664 EXPERIMENT STATION RECOED. 



The generations of bark beetles, Borgjiann {ZlscJir. Forst n. Jagdw., 39 

 (1907), i\'o. 8, pp. 5]3-.'jI8). — This is a controversial article regarding the length 

 of the life cycle of bark beetles, particularly Tomiciis typogniphus. Attention is 

 called to the difficulties of determining the average length of a generation of 

 this insect. 



Tomicus polygraphus in Lorraine, Henry {Bui. Sac. Nat. Agr. France, 61 

 (1907), No. 7, pp. 622-635).— The habits and life history of this pest are out- 

 lined. The best method of combating the insect consists in cutting down and 

 destroying infested ti'ees in winter. 



Combating- Ennomos lituraria, Schmidt (Ztschr. Forst u. Jagdw., 39 

 (1907). No. 8, pp. 53'/-536). — It has been suggested that some good might be 

 accomplished in fighting this insect by the removal of fallen leaves and other 

 rubbish about the base of trees. A thorough test of this method over a con- 

 siderable area of coniferous forest showed little or no benefit from the removal 

 of the rubbish. 



The structure, development, and bionomics of the house fly, C. G. Hewitt 

 Quart. Jour. Micros. Sci. [London], n. ser., 51 {1907), No. 203, pp. 395-J,J,8, 

 pis. 5). — A detailed description is given of the internal and external anatomy 

 of the house fly. The literature relating thereto is discussed in connection 

 with a bibliography. 



Report of the mosquito investigations in 1906, J. B. Smith, W. P. Seal, 

 and .1. A. Grossbeck {Ncir Jersey ^tns. Rpt. 1906, pp. 611-670, j)ls. 7, fig. 1). — 

 The work of mosquito eradication was continued during the year under the 

 State law which provides funds for this purpose. An account is given of the 

 status of the work about Jersey City, Newark, Elizabeth, Atlantic Highlands, 

 in the Linden marshes, along Shrewsbury River, and at other points, together 

 with notes on the species observed and their relative prevalence. It has been 

 found that a combination of carbolic acid and gum camphor makes a vola- 

 tile substance of great efficiency in destroying mosquitoes in houses. Mention 

 is also made of other practical remedies and of some proprietary mixtures. 



An experiment in the introduction of fish belonging to the species Gambusia 

 affinis and Heterandria formosa as destroyers of Anopheles larvfe was without 

 practical results, as the fish failed to live in streams where they were intro- 

 duced. It is suggested, however, that this might be accomplished by the 

 State fish commission. 



Information concerning the North American fever tick, with notes on 

 other species, W. D. Hunter and W. A. Hooker {U. 8. Dept. Agr., Bur. Ent. 

 Bui. 72, pp. 87, pis. Jf, figs. 13). — Attention is called to the great economic im- 

 portance of the cattle tick in this country. Details are presented regarding 

 losses caused by cattle ticks, the life history of this pest, its relations to cattle 

 and other animals, the natural enemies of ticks, and the practical methods for 

 the destruction of ticks. The most effective methods for eradicating ticks are 

 those which break the biological relation between* cattle and ticks. Such 

 methods are found in feed lot or soiling systems and the pasture rotation 

 system. 



An elaborate series of observations indicates that the length of the period 

 from the dropping of ticks to oviposition ranges from 3 to 41 days. It is also 

 found that the minimum incubation period varies at different seasons of the 

 year from 21 to 56 days and the minimum period from the dropping of the 

 ticks to the hatching of the eggs from 24 to 75 days. During these experiments 

 it was determined that the maximum period from the dropping of the adult 

 ticks to the death of the seed ticks i-anges from 01 to 29.S days. These data 

 may be used in a practical way in devising systems of feed lot and pasture 

 rotations. 



