14 



have not yet been ascertained. Recovery was apparently complete after 

 five or ten minutes. When 60 or 100 per cent, was thoroughly rubbed 

 into the feathers the birds were killed, but the same strength lightly 

 dusted over them did not cause permanent injury. SprinkHng the 

 fowls when on the roost at night with finely powdered naphthaline 

 may provide a very rapid and convenient means of reducing the 

 numbers of lice, but further experiments on these lines are desirable. 

 Naphthaline balls in the nest not only proved of no use whatever in 

 reducing the numbers of lice on sitting or laying hens or in the nest 

 itself, but apparently have a toxic effect on the eggs and newly hatched 

 chickens as well as l:eing injurious to sitting hens. 



WcoD (H. P.). The depluming Mite of Chickens : its complete 

 Eradication from a Flock by one Treatment. — Jl. Econ. Entom. 

 Concord, N. //.. xii, no. 5, October 1919, pp. 402-404. 



The experiments here described show that lime-sulphur, tobacco 

 Fulphur, dry sulphur, arsenical dip, and sodium fluoride, sulphur 

 fnd soap are all effective dips against the depluming mite, Cnemi- 

 (locopes gallinae, Eaill. A dip consisting of § oz. of chemically pure 

 ;cdium fluoride, 2 oz. of sulphur, ^ oz. of laundry soap and about 

 1 U.S. gal. of water proved a complete control for mites, as well as 

 lice. Subsecjuent experiments have confirmed the efficacy of this 

 folution. 



Erues(C. T.). The Occurrence oi Anojihelespunctipennis in Northern 

 New England. — Psyche, Boston, Mass., xxvi, no. 5, October 1919, 

 p. 143. 



Ihe occurrence of Anojiheles pvnctipemiis is recorded in northern 

 Maine, which is apparently further north than previous records denote. 

 The examples in c^uestion were caught far from any railway and must 

 be considered indigenous. They were found in the region of spruce 

 end fir forests. The northern limit of malaria, and probably of 

 Anopheles also, in Europe is at 63° to 69" N. latitude, the species 

 ccncemed being A. quadrimaculakfs. The northern hmit of malaria 

 in New England is said to be about the 45th parallel, which is the 

 latitude at which the recorded captures were made. Larvae of 

 Theohaldia {Cidiseia) impatiens, Wlk., and of Cidex restuans, Theo., 

 were also found, both being of general occurrence in the region. 



Malarial Control. — 5th Ann. Bept. January 1st 1918 — Decemher Slst 

 1918, Internat. Health Bd., Rockefeller Foundation, Neiv York; 

 January 1919, pp. 124-138, 7 figs. [Received 25th November 

 1919.] ■ , 



The malaria control work of the Southern States is summarised 

 as follows : — In the average town having a thousand or more inhabit- 

 ants and a reasonably high infection rate, malaria control by anti- 

 mosc[uito measures is economically feasible and is, in fact, a sound 

 business investment. In heavily infected regions where the cost of 

 mosquito control would be prohibitive, the amount of malaria may 

 be greatly reduced by resort to screening, to immunising c]uinine, 

 or to destroying the parasites in the blood of the human carriers. 



