458 EXPERIMENT STATION EECORD. [Vol.41 



" Lice may be reared under incubator conditions in large numbers if fed 

 Avitli liuman blood twice daily, but under such conditions the life cycle is slowed 

 down and the daily and total egg production per female is reduced. Fever, 

 rash, and a general lassitude are produced as a result of the louse bites. 



" Lice and their eggs are destroyed by the ordinary laundering processes used 

 in the washing of cotton and khaki goods ; for woolens slight alterations in the 

 methods of washing are necessary. Chlorpicrin may be used for fumigation 

 of garments, accomplishing the desired results in a short period of time with a 

 small quantity of the chemical, without the use of high temperatures. The 

 sachet method of controlling is ineffective or very expensive. Louse powders 

 may be used with success, but being a wasteful method of applying an insecti- 

 cide are not recommended. Impregnation of the underwear is the most prom- 

 ising method of louse control between lousings. Active chemicals of very low 

 volatility are necessary to prove effective for the longest period of time. Halo- 

 genated phenols such as dibrommetacresol, dichlormonobrommetacresol, and 

 their sodium salts, dibromcarvacrol, and dibromxylenol were found to be the 

 most promising under laboratory conditions." 



In an api^endix the authors describe the preparation of certain compounds 

 used in the experiments. A bibliography of 44 titles is included. 



Contribution to the anatom.y, physiolog-y, and biology of the body louse 

 (Pediculus vestimenti), Z. H. Sikoka {Arch. ScJiiffs u. Tropen Byg. 20, {1016), 

 Beilieft 1, pp. 76, pis. 3, figs. 24). — This part deals with the anatomy of the 

 alimentary canal. 



Silk and silkworms in the Far East, ]Mr. and Mrs. Booth-Tuckeb (Agr. 

 Jour. India, 14 {1910), No. 1, pp. 140-155). — This contains information gathered 

 during a recent visit to China, Japan, Korea, Manchuria, and French Indo- 

 China. 



The peach twig borer (Anarsia lineatella), D. E. Merrill {New Mexico Sta. 

 Bui. 116 {1018), pp. 15, figs. 11). — This is a report of studies of the peach twig 

 moth commenced in the summer of 1912 with a view to determining the life 

 history and habits of the pest and testing control measures under local condi- 

 tions. Injury is caused in tv/o ways (1) to the tender shoots in spring w^hen 

 starting to grow and (2) by the summer broods to the fruit by eating into the 

 surface or into the pit, resulting in dropping or decay and rendering such fruit 

 worthless for shipping. It is said that from 5 to 15 per cent of the fruits of 

 later varieties is not an unusual amount of injury, and in years of severe in- 

 festation the damage may reach 50 per cent. The species now occurs in the 

 Mesilla and Pecos Valley regions, New Mexico, having been first met with by the 

 author in Mesilla Valley in 1912, in which year it was quite numerous. Since 

 then it has been moderately injurious on an increasing scale until 1918, when 

 the damage again was very severe, 50 per cent of the crop in many orchards 

 being more or less injured. 



There appear to hit three generations each year in New Mexico, the broods 

 overlapping. The small overwintering larvse emerge and begin work on the 

 leaf buds about the first few days in April, from which time until about May 1 

 they may be found damaging the growing shoots. Apparently only very young 

 larvfe hibernate, which it is thought represent parts of two broods. The eggs, 

 which are usually laid singly on the twigs near the peaches or directly upon the 

 fruit, hatch in about 5 days. In midsummer the larva; mature in from 8 to 13 

 days, pupation taking place about 24 hours after maturity is reached, at which 

 time the average length is from 10 to 12 mm. From S to 12 days are passed 

 in the pupal stage. 



Control work showed that spraying with powdered arsenate of lead, 3 lbs. 

 to 100 gaL, or lime-sulphur (1: 10) weaker than the usual dormant spray just 



