82 



the materials in which they breed. Much fuller knowledge is required 

 of the factors that determine the limits of selection of hosts in these 

 midges, and further work in connection with the relation between 

 the larval and adult food will prove of immense value in solving the 

 problem of control. Their bite has a most irritant effect, and it is 

 quite possible that they may be the medium for the transmission of 

 some disease. 



SuRcouF (J.). Note sur les Dipteres piquers (Tabanidae) recueillis 

 au Laos par M. Vitalis de Salvaza. — Bull. Soc. Ent. France, Paris, 

 no. 19, 14th December 1921, pp. 285-287. 



The following new species are recorded from French Indo-China : 

 \ Tahanus euphanes, T. hypomacros, T. salvazai, T. oknos and T. 

 ' idericus. 



Metalnikow (S.). La Mort sterile des Chenilles infeet^es. — C.R. 

 Hebdom. Acad. Sci., Paris, clxxiv, no. 3, 16th January 1922, 

 pp. 202-204. 



From recent observations it is evident that the same micro-organisms 

 may produce different conditions in the larvae of Galleria mellonella. 

 Those infected with a very virulent cholera vibrio, although receiving 

 only a small dose, succumbed in from 10 to 15 hours as a result of 

 marked septicaemia. Those infected with a less virulent strain 

 (Cholera asiat. S.) showed a different reaction. Similar results were 

 also obtained with staphylococcal infections. 



Although the organisms became entirely enveloped by the 

 phagocytes, practically no normal leucocytes were left, but the blood 

 of the dead caterpillars proved to be sterile, i.e., it did not contain 

 any free organisms. 



Kudo (R.). Studies on Microsporidia parasitic in Mosquitoes. 11. On 

 the Effect oJ the Parasites upon the Host Body. — Jl. Parasitology, 

 Urbana, III., viii, no. 2, December 1921, pp. 70-77. 1 fig. 



The previous records of Microsporidia in mosquitos are reviewed, 

 and the geographical distribution of these parasites is given. The 

 North American species dealt with are Thelohania magna infesting 

 Culex restimns iterritans), T. illinoisensis in Anopheles qtiadrimaculatus , 

 and T. opacita, sp. n., in Ctdex apicalis. 



The effect upon the host is apparently fatal, and the larvae generally 

 succumb before pupation ; in captivity they die in much shorter time 

 than uninfected ones. The pupae and adults appear to be free from 

 infection. 



WicKWARE (A. B.). An unusual Form of Scabies in Fowls. — 



Jl. Parasitology, Urbana, III., viii, no. 2, December 1921, 

 pp. 90-91. 2 figs. 



Megninia gallinulae, Buchh., was taken from scrapings from the 

 head and legs of cockerels received from Quebec. The symptoms 

 produced by this mite, involving marked desquamation, are described. 

 Experiments in artificial transmission by the application of scrapings 

 containing the parasite to scarified surfaces of healthy hens proved 

 negative. 



