156 



The eggs of Stegomyia fascialu are deposited singly on the water 

 surface or on the wet margins of surrounding objects. Incubation is 

 complete in 30-50 hours (according to temperature) provided that the 

 surface of the egg be kept moist, following which, the eggs containing 

 I i^dng larvae may be dried, and remain so for months without losing their 

 vitality. Upon subsequent immersion they may hatch within a few 

 minutes, or remain dormant for months, eventually yielding healthy 

 larvae, a fall in the temperature of the water acting as a stimulus to 

 hatching. The experiments on eggs yielded the decisive results that 

 the presence of bacteria, yeasts, and, less definitely, moulds, does 

 exert a stimulus causing eggs to hatch that would otherwise have 

 remained dormant for a longer period, this stimulus, however, being 

 less powerful, or altogether ineffective if killed cultures or sterile 

 extracts, of bacteria or yeasts are used. In the case of the larvae it 

 was proved that they greedily consume and thrive on bacteria and 

 yeasts in the absence of any other food, but entirely fail to develop 

 under sterile conditions, from which it may be concluded that the 

 presence of bacteria or yeasts is a practical necessity for the maintaining 

 of the species. This knowledge should enable the methods now so 

 largely available for the purification of water from bacteria to be 

 utilised for the destruction of this species of mosquito. 



MiTZMAiN (M. B.). Anopheles punctipennis. A Note on its Ability to 

 serve as a Host for Plasmodium falciparum. — Public Health Repts., 

 Washington, B.C., xxxii, no. 27, 6th July 1917, p. 1081. 



In a series of experiments recently conducted at New Orleans, the 

 susceptibility of Anopheles punctipenrds to infection mth the parasites 

 of subtertian malaria has been established, it having been proved 

 easily infectible with Plasmodimn falciparum, Welch. Of one series 

 of 16 mosquitos, given a single feeding, one became infected ; in a 

 second group of 36, given a variable number of feedings, 13 infections 

 resulted ; in the two groups, 27 per cent, of infections were observed. 

 Of 8 examples of A. quadriinaculatus used as controls, 4 developed 

 infections [see also this Review, Ser. B. v, p. 133]. 



Paerot (L.). Sur un nouveau Phl6botome alg6rien, Phlebotomus 



sergenti, sp. n. [A new Algerian Phlebotomus, P. sergenti, sp. n.] — 



Bull. Soc. Path. Exot., Paris, x, no. 7, 11th July 1917, pp. 564- 



567, 11 figs. 



Three species of Phlebotomus have hitherto been recorded from 



Algeria, namely, P. papatasii. Scop., P. minulus var. africanus, 



Newst., and P. perniciosus, Newst. The new species, P. sergenti, here 



recorded, is described from sev^eral male individuals captured at 



Constantine. 



Delanoe (P.). Contribution a I'Etude du Paludisme au Maroc 

 Occidental, i. L'Epid^mie palustre des Oulad Hassoun. [Contribu- 

 tion to the Study of Malaria in Western Morocco, i. The 

 Malarial Epidemic among the Ulad Hassun.] — Bull. Soc. Path. 

 Exot., Paris, x, no. 7, 11th July 1917, pp. 586-611. 



A malarial epidemic occurred in western Morocco in 1915, 

 commencing in June and reaching its height in July and August. It 



