92 THE CANADIAN ENTOMOLOGIST 



We also have viviparous lice in the collection taken as follows: 



Russia, 1893, N. Cholodkovsky. 



Mass., 1909, T. H. Morgan. 



Webster, Mass., June 19, 1909, L. C. Bragg. 



Lyons, Colo., June 11, 1916, L. C. Bragg. 



Fort Collins, Colo., June 11, 1917, L. C. Bragg. 



Dr. Stevens, in her paper, referred to above, states that Kyber. 

 in his paper on "Einige Erfahrungen und Bemerkungen iiber Blatt- 

 lause in Germar's Magazin der Entomologie, 1815, records find- 

 ing sexual forms of what was, undoubtedly, this species, on willow 

 in June, and she also reports taking the sexuales on June 29 at 

 Harpswell, Maine. 



Aphis theobaldi, n. sp. 



Aphis saliceti Kalt., Theobald, Rep., on Ec. Ent. for 1912, 

 p. 84. 



The presence of the pre-caudal spine, or produced eighth 

 abdominal tergite,and the cylindrical cornicles, are characters that 

 readily separate this species from the others inentioned in this 

 paper. It seems to be the species described and figured by Theo- 

 bald in his Report on Economic Zoology for 1912, page 84, and 

 Plate XIII, and Figure 24. The species is one having alternate 

 food habits, and may be described from our material as follows: 



Alate Viviparous Female. 



From specimens mounted in Canada balsam. Head, thorax, 

 antenna?, tarsi and distal ends of tibise, black or blackish; abdo- 

 men greenish or yellowish ; cornicles cylindrical, .28 long, or about 

 as long as the spur of the antennse and yellowish in colour; cauda 

 barely one-half as long as the cornicles; a short, blunt tubercle 

 on the median line of the 8th abdominal tergite; antennae nearly 

 reaching the base of the cornicles; 1.13 long; joint III with about 

 40 strong tuberculate sensoria and longer than joint VI with the^ 

 spur; spur as long as joints IV, V and VI combined; length of 

 body, 1.50; wing venation normal. 



Described from specimens taken at Geneva, N.Y., July 1, 

 1909. 



Apterous Viviparous Female. 



From specimens miounted in Canada balsam. Colour, a 

 uniform yellowish brown, probably green or yellowish green in 



