762 EXPERIMENT STATION RECORD. [Vol. 37 



J. S. Regan, of the Massachusetts Afrricultural CJollege. who has condocted 

 erperiiuents, recouuuends the use of blackleaf 40, 1.25 teaspoonful-;. and 1 oz. of 

 soap to a gallon of water, applied with an angle disk nozzle carried close to the 

 ground so that it will direct the spray upwards and hit the vinderside of the 

 leaves. Whale or fish-oil soap used at the rate of 1 lb. to 6 gal. of water is 

 said to be nearly if not quite as good. Either of these insecticides prof)erly 

 applied was found to be from 98 to 99 per cent effective. 



The louse and its relation to disease. — Its life history and habits and how 

 to deal with it, B. F. Cummings {Brit. Museum {Nat. Hist.), Econ. Ser., No. 2 

 (1915), pp. 16. pi. 1, figs. 2). — This is a popular account. 



The rate of increase of the pink bollworm in g^reen bolls in the period 

 July to November, 1916. L. H. Goi-sH {Min. Agr. Egypt, Tech. and Sci. Serv. 

 Bui. IS {1917), pp. 20. pi. 1).— The data here given are based upon 106,400 bolls 

 examined. 



While the highest percentage of balls attacked was found the second week of 

 October, the largest number of bolls attacked must have existed during the 

 third week in September. " If the figures on which our calculations have been 

 based are accepted as sufficiently accurate, it can be estimated that when at its 

 maximum the Gelechia population reached at least 4.500 individuals per thou- 

 sand cotton plants (500 holes). Supposing 2G.000 plants to the fitldan [1.04 

 acres], this gives the alarming total of about 120,000 worms to the feildan. . . 



" Considering that Gelechia is an imported pest, which has boon in Egypt 

 less than ton years, its increase has been enormous. It now occurs, everywhere 

 where cotton is grown in Egj-pt ; in the la.st week of October, 87 per cent of the 

 green bolls In Ix»wer, 78 per cent in Middle, and 60 per cent in Upper Eg>-pt 

 were attacked by It ; and we have received specimens of the adult from the 

 desert at Roman!." 



On the rate of increase of Gelechia gossypiella larvae in green bolls during 

 1916. L. [H.] GouoH {Dul. Soc. Ent. Bgypte, 9 {1916). No. 4. pp. llS-115).— 

 Substantially noted above. 



The pink bollworm, .T. P. Bichanan {Cong. Rec, 55 {1917), No. 126. pp. 

 TlltO-TlIfS). — An address in which attention Is called to the danger of this Im- 

 portant cotton pest becoming established in the Unitt^l States. 



What effect has flooding' of a cotton field by infiltration from high Nile 

 on the numbers of the pink bollworm in that field P {liul. Soc. Ent. Egypte, 

 9 {1916). No. 1,, pp. 105-108). — It is pf>intod out tliat since {Gelcchin) Pcctino- 

 phora gossupiella pupates to a very large extent on the ground amongst fallen 

 leaves, etc., it is very probable that a heavy flooding la-stlng for weeks will 

 cause the death of the pupa? and pupating larvae. Since Earin.i insuJ<jna larvae 

 pupate to a much greater extent on the plants they are much less likely to be 

 destroyed by flooding. 



Sciara tritici, a fly injurious to seedlings, F. W. Edwards and C. B. Wil- 

 iJAMS {Ann. Appl. Biol., 2 (1916), No. 4. pp. 258-262) .—Th\n dlpteran is re- 

 ported to be the source of injury to Primula seedlings. 



The mosquitoes of North and Central America and the West Indies, L. O. 

 Howard, H. G. Dvar, and F. Knab (Camegi/' Inst. Washington Pub. 159, vol. 4 

 {1917). pp. 525-106.^). — This second part of the systematic description, the first 

 part of which comprises volume 3 previously notetl (E. S. R., 34. p. 4.53), com- 

 pletes the work. In these two volumes the authors recognize 3-80 species 

 (besides two which are synonyms, as pointed out In the appendix) Included In 

 25 genera occurring within the North American Continent from the southern 

 edge of Canada to the Isthmus of Panama, Including the Antllle* and Trinidad. 

 Adding to these the species previously mentioned as not included and the ones 



