260 EXPERIMENT STATION RECORD. [Vol. 3S 



Citrus white fly (Aleyrodes citri; on lemons and oranges in the Province 

 of Mendoza, Argentina, R. Sanzin (Enol. Argentina, 1 {1915), No. 2, pp. JfZ, 43, 

 figs. 6; abs. in Rev. Apph Ent., Ser. A, 3 {1915), No. 11, pp. 69Jt, 695). -Tlv 

 citrus white fly has spread so rapidly in the Province of Mendoza that it is 

 now one of the worst pests of oranges and lemons ; not a single tree seems to be 

 free from its attacks, which cause withering of the leaves. 



Life history of Macrosiphum illinoisensis, the grapevine aphis, A. C. 

 Baker {U. S. Dept. Agr., Jour. Agr. Research, 11 {1917), No. 3, pp. 83-91, pis. 

 2). — In the present paper the author reports upon more recent studies than 

 those previously noted (E. S. R., 33, p. 857; 37, p. 358), in the first of which 

 the alternation in food plants was recorded, and gives an account of all the 

 forms of the species. This aphid, originally described by Shimer, from Illinois, 

 in 18GG under the name Aphis ilUnolsensis, and later by Thomas as Siphono- 

 phora viticola, is now known to occur in the District of Columbia, Georgia, 

 Indiana, Maryland, Missouri, Mississippi, North Carolina, New Jersey, New 

 York, Oklahoma, Pennsylvania, Texas, and Virginia, and what appears to be 

 the same species was taken on grape at Campinas, Brazil, in September, 1898. 

 It occurs abundantly on wild grape {Vitis spp.) in the southern United States 

 and often is quite destructive to cultivated varieties. 



The eggs, which are laid upon the twigs of Viburmim prnnifolinm, usually 

 being placed most thickly close around the buds, sometimes hatch during quite 

 cold weather in the third week in March and continue hatching until the early 

 part of April. The stem mothers on hatching out seek the buds and begin 

 feeding, and, when the flowers begin to open, may crowd down into the flower 

 clusters. They feed upon the stems of the individual blossoms, upon the twigs, 

 and somewhat upon the leaves. 



The spring migrants begin to appear in the second generation, although their 

 number is not abundant until the third generation and their production then 

 gradually decreases for several generations. The spring migrants fly lo wild 

 grapes and to grapes in the vineyards, the migration being at its height during 

 the first week in May. 



The summer wingless forms occur very abundantly throughout the summer. 

 They reproduce very quickly during the early summer and seven generations 

 have often reached maturity by July 1. Intermediates between the summer 

 winged and summer wingless forms have been found upon grape. Winged 

 forms are produced in every generation from the second onward, but fewer 

 winged line generations occur than wingless line generations. 



The fall migrants are produced upon the grapes during the early part of 

 October and are found upon the viburnum depositing young oviparous females 

 during the second week in that month. " The males are produced a little later 

 than the fall migrants, but can be found flying at the same time and may be 

 taken on the viburnums in company with the fall migrants. . . . The oviparous 

 female is a small, dark reddish aphis produced during the early part of Octo- 

 ber on the viburnum. It feeds upon the twigs and may be found until frost 

 kills all the insects. Each oviparous female lays three to six eggs close about 

 the buds or occasionally scattered along the twigs." 



Aphididffi of California, [XII], E. O. Essig {Univ. Cal. Pubs. Ent., 1 {1917), 

 No. 7, pp. 301-346, figs. 30). — This paper consists of descriptions of five new 

 species of plant lice from California and notes on other Aphididse, chiefly from 

 the campus of the University of California, Berkeley, Cal. See also a previous 

 note (E. S. R., 35, p. 56). 



Butterflies worth knowing, C. M. Weed {Garden City, N. Y.: Doubleday, 

 Page & Co., 1917, pp. XIII+286, pis. 48).— A popular account. 



