August, '15] 



DAVIDSON: WESTERN PLANT-LICE 



419 



ing as a reference: Third Kept. Inj. Ins. N. Y., p. 365, No. 69. In 

 this place Fitch merely briefly described, and recorded the injury to 

 plum by, BytJioscopus clitellarius Say, using that name. In 1890 Van 

 Duzee proposed a new name, provancheri, for Provancher's species 

 on the ground that the latter's name was invalid because the species 

 considered by Fitch was Thamnotettix clitellarius Say. I do not see 

 why this fact should invalidate Provancher's name, clitellarius. The 

 insect under consideration was first described by him under this 

 specific name and since the name clitellarius had not been used before 

 in the genus Idiocerus there is no reason why the species should not be 

 called Idiocerus clitellarius Provancher. In order to avoid confusion, 

 since the insect is well known under its present specific name, I have 

 not made the above change in the present paper. 



Bibliography 



OSBORN, H. 



1892. Catalogue of the Hemiptera of Iowa. Proc. Iowa Acad. Sci. 1:2: 126. 



1905. Jassidse of New York State. Ne^*York State Ent. Rept. 20 for 1904; 507. 



1915. Leafhoppers of Maine. Maine Agr. Exp. Sta. Bui. 238: 95. 

 OsBORN, H., and Ball, E. D. 



1898. A review of the North American species of Idiocerus. Proc. Davenport 

 Acad. Sci. 7: 12.5, 127-128. 



1898. Entomological Section. Iowa Agi\ Exp. Sta. Rept. for 1897: 120. 

 Prov.\ncher, L. 



1890. Petite faune ent omologi que du Canada 3: 288-289. Described as Bijtho- 

 scopus clitellarius Fitch. 

 Smith, J. B. 



1900. Insects of New Jersey, 2d ed. p. 92. 

 1910. Same, 3d ed., p. 102. 

 Van Duzee, E. P. 



1890. New North American Homoptera. Can. Ent. 22: 111. 

 1904. A Hst of the Hemiptera of Buffalo and vicinity. Bui. Buffalo Soc. Nat. 

 Sci. 5: 194. 



LITTLE-KNOWN WESTERN PLANT-LICE. I 



By W. M. Davidson, Scientific Assistant, Deciduous Fruit Insect Investigations, 



Bureau of Entomology'^ 



Phylloxera salicola Pergande 



Phylloxera salicola Pergande; Pergande, North American PhyUoxerinse Affecting 

 Hicoria (Carya) and Other Trees. Trans. Davenport Acad. Sci., IX. 



This species occurs in California on willow {Salix lasiolepis 

 Benth.). The infestations are mostly confined to the axils of the buds 

 on the twigs, but in one instance a heavy infestation occurred on the 

 bared roots of a willow growing on a stream bank. These roots were 

 about half an inch in diameter. The lice occurred in small cracks of 



^Published with the permission of the Chief of the Bureau of Entomology. 



