130 



Cattle suffer most from its attack and hunting dogs less severely. 

 Man is seldom attacked ; horses are almost immune and mules slightly 

 less so. In the case of the other indigenous species parasitism is 

 limited to rodents. Only a few Brazilian rodents, chiefly Muridae, 

 are affected. The larger kinds, such as the capybara and introduced 

 species of Muridae, seem immune. Among many thousand of 

 Mus decmnanns examined none were parasitised, while among a few 

 specimens of other rats two harboured HolocJiilus vulpinus. Gener- 

 ally speaking females seem to predominate among the species of 

 Cuterehra and Dermatobia. The contrary obtains in the case of 

 Pseudogametes, though not to a very marked degree in P. semiatra. 



As regards the habits of Dermatobia, it is confirmed that this fly 

 sucks liquids with its proboscis. It does not appear to mate during 

 the first few days after emergence. The eggs seem to be laid direct 

 on blood or sweat-sucking insects, such as Anthomyia and not neces- 

 sarily on mosquitos such as Janthinosoma lutzi. Typical larvae of 

 Dermatobia have been hatched from eggs taken from the left side of 

 the abdomen of a small male of Synthesiomyia brasiliana, B. & Berg. 

 These larvae preferred the dry skin of a dog to the human skin. 



The author also records Oestrus ovis from Rio de Janeiro and 

 neighbouring States. It is not confined to the cool mountainous 

 zones, but is also found in the tropical regions. 



Chatton (E.). Observations et Experiences faites i Gabes sur le,Ver 

 de Guin6e. Preuve exp6rimentale de I'lnfestation des Cyclops par 

 Voie intestinale. [Observations and Experiments made at Gabes 

 on the Guinea Worm. Experimental Proof of the Infestation of 

 C^c^o^s through the Digestive Tract. 1 — Arch. Inst. Pasteur, Tunis, 

 X, no. 3, March 1918, pp. 158-169. 



While it does not seem Hkely that carriers of the Guinea worm 

 among the native troops can infect the waters of the south Tunisian 

 oases with the larvae of this parasite, it is recommended, in view of 

 the customs of the inhabitants of these oases, that such carriers 

 should be isolated and subjected to treatment. The mode of infesta- 

 tion of its diiferent invertebrate hosts by the worm is described. In 

 the case of Cyclops the larvae are ingested passively, the badly- wounded 

 ones dying and being digested, others penetrating through the digestive 

 wall into the general cavity. Larvae are similarly ingested by Cypris 

 and by Culex larvae, with even less immediate damage, but they 

 cannot pass into the general cavity of these hosts and pass through 

 the alimentary canal alive. 



Sop ARK AR (M. B.). A Trematode Parasite of Anopheline Mosquitos. — 



Indian Jl. Med. Research, Calcutta, v, no. 3, January 1918, 

 pp. 512-515. [Received 25th April 1918.] 



The resemblance of the recently described Trematode parasite in 

 Anopheline mosquitos [see this Review, Ser. B, vi, p. 2] to similar 

 encysted Trematodes found by the author on the fins of certain fresh- 

 water fish, as well as in the bodies of snails, chiefly Planorbis exustus, 

 led him to attempt to develop these encysted forms in mosquitos 

 by artificial infection. 



