper host. 



A fall migrant is found on the elm whose antenna accords 

 with that of the spring migrant of this species and is probably 

 the return migrant. Neither the spring nor fall winged forms 

 have the antenna of lanigera and the wax glands of the second 

 generation distinguish it from that Ulmus-Pyrus species. 



BIBLIOGRAPHY. 



1879. Schisoneura americana in part. Riley. Bui. U. S. Geo. and Geo- 

 graph. Survey, Vol. V, No. i, pp. 4-9 and Plate I and Fig. 2. 

 description of seven generations on elm. Riley evidently in- 

 cluded both the rosette and roll species under one name as his 

 followers have for years. Whether he included more than 

 two species it would be difficult now to ascertain. His figure 

 oif the antenna of the winged form with VI long and heavily 

 annulated is evidently either an error or else this represents 

 some elm Schizoneuran not at present known. 



879. Schizoneura americana in part, Thomas (in part). Report of 

 the State Entomologist 111. VIII, p. 202. Quotes Riley's 

 description. 



887. Schizoneura americana, Oestlund, O. W., (in part). Aphid. 

 Minn. p. 27. Description of winged form and pseudo gall. 



890. Schizoneura americana Packard, (in part). Fifth Rept. U. S. 

 Entom. Com. p. 279. Extract from Riley Bui. U. S. Geol. and 

 Geograph. Survey, Vol. V, No. i. 



897. Schizoneura americana, Gillette, C. P., (in part?). Bui. Div. 

 Ent. U. S. Dept. Agric. 9 (n. s.) : 78-79. Description of work. 



900. Schizoneura americana, Lugger, (in part). Bui. No. 69. Minn. 

 Agr. Exp. Sta. Id. 6th Ann.. Rept. St. Ent. of the St. Exp. Sta. 

 Univ. of Minn. pp. 168, 169. Fig. 148 after Riley. 



