186 



larvicidal measures, it is suggested that 18 days should be allowed for 

 complete transformation from the larval stage and 12 days for the 

 adult mosquito to become infective ; a total of 30 days may therefore 

 be deducted from the date determined as that of ultimate mosquito 

 infectibility ; should this be the 1st November, oiling and larvicidal 

 measures may be discontinued on the 1st October. The author is not 

 prepared to make any specific recommendations as to the influence 

 of these observations on personal quinine prophylaxis. 



Fowler (R.). The Risk of Malaria in Australia — Med. Jl. Australia^ 

 Sydney, 6th Yr., ii, no. 5, 2nd August 1919, p. 83, 1 chart. 



Attention is drawn to the danger of an increase of malaria in 

 Australia owing to the return of infected troops, and the necessity for 

 adopting suitable preventive jneasures. 



Smyth (E. G.). Report of the Division of Entomology.— ^wn. Rept. 

 Porto Rico Insidar Exp. Sta., Rio Piedras, 1st July 1917 to 

 30th June 1918, 1919, pp. 109-129. 



The horn-fly, Lyperosia irritans, L. {Haematobia serrata, Desv.) has 

 caused a heavy mortality in dry years in Porto Rico to the cattle that 

 are so much used in the sugar-cane industry. Remedies suggested are 

 the smearing of cheap grease on the shoulders of cattle and the 

 spraying of dairy herds with a repellent. For the destruction of these 

 flies, the manure should be spread out with a brush drag or covered 

 with chloride of lime to prevent the larvae from maturiag. A scheme 

 for introducing the beetle, Canthon violaceus, which is an active agent 

 in the quick disposal of cattle dung, into the Island has been frustrated 

 by the War. 



Hamm (A. H.). Observations on the Horse Bot-fly, Gastrojjhdus 

 eqiti, F. — Entomologist' s Mthly. Mag., London, no. 58, October 1919, 

 pp. 229-230. 



Attention is drawn to the abundance of the bot-fly, Gastrophilus 

 equi, F., in various localities in England during August 1919. This 

 was probably due to the exceptionally fine and hot weather. The 

 mode of oviposition is described. 



The Cattle Tick Pest.— Inst. Science and Industry, Melbourne, Bull. 

 13, 1919, 40 pp., 12 figs. [Received 8th October 1919.] 



The bulk of the information contained in this bulletin has already 

 been noticed [see this Review, Ser. B, vii, p. 12.]. In December 1917, 

 a Board was created to deal with all matters directly pertaining to the 

 control or eradication of ticks [Boo2jhilus australis] in Queensland, As 

 a result, four cleansing areas were established. In north Queensland 

 the policy is to prevent tick infestation from spreading southwards. 

 Many new dipping tanks have been erected, cattle are permitted to 

 enter at two places only and all cattle from the north are dipped before 

 entry. In view of the great areas of unfenced country eradication is 

 at present impossible, and the same conditions may be said to exist in 

 the Northern Territory and the Kimberley divisions of Western 

 Australia, a very large area having been proclaimed under quarantine. 



