106 



PoMEROY (A. W. J). New Species of African Simuliidae and Further 



Studies of the Early Stages. — Bull. Ent. Res., London, xii, pt. 4, 

 February 1922, pp. 457-463, 2 plates. 



The new species are Simulium hirsutum, described from individuals 

 reared from pupae found attached to grass blades in a swift mountain 

 stream in Tanganyika Territory — examples sHghtly differing from this 

 species, taken in Zanzibar from grass blades in a small stream, are 

 described from pupae only as 5. hirsutum var. dubitim and var. adersi ; 

 5. alcocki, described from individuals reared from pupae attached to 

 grass blades in a slow-moving stream in Nigeria, with pupal varieties 

 described as var. violaceum and var. coalitum ; S. divergens, from the 

 same habitat ; S. vorax, described from females taken engorging on 

 a donkey in Tanganyika Territory ; and 5. palmeri, described from 

 examples bred from pupae found in a swift hill-stream at an altitude 

 of 900 feet in Nigeria. 



Pawan (J. L.). On the Eggs and Oviposition of Psorophora {Janthino- 

 soma) posticata, Wied. (Culicidae.) — Bull. Ent. Res., London, 

 xii, pt. 4, February 1922, p. 481, 1 plate. 



The mosquito, Psorophora posticata, Wied. {Janthinosoma musica. 

 Say) generally oviposits in the rain-water that accumulates in the 

 broken cacao pods strewn in heaps about the cool shady parts of the 

 cacao fields of Trinidad. The eggs lie in circular or subquadrate 

 masses, of from 25 to 40 in number, floating on the surface, the exposed 

 portion assuming in less than half an hour a dark steel-blue appearance, 

 the whole mass of eggs simulating a honeycomb. The larva hangs 

 with its head downwards in the floating egg, and in from 8 to 10 hours 

 after oviposition ruptures the lower, submerged portion, and escapes 

 into the water. 



Balfour (A.). Report on Communicable Diseases in Port Louis. — 



Mauritius, Govt. Printer, 1921, 20 pp. 



In the section on malaria in this report it is suggested that large 

 scale experiments might be made to see if Ctdex tigripes will destroy 

 the broods of Anopheles costalis in places where this Culicine does not 

 naturally exist. C. tigripes is largely a forest mosquito, which may not 

 be adaptable to other surroundings, and may, moreover, thrive only 

 under certain climatic conditions. Its larvae are not effective in places 

 where Anophelines and " millions " coexist, for the fish, which cannot 

 get at the Anopheline larvae on account of the presence of algae, 

 destroy those of C. tigripes. 



Balfour (A.). Report on Sanitary Matters in the Districts of Rivifere 

 du Rempart and Flacq. — Mauritius, Govt. Printer, 1921, 11 pp., 

 1 plan. 



In Riviere du Rempart, Anopheles costalis, Loew, disappears in many 

 localities during the winter, and it is possible that the females hibernate. 

 It is difficult to find any place where this mosquito congregates, as 

 it is in no sense of the word a domestic species. It may possibly 

 find shelter near marshes or in woods or undergrowth. Its sudden 

 disappearance and equally sudden appearance in many places where 

 fever is only rife in summer are not, however, easily accounted for 



