39 



Peju (G.). Culicides dans les Ardennes (avec Pr6sentation d'une 

 Carte des Foyers d'Anoph^les). — C. R. Soc. Biol, Paris, Ixxxii 

 no. 31, 6th December 1919, pp. 1267-1269. 



In spite of the latitude and cold cHmate of the Ardennes various 

 Anopheline centres have been located which are responsible for the 

 locally acquired malaria among the troops occupying the trenches 

 in this region during the war. 



The numerous clear rivers of the south of this district and the 

 stagnant waters with impermeable subsoil of crystalline rock in the 

 north ofTer ample conditions favourable to the breeding and develop- 

 ment of Anophelines. 



Of the mosquitos in the district the Anophelines, represented by 

 A. macidipennis and A. bifurcates, form about 8 to 9 per cent. The 

 majority are found in the vicinity of stables, cowsheds and inhabited 

 locaHties. From the middle of October they begin to disappear 

 out of doors and by November only a few stragglers are found in 

 dwelhngs, whereas in stables and cowsheds about 20 per cent, of 

 those present during the summer may still be found. Tliis fact 

 seems to indicate the desirability of directing prophylactic 

 measures against the adults in preference to the larvae, especially of 

 A. maculipeHnis. 



Sergent (Et.). Le Plasmodium relictum. Agent pathogene du Paludisme 

 des Oiseaux, ne donne pas una Maladie mortelle au Moustique 

 transmettear.— Bull. Soc. Path. Exot., Paris, xii, no. 9, 12th 

 November 1919, pp. 601-603. 



It has always been considered that malarial plasmodia are highly 

 pathogenic to the insect vector, but if this were so it would be logical 

 to suppose that after a severe epidemic of malaria the number of 

 infected mosquitos would be greatly diminished, and this has not 

 been observed. It is true that Anophelines are generally less abundant 

 in autumn, but this is largely explained by meteorological conditions ; 

 moreover, they are generally more highly infective at this period 

 than in the summer. Many cases of malaria, although contracted 

 in the summer, do not become highly virulent until the autumn. 

 Observations in the laboratory confirm the hypothesis suggested by 

 these reflexions, namely that the plasmodia are not very pathogenic 

 to the insect transmitter of the virus. Among some hundreds of cases 

 of infestation of Culex spp. by Plasmodium relictum, each of which 

 carried at least 100 zygotes at their maximum development, no higher 

 rate of mortality was observed than among slightly infected or entirely 

 uninfected individuals. 



Sergent (Et.). Dans le Paludisme des Oiseaux (dQ au Proteosoma) 

 il n'y a pas de Parallelisme entre rinfection sanguine de I'Oiseau 

 et rinfection consecutive du Moustique contamine par I'Oiseau. — 



-Bull. Soc. Path. Exot., Paris, xii, no. 9, 12th November 1919, 

 pp. 603-605. 



For about a week malarial fever in birds is very acute, and during 

 this time blood parasites are found in all stages, gametes being 



