89 !^ ^mzZ]9W a] 



Dyar (H. G.). The Larva of Aedes idahoensis (Diptera, O^Iicidajp).— j,,: '^ 



Insecutor Insciiiae Menstruus, Washington, D.C, v, iio. lO-^^j^'^ 

 October-December 1917, pp. 187-188. 



From the examination of adults bred from larvae found in a road- 

 side pool in Montana, the author concludes that Aedes spenceri and 

 A. idahoensis represent distinct species, the former being absent from 

 southern Montana. 



BisHOPP (F. C.) & AVooD (H. P.). Preliminary Experiments with 

 Sodium Fluoride and Other Insecticides against Biting and Sucking 

 Lice. — Psyche, Boston, Mass., xxiv, no. 6, December 1917, 

 pp. 187-189. 



The very satisfactory results obtained by the authors from the use 

 of sodium fluoride against various species of Mallophaga (biting lice) 

 on poultry [see this Review, Ser. B, vi, p. 14] have led to further 

 research on the use of this compound against the lice infesting cattle, 

 horses and other domestic animals. 



Previous experiments with the standard arsenical dip usually known 

 as the B.A.I, formula (8 lb. white arsenic, 24 lb. sodium carbonate 

 crystals, 1 U.S. gal. pine tar, to 500 U.S. gals, water) have proved it 

 to be a very effective insecticide against both Mallophaga and 

 Anoplura. One thorough spraying or dipping of cattle quite 

 heavily infested with Trichodectes scalaris, Nitzsch, and Haematopinus 

 eurysternus, Nitzsch (short-nosed cattle louse), completely destroyed 

 them in two treatments at weekly intervals. One dipping with 

 arsenical solution also destroyed all forms of T. scalaris and Linognathus 

 vituli, L. (long-nosed ox louse). In one experiment, arsenical solution 

 of half normal strength killed the adults, larvae and eggs of T. scalaris, 

 but those of L. vituli were not completely destroyed. In short, 

 arsenical solutions have an immediate eSect on biting lice, but not 

 on sucking lice or ticks. 



Experiments with the following substances : — Kerosene emulsion 

 (2 U.S. gals, kerosene, | lb. laundry soap, 1 U.S. gal. water) diluted 

 1 to 8 and 1 to 12 ; flowers of sulphur (| lb. per animal) ; 40 per cent, 

 nicotine sulphate (1 to 800) ; soap and water (1 oz. per U.S. gal.) ; and 

 sodium fluoride (commercial 90-98 per cent.) as a dust and dip, proved 

 that all of them, with the exception of soap and water, killed all stages, 

 and even the last killed all but the eggs. 



Sodium fluoride (97 to 98 per cent.) was used as a spray at the rate of 

 1 oz. and also ^ oz. per U.S. gal., and at both strengths immediately 

 destroyed all stages. For application as a dust it was mixed with flour 

 in the proportion of 1 oz. sodium fluoride to 5 oz. flour, treatment of 

 a yearling requiring 6 oz. of the mixture. All lice were destroyed on 

 two other animals by the application respectively of 3 oz., dredged and 

 worked into the hair, and of 1 oz. apphed with a bellows dust-gun. 



In the case of dogs heavily infested with Trichodectes latus, Nitzsch 

 (biting dog louse), all the Uce were destroyed and consequent lesions 

 quickly healed by the application of 1 oz. of the powder by means of a 

 dust-can or of 1 oz. sodium fluoride dissolved in 1 U.S. gal water used 

 as a dip. 



Owing to the comparatively high price of sodium fluoride, this 

 substance cannot be recommended as a dip for large animals when 



(C464) Wt. P2/137. 1,500. 5.18. B.&F.Ltd. G.11/3. 



