652 EXPERIMENT STATION RECORD. [Vol 40 



long-nosed cattle louse (H. vituli) are sucking lice, and the third, the little red 

 cattle louse (Trichodectes scolaris), feeds upon the skin and hair. 



It is pointed out that the largest number of lice occurs during the winter 

 months, and treatment should begin soon after the cows are brought In from the 

 pasture in the fall and repeated in 12 or 13 days and then every month there- 

 after. The application of raw linseed oil with a brush at the time of grooming 

 was found to be very effective and not to burn or injure the skin. In addition, 

 the treatment is quite inexpensive, costing but a few cents per animal for each 

 application. Other control measures which have proved less satisfactory, in- 

 cluding a test of fumigation with a tobacco preparation, are also discussed. 



The hog louse (Haematopinus suis). H. R. Watts (Tennessee Sta. Bui. 120 

 (1918), pp. 3-16, figs. 7). — This Is a preliminary report and a popular account 

 of the results of investigations of the life history and habits of H. suis at the 

 station. 



The eggs of this louse are laid only on hogs, glued to the base of the hairs 

 and chiefly on the lower half of the body. Maturity is reached and the female 

 begins to oviposit in from 11 to 13 days after hatching, from 3 to 4 eggs being 

 deposited per day. The eggs hatch in from 13 to 20 days, the majority on the 

 fifteenth, sixteenth, and seventeenth days. The longevity of the louse averages 

 about 30 days, but a few have been found to live more than 40 days. The life 

 cycle is normally 29 to 40 days, varying from 24 to 63. There are from 6 to 15 

 generations a year, the usual number being from to 12, 



In the treatment of hogs for lice, the application of a thin oil is considered 

 to be the best remedy, though any oil or any mixture containing considerable 

 oil will kill both lice and eggs. "Thick heavy greases or pasty materials 

 should not be used, as they do not spread over the skin well enough to be very 

 effective, and are not economical. Medicated oils, disinfectants, and various 

 proprietary materials are no better than the common oils for killing hog lice, 

 but may be just as good if they contain considerable ail and no substances that 

 are injurious to the animals." 



The pebrine disease of silkworms in India, C. M. HUTCHINSON (Apr. Re- 

 search Inst. Pusa But. 75 (1917), pp. 5. pi*. 2). — This is an Interim report on 

 the author's Investigations of the Pasteur method in the elimination of pe- 

 brine, in which he describes and recommends the trial of a modification of this 

 method, that be has devised and found successful on a small scale at Pusa. 



Pebrine. C. M. Hutchinson {Ann. Rpt. Bd. Sri. Advice Itvlia. P.116-17. pp. 

 61-65). — A brief discussion of work with this disease of silkworms in India. 



Injury caused by the pine twig borer (Evetria buoliana) at Verrieres, 

 P. Leveque he Vilmorin i Bui. Soc. Path. Yea. France. 1, [1917), No. 2. pp. 83- 

 85; al><. in Internat. [tut. Aar. [h'nmc]. Intemat. Rev. Sd, and Pratt. Apr., 

 9 (1918), No. 8, pp. 101',, 1015). — A brief account of this pest at Verrieres, 

 where for many years it has been a source of injury to pine. Several ich- 

 neumon parasites, first observed in 1!»17, may prove of value in its control. 



The oriental peach moth: A Japanese fruit insect recently introduced into 

 the United States, W. B. Wood [Mo. Bui Cat. Com. llnrt.. 7 {1918), So. 9, pp. 

 523-529, figs. 9). — This is a brief account of Laapevresia moleata, a detailed 

 account of which has been previously noted < B, S. R.. ."'.». p. 259). 



A revision of the North American Gracilariidse from the standpoint of 

 venation, C. R. Ely (Proc. Ent. Soc. Wash., 19 (1917). No. 1-4, pp. 29-77, figs. 

 20). — This is a revision of a family of much economic Importance. 



A new Coleophora injurious to apple in California, C. Heinrich (Proc. 

 Ent. Soc. Wash., 19 (1917), No. 1-4, pp. 135. 136). — A new species injurious to 

 apple in California, previously noted (E. S. R., 38, p. 862), is described as 

 Coleophora volckci. 



