164 EXPERIMENT STATION RECORD. 



West Indies, appears to have preAentecl the black, or Hibiscus scale (Lecaniurn, 

 nigruin) from becoming a pest in those islands. 



Tukra disease in mulberry, H. M. Lefkoy (Dept. Agr. Bengal, Quart. Jour., 

 3 (1910), A'o, 3, pp. 113, 17-'/, pi. 1). — Tukra disease, which commonly attacks 

 the bush mulberry, grown in Bengal for rearing silkworms, has been found to 

 be due primarily to the puncture of a mealy bug (Dactylopius nipce). As a 

 remedy, it is recommended that the curled-up leaves be picked and destroyed. 

 Insecticides are of no avail as they do not penetrate the curled-up leaves. 



The anatomy of Siphonophora rosarum, the green-fly pest of the rose tree, 

 A. J. Grove (Parasitology, 3 (1910), No. 1, pp. 1-16, pis. 2, figs. 2). — In this 

 second paper (E. S. R., 21, p. 757) the winged viviparous stage is compared with 

 the apterous viviparous stage. 



A preliminary investigation on flock as a possible distributor of vermin, 

 and on the life history of the body-louse (Pediculus vestimenti), C. War- 

 burton (Rpts. Local Govt. Bd. [Gt. Brit.'], Puh. Health and Med. Matters, n. 

 ser., 1909, No. 2, pp. 5). — The author finds the life cycle of P. vestimenti to 

 be as follows: Incubation period, 8 days to 5 weeks; period from larva to 

 adult, 11 days; period of nonfunctional mature condition, 4 days; and adult 

 life of male 3 weeks, of female 4 weeks. 



" On one occasion a louse was found alive after 5 days of starvation, but it 

 was moribund and unable to feed. A few survived 4 days' fasting in a fairly 

 active condition, but this seems to be about the limit period for danger." 



The author concludes that lice and their eggs may pass through the flock- 

 making machine without being crushed. "The lice themselves are incapable 

 of surviving more than 3 or 4 days without food, and it is extremely unlikely 

 that any of them would be alive when the flock was converted into bedding. 

 The eggs, however, may take a month or more to hatch, and it is quite possible 

 that living eggs might be present in bedding." 



The large moth borer of sugar cane, F. A. Stockdale (Jour. Bd. Agr. Brit. 

 Guiana, 3 (1910), No. 3, pp. 150-155). — This account of Castnia licus includes 

 a report of its occurrence and injui'y to sugar cane on the East Coast of British 

 Guiana as investigated in 1909. The injury is caused by the larva, which 

 bores in the cane eating the internal tissue as it works its way upward. 



Artificial production of multivoltine races of silkworms, J. F. Abbott 

 (Science, n. scr., 31 (1910), No. 798, pp. 5S6-5S8). — A review of some recent 

 work on the subject. 



Mosquito habits and mosquito control, F. Knab (Science, n. ser., 31 (1910), 

 No. 805, p. 869). — A brief critical discussion. 



Attention is called to the fact that normally the eggs of the yellow-fever 

 mosquito are deposited out of water, at the edge of the water film and that 

 here the eggs remain until they are submerged, whereupon hatching takes place. 

 " Eggs remaining out of water retain their vitality a long time. In laboratory 

 experiments eggs have been kept dry as long as five months, and, when then 

 submerged, produced larvfe ; under favorable conditions out-of-doors it is to be 

 supposed that they will survive even longer." 



On the larval and pupal stages of West African Culicidae, W. Wesch^ 

 (Bui. Ent. Research, 1 (1910), No. 1, pp. 7-50, pis. 7). — Twenty-nine species are 

 considered in this account. 



Galls on an Indian grass, L. A. Boodle (Roy. Bot. Gard. Kew, Bui. Misc. 

 Inform., 1910, No. 3, pp. 69-73, pi. 1). — Oligotrophus ischwmi, which causes a 

 gall on Indian grass (Ischcemiim pilosiim), is described as new. 



Vaccine and flies, A. Merk ( Hyg. Rundschau, 20 (1910), No. 5, pp. 233-235). — 

 Following a review of previous investigations relating to transmission of the 

 vaccine virus by flies, the details of investigations personally conducted are 



