136 



Barret (H. P.). The mosquitoes of Mecklenburg county, North Caro- 

 lina. — Amer. Jl. Trop. Dis. & Prevent Med., New Orleans, iii, 

 no. 11, May 1916, pp. 607-609. 



This paper gives a list of the mosquitos in Mecklenburg county* 

 North Carolina, especially from near Charlotte. It comprises : Culex 

 territans, C restuans, C. fatigans (quinquefasciatus), C. pilosus ?, 

 Psorophora columhiae, P. discolor, P. sayi, Stegomyia fasciata {Aedes 

 calopus), Ochlerotatus (A.) sylvestris, 0. (A.) canadensis, 0. (A.) triseria- 

 tus, Megarhinus septentrionalis, Orthopodomyia {Bancroftia) signifer 

 and Anopheles punctipennis. C. restuans and C. fatigans were the 

 commonest species found, the former throughout the season and the 

 latter from the middle of summer on. They usually breed in rain 

 barrels, stagnant water and almost any temporary collection of rain 

 water. C. territans was never taken near houses nor in stagnant 

 water, but was commonest in slow-running streams. It does not 

 attack man. 0. sylvestris was frequently found at the end of summer 

 and always in temporary rain pools. S. fasciata was often found 

 in cans, rain-barrels, etc., and always near dwellings. 0. canadensis 

 was found only once during the summer. It was one of a number of 

 species breeding in a water- filled pit in the woods. A. triseriatus was 

 taken on one occasion from a tree-hole and from a can, both in the 

 same locality. P. discolor was found once, in a temporary rain-pool. 

 The larvae of P. sayi were not found, but the adults were often caught 

 in the woods. Larvae of 0. signifer were found in large numbers in a 

 tree-hole. A. punctipennis was found in almost every kind of breeding 

 place, except tree-holes. 



MiTZMAiN (M. B.). Tertian malarial fever. Transmission experiments 

 with Anopheles punctipennis. — Public Health Repts., Washington, 

 D.C., xxxi, no. 19, 12th May 1916, pp. 1172-1177. 



This paper describes work confirming King's discovery of the 

 infection of Anopheles punctipennis, Say, by Plasmodium vivax [see 

 this Review, Ser. B, iv, p. 53]. Under the conditions cited, 32-5 per 

 cent, of the forty mosquitos experimented with were positive, as against 

 10-5 per cent, of nineteen A. crucians, Wied., fed at the same time and 

 kept under identical conditions. Two examples of A. quadrimaculatus. 

 Say, used as additional controls, proved to be negative. Only twenty 

 specimens of A. punctipennis survived six days or longer after biting. 

 With a feed on blood of low infectivity, thirteen individuals of 

 A. punctipennis showed infection in from six to twenty-five days. Eight 

 of the positive specimens became infective, as shown by moderate 

 to immense numbers of typical sporozoits invading the salivary glands. 

 In the control series of nineteen A. crucians, two, or 10'5 per cent., 

 were infective with the parasites of P. vivax eleven and thirteen days 

 after biting. The infectibility of A. punctipennis was demonstrated 

 in the transmission of the disease through the biting of four mosquitos, 

 which reproduced the infection in three healthy volunteers living ia 

 New Orleans during February 1916, after incubation periods of 

 fourteen and fifteen days. One of these persons had escaped infection 

 four months previously from the bites of more than 200 A. punctipennis 

 in two experiments with the subtertian type. From this single 

 instance it is indicated that A. punctipennis served as a host for P. vivax y. 

 but not of P, falciparum. 



