486 



or lemons did not seem to increase the attractiveness of the baits for 

 the young larvae of D. maroccanus. 



It is known that locusts do not oviposit in cultivated ground, and 

 the suggestion was made that the ground should be tilled in areas 

 known to be prone to infestation. The Province of Foggia does not, 

 however, lend itself to this method, as the uncultivated tracts are 

 larger in extent than the cultivated ones. 



Feickhinger (H. W.). Die Mehlmotte. Schilderung ihrer Lebens- 

 weise und ihrer Bekampfung mit besonderer Berticksichtigung 

 der Cyanwasserstoffdurchgasung. [The Meal Moth. An Account 

 of its Life-History and Control with special Reference to Fumi- 

 gation with Hydrocyanic Acid Gas.] — Munich, Verlag Natur und 

 Kultur. Dr. Frz. Jos. VoUer, 1918, 63 pp., 16 figs. Price 2 Marks. 



The life-history of Efhestia kiihniella, Z., and the injury done by 

 its larva are described. Infestation is spread from mill to mill by 

 means of the sacks. The various methods employed against this 

 pest are reviewed. The main portion of the paper deals with the theory 

 and practice of fumigation with hydrocyanic acid gas, and gives a 

 detailed account of the methods successfully adopted in Germany 

 [R.A.E., A, viii, 428]. The illustrations are a feature of this useful 

 monograph. 



ScHULZ (U. K. T.). Ergebmisse meiner Zuchtversuche an Anthonomus 

 jpomorum. [The Results of my Breeding Experiments with 

 A. pomorum.] — Entom. Blatter, Berlin, xvi, no. 1-3, 24th April 

 1920, pp. 16-20. [Received 14th September 1920.] 



The author's observations under natural conditions of the apple 

 blossom weevil, Anthonomus pomorum,, have recently been noticed 

 {R.A.E., A, viii, 469]. These breeding experiments were begun in 

 1919. 



It was found that the feeding in spring prior to mating [loc. cit.'] is 

 necessary for full sexual development. Females from which food was 

 withheld at the termination of hibernation were unable to oviposit : 

 in some of the males maturity was sufficiently advanced at the end 

 of hibernation to make mating possible. These captive specimens 

 appeared to suffer from hunger ; their reserve of fat had been consumed 

 during hibernation and they fed on bark. 



An attempt to determine the maximum number of eggs a female 

 can lay showed figures varying from 20 to 46. 



As regards the effect of temperature on the eggs it was found that 

 whereas in the open air the egg-stage usually lasts 8-10 days, this 

 ^period was reduced to 6-6| days indoors at 17°-19° C [63°-66° F.], 

 Eggs in the shade out of doors and exposed to the temperatures of 

 April 1919, which sometimes sank to 2° C. [35° F.], required 14-15 days. 

 Tests with temperatures higher than those normally obtaining indoors 

 could not be made, as gas rationing interfered with the regular working 

 of the thermostats. 



Great difiiculties attended the breeding of the young larvae. The 

 least unsatisfactory results were obtained with pear buds placed in 

 glass dishes with absorbent paper that was daily wetted. The supply 



