479 



Britton (W. E.). Swarms of Aphids. — Jh Econ. Entom., Concord, 

 N.H., xii, no. 4, August 1919, p. 351. 



On 23rd and 24th June Aphids, subsequently identified as Calaphis 

 betulaecolens, Fitch, appeared in New Haven, Connecticut, in such 

 numbers as to be a nuisance to pedestrians and vehicles. They 

 had probably migrated from birch trees on the outskirts of the town. 



WoDSEDALEK (J. E.) & Smith (R. H.), Zoology and Entomology. — 

 Univ. Idaho Agric. Expt. Sta., Moscow, Bull. 113, December 

 1918, pp. 32-34. [Received 3rd September 1919.] 



Observations continued in 1918 with regard to the clover aphis 

 [Aphin bakeri, Cowen] show that it survives the winter in various 

 stages of development in the clover crowns. Except during a few 

 weeks in October and November, parthenogenesis is the normal 

 method of increase. The reproductive period of each individual 

 lasts about nineteen days, an average of 81 young being produced. 

 About October and November certain winged forms migrate to apple 

 and other fruit trees. They feed on the leaves of these trees and 

 give rise to sexual individuals. After mating each female lays two 

 eggs on the young twigs. These hatch early in the spring and feed 

 and multiply on the leaves. Winged forms return to the clover. 

 The majority of the Aphids, however, continue to multiply partheno- 

 genetically during the winter on clover. 



The remedial measures advocated are the destruction of hibernatirg 

 places by close grazing, using sheep on clover fields, orchards, ditch 

 banks and waste places, late spring grazing by sheep of both red and 

 alsike clover, flooding infested clover fields with irrigation water 

 and spraying alsike clover, 



Ritchie (A. H.). Potatoes attacked by Insects. — Jl. Jamaica Agric. 

 Soc, Kingston, xxiii, no. 7, July 1919, p. 221. 



An outbreak of Laphygma frugiperda (fall army worm) is reported 

 on potatoes. Dusting with lead arsenate diluted with two or three 

 times its volume of ashes or lime is advised against it. 



Blackmore (E. H.). Entomology. — Rept. British Columbia Provin- 

 cial Mus. Nat. Hist., 1918, Victoria, 7th March 1919, pp. 

 T.6-T.13, 2 plates. 



A very heavy infestation of tent caterpillars, Malacosoma pluvialis, 

 Dyar, occurred during the year in British Columbia. All kinds of 

 fruit and shade-trees were attacked. The butterflies, Aglais cali- 

 fornica, Bdv., and Vanessa calijornica, were also present in large 

 numbers, as well as the alfalfa-looper Phytometra (Aiitographa) cali- 

 fornica, Edw. 



Hemerocampa vetusta gulosa, Hy. Edw., is recorded for the first 

 time from British Columbia. This moth caused serious damage to 

 Douglas fir, on which both full-fed larvae and imagines were taken 

 on 6th August, proving it to be double-brooded. 



The apple-maggot fly, Rhagoletis pomoneUa, has been found, but 

 so far there is no evidence of it attacking the apple in British Columbia, 



