262 MAINE AGRICUIvTURAL EXPERIMENT STATION. I913. 



mon on VI. The antenna of this generation is practically the 

 same in appearance as that of the fall winged generation. (7-08). 



Fig. 122. The antenna of an apterous viviparous form giving 

 birth to the true sexes. (89-08). The relative length of the 

 joints are approximately the same as those of the pupa. 



The following collection notes are perhaps worth keeping as a 

 part of the discussion of this species : 



Aphid 69^05. September 2, 1905. Present in great numbers 

 in woolly clusters along trunk of small elms at Oro.no. 

 Apterous viviparous form and nymphs. This material was 

 determined by Mr. Pergande as Schizoneiira rileyi during the 

 winter of 1905-06. 



Aphid 95-06. August 4, 1906. Orono. Apterous and alate 

 forms present on trunk of young elm. 



Aphid 7-08. June 16, 1908. Woolly mass on trunk of small 

 elms. Winged viviparous forms just developing from pupse. 



Aphid 89-08. Sept. 23, 1908. Orono. Apterous viviparous 

 forms in woolly bunches on trunk and branches of young Ulmus 

 americana, causing knotty growth. The progeny of these apter- 

 ous forms were the true sexes, — apterous oviparous females 

 and apterous males. Eggs were plentiful under the bark. 



Aphid 52-13. June 14, 1913, Orono. Colonies in tender 

 places on trunk of young elms {Ulmus americana). Stem 

 mothers, nymphs and pupse. 



BIBLIOGRAPHY.* 



1868. (1869). Eriosoma nlmi Riley; Rept. Ins. Mo. i : 123, 124. 

 Account of work and original description of winged forms and 

 young lice. Remedies. 



1876-1879. Schisoneura rileyi Thomas. Trans. III. Hort. See. 1876, 

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

 Eriosoma ulmi Riley. Systematic discussion and description of 

 work. Description of insect quoted from Riley. 



1885. SchiBoneura rileyi Lichtenstein Monograph (528). 



1885. Schisoneura rileyi, Forbes. Rept. Ent. 111. 14 : 114. 



* No attempt has been made to give a complete bibliography for any 

 species in this paper. 



