183 



Hall (M. C.) & Wigdor (M.). Notes on the Acanthocephalid and 

 Arthropod Parasites of the Dog in North America. — Jl. Amer. Vet. 

 Med. Assoc, Ithaca, N.Y., liii, no. 4, July 1918, pp. 493-500. 



This paper gives a summary of the Arthropod parasites of the 

 dog in North America. The ticks include Omithodorus megnini and 

 Ixodes scapularis, reported from the southern United States ; /. kingi 

 from the western United States ; /. ricinus and /. pratti from Canada ; 

 /. cookei from Canada and the United States ; Rhipicephalus sanguineus 

 (brown dog tick) from Texas and Mexico ; Margaropus annulatus 

 (cattle tick) reported on dogs in the southern United States, but very 

 rare on this host ; Amblyomma americanum from Texas, A. tnaculatum 

 from Texas and Louisiana, and A. cajennense from Panama ; Derma- 

 centor venustus {andersoni) from the western United States, D. occi- 

 dentalis from the Pacific coast region, and D. variabilis common 

 throughout the Union and recorded in Canada. 



Sarcoptes scahiei canis is much less common in the United States 

 than Demodex folliculorum canis. Haematopimis [Linognathus) pilifenis 

 (sucking louse of the dog) appears to be more common on the west 

 coast of the United States than in the east, and Trichodectes latus 

 (biting louse of the dog) is also fairly common. Sodium fluoride is 

 an effective remedy and no bad results have been noticed from its 

 use, but the possibility of trouble from poisons ingested by licking 

 the hair must be borne in mind. A 15-grain dose, given in a gelatine 

 capsule, was found to kill a 20-lb. dog in 4 days. 



The fleas, Ctenocephalus canis and Pulex initans, are common on 

 dogs in the United States, and Echidnophaga gallinacea is often found 

 on the ears of dogs in the southern and south-western parts. 



Gastrophilus equi {intestinalis), G. nasalis and G. haemorrhoidalis 

 have been reported in experimental infestations. Chrysomyia macel- 

 laria (screw-worm) is a common parasite of domesticated animals 

 in the south-eastern States and has been recorded from the dog in 

 Panama. Cuterebra emasculator (rabbit bot) has been collected from 

 the dog in North America, and Dermatobia hominis has been recorded 

 from Tropical America. Myiasis, due to infestation with various 

 Dipterous larvae, is not uncommon. Simidium molestum is stated 

 to attack the Newfoundland dogs in Labrador, driving them to take 

 to water for protection. S. pecuarum has been reported from the 

 United States. Stomoxys calcitrans has been recorded as attacking 

 dogs in Canada, and Tabanus lineola and T. trijunctus from southern 

 Florida. 



Freeborn (S. B.) & Atsatt (E. F.). The Effects of Petroleum Oils on 

 Mosquito Larvae. — Jl. Econ. Entom., Concord, N.H., xi, no. 3, 

 June 1918, pp. 299-308. 



Various theories of the lethal action of petroleum oils on mosquito 

 larvae have been advanced, including the following : — That the oiling 

 of a water surface so changes its physical conditions that the larvae can 

 no longer keep the surface by surface tension and quickly drown ; 

 that the oil layer acts as a definite mechanical barrier between the 

 larvae and the outside air and thus leads to their suffocation : that 

 a part of the oil or some of its dissolved or suspended material goes 



