75 



Anaplasma marginale as well as Theileria and Nutfallia. The author 

 records his own experiences in the investigation of the evolution of the 

 parasite in the tick. While studying the transmission of Anaplasma 

 he has come to the conclusion that Stomoxys and Tabanids do not 

 transmit this disease. Healthy animals placed with those infected, 

 but freed from ticks, remained uninfected although they were attacked 

 by these flies. 



Campaiia contra la Garrapata. Medidas Oficiales. [Campaign against 

 the Tick. Official Measures.] — Anales Soc. Rural Argentina, 

 Buenos Aires, li, no. 2, March- April 1917, pp. 124-125. [Received 

 31st January 1918.] 



The Argentine Government, acting upon the advice of the Ministry 

 of Agriculture and upon information furnished by various agricultural 

 societies, issued a decree in April 1917 for the purposes of (1) calling 

 attention to the losses caused by ticks, (2) pointing out the necessity 

 for vigorous sanitary action, and (3) authorising the ajDplication of the 

 measures suggested by a Commission appointed by the Ministry of 

 Agriculture in October 1916, if considered suitable by the Live Stock 

 Department. 



The decree defines the limits of certain areas as tick-free, intermediate 

 or infested. Very strict rules are laid down regarding the movement 

 of cattle from one area to another ; these will be enforced two years 

 after the date of the decree. Cattle may be moved from unclassi- 

 fied establishments only after preliminary dipping and then only 

 within their own defined area. Official dipping-tanks will be installed 

 in the larger cattle markets and wherever considered necessary 

 throughout the intermediate and infected areas. Corrals are to be set 

 apart for the temporary housing of tick-free cattle journeying from the 

 north. The best insecticides for tick eradication will be obtained and 

 exact instructions issued for their application in varying proportions 

 throughout the different seasons, as well as practical instructions for 

 dipping. The biology of the tick [Margaropus annulatus] and methods 

 for its destruction are to be studied under direction of the Ministry of 

 Agriculture, and only competent inspectors will be chosen to super- 

 intend the dipping-tanks. All expenses in connection with tick 

 treatment will be reduced to a minimum. 



PopoFF-TcHERKASKY (D.). Beltrag zur Kenntnis der Differential- 

 character zwischen Pediculus capitis, de Geer, und Pediculus cor- 

 poris, de Geer. [A Contribution to the Knowledge of the Diffe- 

 rential Characters between P. capitis and P. humanus (corporis)]. 

 — Centralbl. Bakt., Parasit. u. Infektionskr., Jena, Ite Abt., Orig., 

 ixxix, no. 1, 19th December 1916, pp. 29-33, 4 figs. 



In this paper, dated July 1914, the differential characters of 

 Pediculus capitis and P. humanus are reviewed, the conclusion being 

 reached that these are two extraordinarily closely allied species. It 

 may indeed be supposed that man was originally parasitised by a 

 single species of louse that later became differentiated by adaptation 

 to different habitats. The only constant differential character is the 

 greater length of the antennae and of the femora of the first pair of 

 legs in P. humanus. 



