128 



The most serious disease with which Demodex has been connected is 

 follicular or red mange of dogs, which is caused by Staphylococcus 

 pyogenes albiis, and the symptoms and treatment of which are discussed. 

 Mites of this genus have also been found in connection with skin disease 

 of cats, horses, cattle, pigs and goats. Little is known of the habits 

 of these parasites, but infection is probably due to actual contact of 

 infested animals with others of their species. They may attach them- 

 selves to active ectoparasites as a means of dispersal. All stages have 

 been found to be present together in one follicle. A list of the species 

 and varieties of this genus with their hosts and known distribution 

 is given. 



McAtee (W. L.) & Walton (W. R.). District of Columbia Diptera : 

 Tabanidae. — Proc. Ento'm. Sac Washington, D.C., xx, no. 9, 

 December 1918, pp. 188-206, 2 figs. [Received 21st May 1919.] 



The number of species given in this list of Tabanids occurring in 

 the District of Columbia is 54. The larvae of most of them live in 

 water or wet soil and the adults are found in the greatest abundance 

 in well-watered situations. Keys are given to the genera and species 

 contained in the list and a comparison is made between the species 

 found in the district of Columbia and those of New Jersey. A species 

 closely allied to Chrysops, but differing markedly from it in habitus 

 as well as certain structural characters, is described as NeochrysojJS 

 globosus, gen. et sp. nov. 



Paeker (R. R.) & Wells (R. W.). Observations on and Experiments 

 with Cuterebra tenebrosa, Coquillet.— JZ. Parasitology, JJrbana, 111., 

 v, no. 3, March 1919, pp. 100-104, 1 plate. 



During investigations of large numbers of rodents as possible hosts 

 of Dertnacentor venustus, Banks, a pack rat {Neotoma cinerea) and a 

 grasshopper mouse {Onychonomys leucogaster missouriensis) were 

 found infested with larvae of Cuterebra tenebrosa, Coq. (rodent bot- 

 fly). A female fly in captivity deposited 186 eggs, and the larvae reared 

 from these were used for experimental infestations of prairie dogs, 

 Belgian hares and ground squirrels. In the case of the two latter, 

 negative results were obtained. Full particulars of each experiment 

 are given. The effect of the presence of the larvae on the prairie dog 

 is very slight. 



Frey (J. J.). Problems in Anthrax Control. — Jl. American Vet. Med. 

 Assoc, Baton Rouge, La., Iv, (N.S. viii), no. 2, May 1919, 

 pp. 192-198. 



In this paper suitable vaccines and their application to cattle in- 

 fected with anthrax are discussed. Tabanus atratus is considered to 

 be responsible to a large extent for the transmission of the bacilli. 

 Other flies and mosquitos are probably concerned to a less extent. 

 All carcases should be immediately cremated to prevent the spread 

 of the disease. 



