556 EXPERIMENT STATION RECORD. [Vol.43 



An examination of the orchard in April showed many terminal leaves to 

 have been curled and distorted by the black citrus aphis, which was highly 

 parasitized. The citrus leaf roller (Eantis thraso Hubu.) was abundant In 

 May. A fulyorid leaf hopper (Botliriocera sp.) was common on grapefruit 

 twigs. 



The insects of the evening primroses in New Jersey, E. L. Dickeksox 

 and H. B. Weiss (Jour. N.'Y. Ent. Soc, 28 {1920), No. 1, pp. S2-74, pis. 3).— 

 This is a report of observations of the evening primroses (Qilnothera spp.) in 

 various parts of New Jersey. 



Insect and fungus pests of basket willows {Bd. Agr. and Fisheries [Lon- 

 don], Leaflet 301 (1918), pp. 11, pis. 4)- — Brief accounts are given of the more 

 important enemies of basket willows in England and means for their control. 



Insects attacking farm animals, G. Maheux (ilin. Agr. Prov. Quebec, Bui. 

 67 (1920), pp. 29, figs. 2^).— This is a popular account. 



The colonizing reproductive adults of termites, T. E. Snyder (Proc. Ent. 

 Soc. Wash., 22 (1920), No. 6, pp. 109-150). 



Zoraptera not an apterous order, A. N. Caudell (Proc. Ent. Soc. Wash., 

 22 (1920), No. 5, pp. 8J,-97. figs. 5). 



The paddy bug (Leptocorisa varicornis F.), J. C. Hutson (Trop. Agr. 

 [Ceylon], 54 (1920), No. 6, pp. 363-366, fig. i).— This is a summary of informa- 

 tion on the most serious insect enemy of paddy in Ceylon. 



On the biology of Aphis avena? Fab. in the Southeast, with causes con- 

 ducive to the unusual abundance of this species as well as Toxoptcra 

 graminum Rond. during certain seasons, P. Luginbill (Ann. Rpt. Commr. 

 Agr., Com. and Indus., S. C, 16 (1919), pp. 219-229, figs. 7/).— This is a report 

 of studies conducted in the vicinity of Cohnnbia, S. C, with a view to determin- 

 ing the number of generations occurring annually, wliether or not oviparous 

 forms appeared at any time duiing the year, comparative length of life of the 

 individuals constituting the generations, and the number of young produced by 

 each indivdual. The investigations were conducted in connection with those of 

 T. graminum previously noted (E. S. R., 39, p. 559). 



The methods of study employed and the feeding habits of A. avenw as com- 

 pared with T. graminum are first considered. The life history studies have 

 shown that the average length of life of the individuals born during the summer 

 months is about 22 days, increasing to 25 days for those born during the fall 

 months and 75 days for those born during the winter months. The average 

 number of young for an individual during the summer months is about 33 days, 

 and for the winter months 38 days. The time elapsed between the birth of the 

 individuals and the commencement of reproduction varied very greatly. Repro- 

 duction may follow within 24 hours after the last molt has occurred, while 

 during the winter a maximum of 36 days and a minimum of 15 days were 

 obtained. Approximately 24 generations for the calendar year were obtained 

 for the latitude of Columbia, no oviparous form appearing in this series. 



The influences conducive to the unusual abundance of aphids during certain 

 seasons in the Southeast are discussed at some length. Graphs are given which 

 show the comparative length of life of individuals, the comparative number of 

 young, period in days between birth and beginning of reprodiiction, mean tem- 

 peratures from September to March, and minimmn temperatures from Septem- 

 ber to March. 



An infestation of the white-pine aphid, H. B. Pierson (Psyche, 27 (1920), 

 No. 2-3, pp. 62, 63). — The author records an infestation at Petersham, Mass., 

 of white pine 40 to 50 years old by Lachnus strohi Fitch, in which infested trees 

 averaging about 14 in. in diameter succumlied to the attack. 



