that the yellow fever mosquito, Aedes argenteus, Poiret {Stegomyia 

 fasciata), may be reduced to such small numbers that the disease 

 would not spread if introduced into a community. 



Cox (F.), Jahraus (P.) & Moore (W.). A List of California Arach- 

 nida. VI. — Jl. Ent. & Zool., Claremont, Calif., xiii, no. 3, 

 September 1921, pp. 23-37, numerous figs. 



This list of Californian Arachnida deals with the mites and ticks. 



Chambers (F.). Piroplasmosis of the Reindeer. — Vet. JL, London, 

 Ixxvii, no. 11, November 1921, pp. 415-419. 



During the winter of 1918-19, cases of piroplasmosis were reported 

 among reindeer in North Russia, the occurrence of the disease so far 

 north being somewhat surprising. Kertzelli, in 1909, was the first to 

 discover an organism that produced a fatal disease among reindeer. 

 This he called Piroplasma tarandi rangiferis, and a translation of 

 his work on the subject is given. The author was not able to observe 

 actual cases, but examined many blood smears. In two, from different 

 animals, a pure infection of an organism resembling Anaplasma 

 marginale was observed. Some slides showed infection with a parasite 

 closely resembling Piroplasma mutans, but the infections were never 

 pure, a number of Anaplasma always being present. No organism 

 resembling Piroplasma {Babesia) bigeminum was seen, though Kertzelli 

 claims to have done so. No mention is made of the transmitting 

 agent, nor of any experimental transmission. No ticks have been 

 observed on reindeer in the district, but examinations were only made 

 when the country was snow- and ice-bound. On the Kola Peninsula in 

 June the author observed an enormous number and variety of biting 

 flies (particularly Tabanids), though he saw no animal upon which 

 they could subsist. All the flies caught were quite empty and 

 apparently exceedingly hungry. It may be that Tabanids transmit 

 the disease mechanically, but the author is inclined to believe that 

 a tick is the transmitting agent. 



Smith (A. H.). A Remedy for Mange in White Rats. — Science, 

 Lancaster, Pa., liv, N.S., no. 1399, 21st October 1921, p. 378. 



Mange affecting white rats in laboratories, which is due to a species 

 of Notoedres (itch or scab mite), may be successfully treated with a 

 2 per cent, solution of chloramine-T. The affected parts should be 

 rubbed daily with cotton soaked in the solution, a cure generally being 

 effected in less than a week. 



Swamp Fever in Horses. — North Dakota A gric. Expt. Sta., Agric. Coll., 

 Bull. 146, March 1921, p. 45. [Received 3rd November 1921.] 



During 1919-20, in the course of swamp fever investigations, 

 attempts were made to determine whether inoculations of extract of 

 Gastrophilus larvae into normal horses would give rise to secondary fever 

 and symptoms of anaemia. A description is here given of the various 

 ways in which this extract was tested on about 18 horses, the results 

 being negative in every case. 



