854 EXPERIMENT STATION EECOED. [Vol.35 



[Studies of the body louse (Pediculus vestimenti)] {Ztschr. Eyg. u. Infek- 

 tionskrank., 80 {1915), No. 2, pp. 289-322, pi. 1, figs. 3).— Two papers (1) A 

 Contribution to the Knowledge of the Biology of the Body Louse and Its Control 

 (pp. 289-298) and (2) The Combat of the Body Louse (pp. 299-322) are pre- 

 sented by E. Widman and B. Heymann, respectively. 



Control of the velvet bean caterpillar, J. R. Watson {Florida 8ta. Bui. ISO 

 {1916), pp. 49-58, figs. 9). — The data here presented are substantially noted 

 from another source on page 852. 



It is recommended that when early varieties of velvet beans, such as the Chi- 

 nese, can be grown a strip around the edges of the field be sown with the 

 Florida variety as a trap crop. This crop should be sprayed or dusted with 

 lead arsenate every two weeks during the caterpillar season, and when it is 

 necessary the main crop should be similarly treated. 



Life history studies of Cirphis unipuncta, the true army worm, J. J. 

 Davis and A. P. Sattekthwait (17. S. Dept. Agr., Jour. Agr. Research, 6 {1916), 

 No. 21, pp. 199-812, pi. 1, figs. 2). — A report of studies of the biology of this 

 commonly injurious and well-known pest conducted at La Fayette, Ind. 



Moths of this species, which were first observed on the night of May 13 feed- 

 ing on the honeydew from insects on white oak, are thought to have been the 

 adults of hibernating larvae. Observations indicate that at La Fayette three 

 complete generations may occur annually and that in some seasons a partial 

 fourth generation may occur. Technical descriptions are given of its immature 

 stages, including six larval instars. The period passed in the last larval instar 

 was approximately two and one-half times as long as any of the previous instars 

 and the amount of foliage eaten was nearly seven times as much as in the fifth 

 and more than 80 per cent of all the foliage eaten during the entire larval 

 period. It is estimated that with 8,890 corn plants to an acre it would require 

 21,473 worms to destroy an acre of corn 2 ft. high, or the progeny of but some 

 40 females. 



For 100 individuals recorded the egg stage approximated 6 days, the larval 26, 

 and the pupal stage 21 days. In one ihstance a larva was observed to molt six 

 times. The largest number of eggs laid by a single female was 254, though ex- 

 aminations showed that the bodies of some females contained more than 800. 



Obaervations on the life history of the army cutworm, Chorizagrotis 

 auxiliaris, R. A. Cooley (17, S. Dept. Agr., Jour. Agr. Research, 6 {1916), No. 

 23, pp. 871-881). 



At the Montana Experiment Station oviposition was observed from September 

 30 to October 12, but may have commenced some weeks prior to that time. The 

 eggs, which were deposited upon the bare soil, hatched in about nine days in- 

 doors but hatching may be delayed by lack of sufficient moisture. The larvae 

 feed for a variable period in the fall and the winter is passed in a partly grown 

 stage. In the spring they feed until about the first week in April, then enter 

 the ground to pupate. The adults emerge from the latter part of June to the 

 middle of July and live over until fall, the ova developing from food obtained 

 as adults. Thus in Montana the species is single-brooded. 



The life history of Gelechia gossypiella from the time of the cotton harvest 

 to the time of cotton sowing, L. Gough {Min. Agr. Egypt, Tech. and Sci. 

 Serv. Bui. If {1916), pp. 16). — An account of the pink boll worm based upon 

 studies in Egypt. See also previous notes (E. S. R., 30, p. 755; 32, pp. 152, 449; 

 33, p. 655). 



The nature of the damage done by the pink boll worm (Gelechia gossy- 

 piella), L. Gough {Min. Agr. Egypt, Tech. and Sci. Serv. Bui. 2 {1916), pp. 6).— 

 This paper relates to the damage caused by the pest above noted. 



