17 



The increase of any species of Cahsoma is limited by the possible 

 food supply, by the adaptation of its habits to the feeding and pupation 

 habits of its Lepidopterous host, by cannibalism among the larvae of 

 different species in cases where the food supply is greatly restricted, 

 and by the climbing habits of some species, which thereby assume a 

 greater economic importance. 



The natural enemies of this genus include toads, skunks and various 

 species of insectivorous birds, as well as predaceous and parasitic 

 insects such as a bug, Podisus sp., and a Tachinid fly, Pseudatrac- 

 tocera colosomne, Coq. 



In the tables which are given for determining the adults and larvae 

 of this genus, the species included are C. si/cophanta, L., C. inquisitor, 

 L., C. reticnlatum, F., and C. auropunctatum, Payk., imported from 

 Europe, and C. chinense, Kirby, and C. moximoiviczi, Mor., from 

 Japan. 



The bulletin concludes with detailed descriptions of 38 species, a 

 bibliography of each being appended. 



CoAD (B. R.) & McGehee (T. F.). Collection of Weevils and Infested 

 Squares as a Means of Control of the Cotton Boll Weevil in the 

 Mississippi Delta. — U.S. Dcpt. Agric, Washington, D.C., Bull, 

 no. 564, 4th October 1917, 51 pp., 2 plates. 



The experiments on cotton boll-weevil control made in 1915 and 

 iilroady noticed [see this Rcrieiv, 8er. A, iv, p. 418] were continued the 

 following year, with the special object of ascertaining the value of 

 various methods of collecting boll weevils [Anlhonomus grandis] and 

 infested cotton bolls as a means of control. It was found that 

 picking operations were a complete failure in exerting any appreciable 

 effect on the infestation, the maximum amount of benefit being 

 derived during a year of light infestation, as in average years there 

 is a great excess of weevils for producing the maximum injury to the 

 crop, and a considerable number of these can be removed without 

 appreciably increasing the crop secured. This is especially discouraging 

 in view of the fact that in a year of hea,vy infestation the control 

 measure is most needed. 



The use of the bag-and-hoop as a means of collecting the weevils, 

 proved to have a most injurious effect on the plants, the loss of the 

 terminal buds due to the shaking, and the constant bending resulting 

 in a dwarfed bushy growth. A mechanical collector driven between 

 the rows while the plants were violently agitated was equally 

 unsatisfactory, badly breaking the stems when driven close enough to 

 catch the wee\"ils. As a mechanical picker seems to be the only 

 solution of the labour problem involved in the collection of weevils 

 and squares, this failure to give satisfactory results is very discouraging. 



Back (E. A.) & Grossman (S. S.). Miscible Oil versus Fish Oil Soap 

 Sprays for the Control of Florida Aleurodids.— JL Econ. Entom., 

 Concord, N.H.. x, no. 5, October 1917, pp. 453-458. 



Sprajnng experiments that have been carried on more or less 

 continuously during recent years against Aleurodids on citrus in Florida 

 have proved beyond question the superiority of particular miscible oil 

 sprays and standard brands of fish-oil soap. Certain home-made 



tC433) B 



