61 



Among the species dealt with the following are new, and except where 

 otherwise stated, they were collected from the Gold Coast : Culicoides 

 corsoni ; C. nigeriae, from Nigeria ; C. inornatipennis, C, I. & M., 

 var. ruHliis, n., reared from material from the bases of banana stumps, 

 and from a rot-hole in a silk-cotton tree ; Dasyhelea nigeriae, from 

 Nigeria ; D. boothi, from Nigeria ; D. retorta, from Sierra Leone ; 

 Atrichopogon africanum; A. elektrophaeum ; A. perfuscmn; A. 

 chrysosphaerotum and A. homoiiim, reared from rotten wood from a 

 canoe ; Kempia ochrosoma, reared from plants of the water-lettuce 

 [Pistia stratiotes) ; Monohelea litoraurea ; Eiikraiohelea africana, gen, 

 et sp. n., and £". versicolor, reared from P. stratiotes ; Schizodactyhis 

 telmatoscopus , gen. et sp. n., found in puddles of dirty water ; Sphaero- 

 mias {Johannsenomyia) litoraurea, from a drain and from plants of 

 P. stratiotes ; Bezziafoyi, from Nigeria ; Probezziapistiae, reared from 

 P. stratiotes (the larvae, although leading an aquatic existence, were 

 frequently reared to the adult stage in plants kept merely moist) ; 

 P. stephensi, from P. stratiotes ; and Dicrobezzia nigritibialis , found in 

 algae growing in one of the reservoirs of the Accra waterworks. 



Macfie (J. W. S.). The Effect of Saline Solutions and Sea Water on 



Stegomyia fasciata. — Ann. Trap. Med. & Parasit., Liverpool, 

 XV, no. 4, 30th December 1921, pp. 377-380. 



From the results of the experiments described it would appear 

 that a 1-0 to 1-4 per cent, solution of common salt or an equivalent 

 strength of sea water would effectually prevent the larvae of Aedes 

 argentens {Stegomyia fasciata) from developing to the adult stage 

 [cf. R.A.E., B, ii, 84 ; iv, 27]. Sea water used for flushing drains, 

 gutters, market places, etc., would kill the larvae and eggs, and even 

 should the adults oviposit in the ensuing puddles, the eggs would 

 succumb immediately. There is no evidence that the larvae could 

 become accustomed to such degrees of salinity. 



MacGregor (M. E.). The Structural Differences in the Ova of 



Anopheles macidipennis, A. bifnrcatus and A. plnmbeus. — • 

 Ann. Trop. Med. & Parasit., Liverpool, xv, no 4, 30th December 

 1291, pp. 417-426, 1 plate. 



The contents of this paper are indicated by its title. 



Stephens (J. W. W.). Malaria on a Venezuelan Oilfield. — Ann. Trop. 

 Med. & Parasit., Liverpool, xv, no. 4, 30th December 1921, 

 pp. 435-444, 2 plates. 



The occurrence of malaria among the native population and the white 

 staff of a Venezuelan oilfield is discussed. A survey of the district 

 during August showed the Anopheline breeding-places to be definitely 

 restricted to a swamp overgrown \vith a variety of grasses, and a clay 

 borrow-pit some three miles away from the camp. On the oilfield 

 itself sixteen individuals of A nopheles ( Cellia) argyritarsis were captured, 

 none of which harboured sporozoites, though, according to Trovar, this 

 mosquito is a transmitting agent in Venezuela. The fish, Gambusia 

 (Poecilia) tridentigera, Haplochilus sp. and Chromides (Acara) 

 dorsigera were abundant in the small streams and in the swamps. 

 Suggestions are given for drainage, and for general measures against 

 malaria, as adapted to the local conditions. 



