44 



Hadwen (S.) & Bruce (E. A.). Anaphylaxis in Cattle and Sheep, 

 produced by the Larvae of Hyjjoderma bovis, H. lineatum and 

 Oestrus ovis. — Jl. Atner. Vet. Med. Assoc, Ithaca, N.Y., li, no. 1, 

 April 1917, pp. 15-33. 



Anaphylaxis has been reproduced in cattle, sheep and small animals, 

 with extracts of the larval stages of Hypoderma bovis, H. lineatum 

 and Oestrus ovis, in both the acute and chronic forms as defined by 

 Richet. The reactions can be induced by returning an extract of the 

 animal's own larvae into the jugular vein, showing that larvae living 

 in animals make them receptive. Instances in nature are recorded 

 where injury had ruptured the larvae subcutaneously, liberating their 

 contents in sufficient quantity to produce shock. Animals that had 

 recovered from the reaction w^ere found to be immune for varying 

 periods. Eye and other local reactions were obtained with extracts 

 applied to the mucous membranes. In cattle the reaction was specific 

 for extracts of Hypodertna, and in a horse for Gastrophilus. 



Hall (M. C), Parasites of the Dog in Michigan. — Jl. Amer. Yet. Med. 

 Assoc, Ithaca, N.Y., li, no. 3, June 1917, pp. 383-396. 



The following parasites are recorded on dogs in Michigan. The 

 sucking louse, Haematopinus {Linognathus) piUferus, and the biting 

 louse, Trichodectes latus, the latter being predominant ; the common 

 dog flea, Ctenocephalus canis ; and the demodectic mange mite 

 Demodex folliculorum var. canis. The common American dog tick,, 

 Dermacentor variabilis, and Sarcoptes scabiei var. canis, probably 

 also occur in Michigan. 



Hall (M. C). Notes in Regard to Horse Lice, Trichodectes and Haema- 

 topinus. — Jl. Amer. Vet. Med. Assoc, Ithaca, N.Y., li, no. 4, July 

 1917, pp. 494-504, 3 figs. 



Not very much work has been done on the bionomics of the 

 lice infesting horses, viz : — the sucking louse, Haematopinus asini, 

 and the biting hce, Trichodectes pilosus and T. parumpilosus. During 

 the winter of 1916-17 the author undertook some experiments of which 

 this paper gives the results. Of 24 horses attacked, 22 were infested 

 with H. asini, and only 2 with T. pilosus. In a number of tests 

 Haematopinus Hved 1 or 2 days after removal from the horse, while 

 Trichodectes lived from 5 to 6 days. This difference may be partly 

 due to the fact that both species were kept in vials with some of the 

 horse's hair, which perhaps furnished food to the biting Hce, while 

 the sucking lice, being deprived of blood, speedily starved. The eggs 

 are attached to the hairs close to the skin and are most common on 

 the fianks and around the angle of the jaw. To determine the length 

 of time required for hatching, eggs were taken from horses and kept 

 in Petri dishes at temperature from 70°-88° F., but the humidity 

 factor was not ascertained. The length of time that the eggs had 

 been on the horse was unk nown, so that a longer time may be required 

 than here given. In the case of T. pilosus eggs hatched in 5-6 days 

 and those of H. asini in 10 to 18 or 19 days. In both cases however 

 a large majority of the eggs failed to hatch, which is believed to have- 

 been due to unfavorable incubation conditions. 



