ELM hUAt' CURI. AND WOOLLY APPLE APHID. 255 



Synonymy and Literature. 



A complete bibliography for this species is not desirable here 

 as the accounts which throw original light upon the life his- 

 tory would be lost in a mass of publications compiled for eco- 

 nomic purposes. 



1802. Aphis lanigera, Hausmann, Beitrage zu den materialien fiir eine 

 kunftige BearbeitUng der Blattlause. lUigers Magazine. T. I. 

 Coccus mali., Bingley (Thomas 1879, p. 126). 

 Eriosoma mnli. (Leach MSS.) Samouelle. (Thomas, 1879, p. 



126). 

 Myzoxylus mali. Blot. (Thomas, 1879, p. 126). 

 1841. Eriosoma (Aphis) lanigera^ Harris. Report on the Insects of 



of Mass. injurious to vegetation, p. 193. 

 1841. Schisoneura lanigera, Hartig, Germar's Zeit. Ent. Ill, p. 359. 

 1851. Eriosoma pyri, Fitch. Fourth Report of the N. Y. State Cabinet 



of Nat: Hist., A. D. 1851, p. 68. 

 1856. Pemphigus pyri. Fitch. First Report on the Noxious, Beneficial 

 and other Insects of the State of New York, p. 5. An account 

 of the work upon the roots and a description of the young 

 nymph and winged individuals, the latter evidently either with 

 abnormal venation or an accidental migrant- of a different 

 species as this form is described with the venation of a Pem- 

 phigus. 

 1858. Pemphigus americanus? Walker. List of the specimens of 



Homopterous Insects in the collection of the British Museum. 

 1862. Eriosoma {Aphis) lanigera, Harris. Insects Injurious to Vege- 

 tation, p. 2^2, 

 1869. Eriosoma {Pemphigus) pyri, Riley. Insects of Missouri I, p. 118. 



Economic account of work on apple roots. 

 1869. Eriosoma itlmi, Riley. Insects of Missouri I, p. 123. Descrip- 

 tion of winged forms and nymphs, and account of work on 

 elm bark. 

 1879. Schisoneura americana, Riley. Bui. U. S. Geol. and Geograph. 

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

 tion of seven generations on elm, with an account of the work 

 on elm. 

 1879. Schizoneiira americana, Thomas, (III), Report of the State 

 Entomologist ; III. VIII, p. 202. Quotes Riley's description of 

 seven generations, and concludes (p. 204) : "This as admitted 

 by Professor Riley is very closely allied to Schisoneura ulmi, 

 Linn, and it is doubtful whether it should be considered as dis- 

 tinct." 

 1876-1879. Schisoneura rileyi, Thomas. Trans. 111. Hort. Soc, 1876, 

 p. 191; id. Rept. Ent. 111. 8: 136, 137, 1879, nom. nov. for 

 Eriosoma ulmi Riley. Systematic discussion and descrip- 

 tion of work. Description of insect quoted from Riley. 



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