545 



'Chapmax (G. H.). Mosaic Disease of Tobacco. — Mass. Agric. 

 Expt. Sla., Amherst, Bull. no. 175, Mavl917, pp. 73-117, 6 plates. 

 [Received 17th October 1918.] 



The fact that many fungous and bacterial diseases are often trans- 

 mitted by insects, as well as other agents, has been long known and 

 thoroughly established, the mosaic disease of tobacco being carried 

 by Aphids, especially Macrosiphum tahaci, Perg. [see this Preview, Ser. 

 A, i, p. 19, and v, p. 577]. Observations in the field have not shown 

 that this disease is communicated by biting insects such as the tobacco 

 horn-worm [Protoparce quimpiemacuhta], grasshoppers, and a flea- 

 beetle, nor has it Deen possible to demonstrate positively that white- 

 flies [Aleurodes] are active agents in the spread of the disease. 



Regan (W. S.). Potato Plant Lice and their Control. — Mass. Agric. 

 Expt. Sta., Amherst, Bull. no. 177, October 1917, pp. 135-1 46. 

 [Received 17th October 1918.] 



Macrosiphiwi sokinifolii, Ashm., is a pest of potatoes, the life-history 

 t)f which has already been noticed [see this Review, Ser. A, iv, p. 133, 

 and vi, p. 455]. 



The measures recommended against it are thorough spraying with 

 an angle-disc or under- spray nozzle, using one of the following solutions : 

 (1) Blackleaf 40 | U.S. pint, hard soap dissolved in boihng water 2 lb. 

 (Hquid soap, 1 U.S. quart) and water 50 U.S. gals. (2) Blackleaf 10, 

 or any similar nicotine preparation, combined with lead arsenate or 

 Bordeaux mixture, but \\dthout the addition of soap. (3) Kerosene 

 emulsion made of hard soap | lb. (liquid soap, ^ U.S. pint), water 

 1 U.S. gal. and kerosene 2 U.S. gals. ; this kills about 90 per cent. 

 of the Aphids, but is liable to damage the fohage. 



€laassen (P. W.). Grasshoppers of Kansas. — Systematic Treatise of 

 the Melanopli with Reference to Variations from Scudder's 

 Descriptions. — U7iiv. Kansas, Lawrence, Biol. Ser. Bull., xviii, 

 no. 1 (Dept. Entom. Bull. no. 11), October 1917, pp. 7-50, 

 2 plates. [Received 18th October 1918.] 



The contents of this systematic paper are indicated by its title. 

 The biology and economic status of the species of Melanoplus are 

 briefly discussed. The most injurious species occurring in Kansas are 

 M. dijjerentialis, M. bivittatus, 31. atlaniis, M. femur-nibrum and 

 Aeolopus regalis. The parasitic fly, Sarcophaga kelli/i, is largely 

 instrumental in reducing the numbers of these grasshoppers. The 

 usual methods of control are advocated. 



Beamer (R.). The CEdipodinae of Kansas. — Univ. Kansas, Lawrence, 

 Biol. Ser. Bull., xviii, no. 1 (Dept. Entom. Bull. no. 11), October 

 1917, pp. 53-126, 103 figs. [Received 18th October 1918.] 



This paper forms the second part of a series dealing with the 

 ■Orthoptera of Kansas, of which the preceding paper is the first. 

 Descriptions are given which it is hoped may enable the casual observer 

 to recognise the various species and the relation they bear to each 

 other. The original descriptions are given wherever possible, with 

 notes on the variation of Kansas forms and habitat records. 



