752 EXPERIMENT STATION RECORD. (Vol. 40 



information is given on the status of game, particularly big game, and recom- 

 mendations as to a revision of the game laws are presented. Lists of hunting 

 licenses and general game shipping licenses issued for the year ended June 30, 

 1918, are appended. 



A convenient method of handling large numbers of individuals in life 

 history studies of insects, R. A. Cushman (Troc. Ent. Son. Wash., 20 (1918), 

 Xo. 5, pp. 112-11.'/, fig. 1). 



The development of a portable insectary. A. W. Tor no. (.four. Econ. Ent., 

 11 (1018). Xo. 6, pp. 476-479, pi. t). — This article gives a description, specifica- 

 tions, and plan of a field insectary made use of in gipsy moth investigations by 

 the Bureau of Entomology of the U. S. Department of Agriculture. 



Observations on the mode of action of contact insecticides. W. Moore 

 (Jour. Econ. Ent., 11 (1918), No. 6, /</>. //•!//'>>• — The author's experiments 

 here reported show thai a contacl insecticide containing oil or soap may pene- 

 trate the trachea? of the Insect, " thus preventing normal oxidations from taking 

 place in the insect's body with the result thai the Insect dies from their mechan- 

 ical action alone. In order to Insure death in this manner it is necessary that 

 all the tracheae be filled with the spray. The vapor of the Insecticide such as 

 nicotin may produce death by chemical action without materially influencing 

 the intake of oxygen. . . . Field experiments with sprays containing free 

 nicotin have shown that the efficacy of such sprays is sometimes Increased 50 

 per cent by the addition ..f soap. . . . The clothes louse was able to close Its 

 tracheae quickly enough to keep out soap solutions, lubricating oils, xylene, and 

 in seven eases out of twelve even ether was prevented from entering." 



A study of the effect of storage, heat, and moisture on pyrethrum. W. S. 

 AnROTT (17. S. Dept. Igr. />'"'. 771 (1919), pp. 6).— The anther reports upon 

 dusting and dipping tests made of Pyrethrum cineraricefoHum at the testiug 

 laboratory of the Insecticide and Fungicide Board of this Department at 

 Vienna, Va., the results of which are summarized a< follows: 



" Whole and ground flower heads kept in sealed fruit jars for 150 weeks were 

 not Injured. Ground flower heads kept in tightly closed glass containers for ."J 

 years lost practically all of their effectiveness. Whole flower heads kept In 

 tightly closed glass containers for •"* years were practically unhurt. Whole 

 flower heads exposed in an open dish In a room for 150 weeks were not in- 

 jured. Ground flower heads were not injured by an exposure for "4 weeks 

 in an open dish in a room. Their value was materially reduced by an ex- 

 posure of 136 weeks and they were practically worthless at the end of 150 

 weeks. Whole and ground flower heads were uninjured by an exposure to 

 the weather of 12 weeks, but an exposure of 21 weeks greatly reduced their 

 efficiency. Powdered Mower heads heated at 120° C. for 18 hours were prac- 

 tically uninjured, but a temperature of 130 to 1 1"" for the same length of time 

 destroyed practically all of their effectiveness. Ground tlower heads were 

 slightly injured by soaking for 24 hours in cold water, and materially Injured 

 by soaking for the same length of time In hot water.*' 



Report of entomologist. W. E. Hinds (Alabama Cnl. Sta. Rpt. IMS, pp. 27- 

 29). — A brief statement of the status of the work on the Adams fund projects 

 on the rice weevil, the use of arsenate of lead agalpsl the boll weevil, and 

 fumigation. 



[Report onl entomology. .1. TBOOF {Indiana Sta. Ri>t. IMS, pp. SO, 31).— This 

 Is a brief statement of the work of the year. Including miscellaneous notes on 



insect depredations In which mention is made of th ■currence of a plant louse 



(Geoica squamosa) which, though rarely troublesome in the state, during the 

 year destroyed whole fields of barley as well as doing considerable damage to 



