226 THE CANADIAN ENTOMOLOGIST 



In 29th report, p. 17. President's Annual Address delivered 

 on the occasion of the 25th Anniversary of the Montreal Branch. 



In Entomological News, Vol. XVIII, p. 420, is an able article 

 on Thecla calanus and T. edwardsii (with the footnote that it was 

 read before the Ent. Soc. of Ontario at Guelph, July 4, 1907). 



In Vol. VII, 172. On occurrence of Chionobas larpeia in North 

 America. 



Several short items also appear, including one regarding 

 Erebia discoidalis in the first volume, p. 146. 



NEW OR LITTLE KNOWN SPECIES OF APHIDIM:. 



BY JOHN J. DAVIS, BUREAU OF ENTOMOLOGY, WASHINGTON, D. C. 



(Continued from p. 173.) 



Symdobius albasiphus, n. sp. 



This very interesting plant-louse was first taken by the writer 

 on white oak (Querats alba), at Elgin, Illinois, August 30, 1910. 

 The past year (Sept. 10,1913), the wingless females were found 

 quite common on white oak at Lafayette, Indiana, and October 8, 

 1913, at the same place, the wingless oviparous females and winged 

 males were observed. In all cases the plant-louse was found on 

 the leaves near the leaf petiole, usually on the under surface of the 

 leaf, and invariably attended by the ant, Cremastogasler lineolata 

 Say.* We have found only the apterous forms of the viviparous 

 generation, but Mr. J. T. Monell collected three winged individuals 

 of this species on oak petioles at Mi»e la Motte, Missouri, June 28, 

 1890, and our description of this form is taken from these speci- 

 mens and the notes accompanying them, through the kindness of 

 Mr. Monell. I have recently received an oviparous female of this 

 species from Mr. A. C. Baker, accompanied by the following note: 

 "On white oak, Vienna, Va., Oct. 4, 1912. Ants had built a mud 

 nest over the aphids to protect them. This nest was on the upper 

 side of the leaf, covering nearly half of it." The first, and so far 

 as we are aware, the only published reference to this species is by 

 Dr. Thomas in the Eighth Report of the State Entomologist of 

 Illinois (1879, p. 118), where the apterous females are described as 

 Lachnus quercijolia Fitch, from specimens collected on white oak 



*Kindly determined by Dr. W. M. Wheeler. 

 July, 1934 



