356 EXPERIMENT STATION EECORD. [Vol. 37 



attention to a few instances in which humidity, chiefly in the form of rain or 

 snow, has been and is instrumental in either aiding or curtailing the spread of 

 insects over the country, particularly in the prairie Provinces of Canada. 



Investigations on the resistajice of the larvse of Cossus and Carpocapsa to 

 cold, Mlle. F. Gueylabd and P. Poetiee (Compt. Rend. Soc. Biol. [Paris], 79 

 {1916), No. 15, pp. 77.J-777).— The authors conclude that the larva of Cossus 

 cossus is able to resist a complete freezing of all its organs and tissues and that 

 fi'eezing may be repeated a considerable number of times without its tissues 

 being altered. A rapid rise of temperature, from — 15° to 30° C, (from 5° 

 to 86° F.), did not cause the death of the caterpillar or appear to alter its 

 tissues. This resistance to cold results from an adaptation during the winter 

 months only. 



The reactions of the larva of the codling moth appear to be quite similar. 



The insects attacking stored wheat in the Punjab, and the methods of 

 combating them, including a chapter on the chemistry of respiration, J. H. 

 Baenes and A. .7. Grove (Hon. Dcpt. Agr. India, Chem. Ser., 4 {1916), No. 6, 

 pp. VI+165-284, pis. 5, figs. 12; abs. in Ent. Mo. Mag., S. ser., S {1917), No. 28, 

 pp. 88-90). — The several chapters of this memoir, based upon investigations 

 first commenced in 1911, deal, respectively, with the life history of the prin- 

 cipal insects infesting wheat in the Punjab, chemical experiments, respiration, 

 effect of moisture and dryness on the rice weevil, Attagenus undulatus, and 

 Rhizopertha dominica. 



The insects found in stored wheat consist of eight species of Coleoptera and 

 one of Lepldoptera. Only three of these are actively responsible for damage to 

 the wheat, namely, the dermestid A. undulatus, the bostrychid R. dominica, 

 and the rice weevil. Of the other species, L<tmophloeus sp. is found only on 

 floury frass and grains already damaged by other insects. TrihoUum castaneum 

 was proved by experiment unable to live on sound grains, and is strictly a Hour 

 beetle rather than a wheat beetle, as Is Lathcticus oryzae. Alphitobius piccus 

 appears to l)e merely a scavenger and not to attack the grain, and the granary 

 weevil is rarely found. The Angoumois grain moth was observed in only one 

 district. The life histories of these insects are dealt with and illustrated in 

 colored plates. 



The senior author is largely responsible for the chemical and physical studies 

 and the mechanical and remedial work and the junior author for the ento- 

 mological phases. 



Florida truck and garden insects, J. R. Watson {Florida Sta. Bui. iSJf 

 {1917), pp. 35-127, figs. 57). — This is a summary of information in which par- 

 ticular attention is given to control measures. 



Insects injurious to timber in Sweden, N. A. Kemneb {Meddel. Centralanat. 

 Forsoksv. Jordhruksomradet, No. 108 {1915), pp. If5, figs. S3; abs. in Internal. 

 Inst. Agr. [Rome], mteniat. Rev. Sci. and Pract. Agr., 7 {1916), No. S, pp. 465, 

 466). — The insects that are particularly injurious to timber in Sweden belong to 

 the family Anoblida?. A list is given of their important natural enemies and 

 recommendations as to control measures. 



Beport of first expedition to South America, 1913, R. P. Stbong, E. E. 

 Tyzzeb, C. T. Bkues, a. W. Sellakds, and J. C. Gastiabitbu {Cambridge: 

 Harvard School Trop. Med., 1915, pp. XIV-\-220, pis. 49, figs. 9).— The main part 

 of this work relates to Oroya fever and to verruga peruviana, which the 

 authors consider to be separate diseases. The investigations of Townsend on 

 insect transmission of verruga peruviana, previously noted (E. S. R., 35. p. 

 258), are also discussed. Chapters on entomological investigations at Matu- 

 cana ; uta ; sanitary conditions, prevailing diseases, and entomological investi- 



