60 EXPERIMENT STATION RECORD. [Vol.40 



report of investigations conducted in continuation of those previously noted 

 (E. S. R., 38, p. 57; 39, p. 763). 



The authors find that Plesiocoris rugicollis causes marked damage to the 

 leaves, shoots, and fruit and is responsible for most of, if not all, the damage 

 in the Wisbech district of England. "Atractotomus niali, Orthotylus margi- 

 nalis, and Psalhus ambiguus, although they feed on the juices of the apple, do 

 not cause any apparent damage to the varieties badly marked by P. rugicollis. 

 In no case have we found either of these three species causing any visible 

 damage to apples." Studies of P. rugicollis are reported upon at some length 

 and brief accounts are given of 0. marginalia, ]'. anthiguus, and A. mali. 



Further observations on the capsids which attack apples, F. K. Pktiier- 

 BBIDGE and M. A. Husain (Jour. B&. Agr. [London], 25 [IMS), \o. 1, pp. 5'f-58, 

 pi. 1). — A report of work, a more detailed account of which is above noted. 



New Aphidinae of Japan, S. Matsi-mura (Trans. Sapporo Xat. Hist. Soc, 

 7 (1918), Xo. 1, pp. 1-22. pi. 1). — This paper, which supplements that previously 

 noted (E. S. R., 38, p. 463), gives descriptions of five new genera < Metaphis, 

 Yezosiphum, Acanthaphis, Sappaphis, and Myzopsis) and L'i2 new Bpedea 



Life history of Pemphigus populi-transversus, T. H. Jones (Jour. Agr. Re- 

 search [U. 6.J, U f (1918), No. 13. pp. 577-594. l'l*. 5, fig. 1).— This is a report of 

 studies conducted by the Bureau of Entomology of the U. S. Department of 

 Agriculture in Louisiana. 



It is first pointed out that prior to the publication of the present article there 

 was nil published record of any species of Pemphigus as occurring on crucifers in 

 the United States, although collected from turnip roots in Texas by 1'addock 

 in 1914. from watercress in Colorado by Bragg, and from curly turnip (Brassica 

 rapa I In Mississippi. The species which causes galls on the leaf petioles of some 

 of the poplars or cottonwoods was first described by Riley in 1^79. Its first 

 collection from the roots of Cruciferte in Louisiana was made by Tucker of the 

 Louisiana Stations in November, 1914, having been taken on cabbage roots in 

 Tangipahoa Parish. Shortly afterwards it was collected by the autlior at 

 Baton Rouge. The experiments here described led to the conclusion that the 

 form which causes galls on the leaf petioles of some of the poplars or cotton- 

 woods (Populus spp. ) and that which feeds on the roots of crucifers represent 

 the same species. This species has been recorded as occurring on poplar in 

 California, Texas, Colorado, Kansas, Nebraska, Missouri, Iowa. Minnesota. 

 Illinois, Indiana, New York, and Massachusetts, and has also been collected in 

 Wyoming, Arizona, Wisconsin, Michigan, Ohio, and Florida. Four species of 

 the genus Populus (P. balsamifcra, P. monilifcra, P. trichocarpa, and P. fre- 

 montii) have been mentioned as hosts. 



The formation of galls, dates when galls are found at Baton Rouge, percentage 

 of leaf petioles showing galls, dates when winged migrants are found in galls 

 dates when winged migrants leave galls, and number of wingless viviparous 

 females to which winged migrants give birth are considered by the author. 



As regards the effect upon the plant, it is stated that a slight <>r moderate 

 Infestation of the roots of crucifers does not usually affect the appearance of 

 the plant, but a severe infestation of the roots is manifested by a wilted condition 

 of the leaves. Colonies may be found upon any portion of the root system but 

 the small rootlets appear to be preferred. At Baton Rouge the subterranean 

 forms apparently cause more severe injury to turnip than to any other cultivated 

 cruciferous crop that has been under observation. The planting of rape ami 

 kale at the live-stock experiment farm at Jeauerette, La., is said to have been 

 abandoned on account of this root louse. 



" Wingless specimens of the genus Pemphigus have been taken in Louisiana 

 from the roots of the following Crucifers? : Cabbage, turnip, mustard i />'. nigra), 



