286 SPOEOZOA. 



into man. Further development could not be achieved in 

 Anopheles maculipennis Meig. or in Aedes [Stegomyia) segypti 

 (Linn.) [= Stegomyia fasciata]. Castellani and Chalmers (1913) 

 stated that illness and death may occur among the monkeys 

 in Ceylon, due to a malarial parasite which they refer to 

 P. kochi. No description of the parasite is given, and according 

 to Sinton and Mulhgan (1932) this report needs confirmation. 

 Habitat. — Blood of monkeys : Ceylon ; Cercopithecus sp. ? : 

 Nilgiris. 



238. Plasmodium pitheci Halberstadter & Prowazek. (Fig. 

 136.) 



■^Plasmodium sp., Laveran, 1905 (as noted in Wenyon, 1926, p. 1363). 

 Plasmodium pitheci, Halberstader & Prowazek, 1907, pp. 37-43, 



pi. vi; Shibayama, 1910, pp. 189-91, 1 pi. 

 f Plasmodium pitheci, Donovan, 1920, p. 719. 

 Plasmodium 2^it^ieci, Reichenow, 1920 c, pp. 207-16, 1 pi. ; 

 Miihlens, 1921, pp. 1611-12. 

 "^Plasmodium pitheci, Donovan (first recorded in Wenyon, 1926, 



p. 1363). 

 Plasmodium pitheci, Wenyon, 1926, p. 972, pi. xv, figs. 29-35 ; 

 Knowles, 1928, fig. 102, 13, 14 ; Reichenow, 1929, <^p. 1006-7, 

 fig. 992 ; Coatney & Roudabush, 1936, p. 340. 



Young rings resemble those of Laverania malarias. FuUy 

 developed trophozoite shows dark brown or black pigment. 

 Schiiffner's dots present. Schizogony resembles that of 

 P. vivaz. Gametocytes resemble those of P. malaria. 



Fig. 136. — Plasmodium pitheci Halb. & Prow. A, ring-form, double 

 infection ; B, older ring ; C, schizont ; D, macrogamete ; 

 E, microgametocyte. (From Reichenow, after Halber- 

 stadter and Prowazek.) 



Remarks. — The parasite resembles P. inui, but is distinguished 

 by its dark brown or black pigment. Shibayama (1910) states 

 that Schiiffner's dots are not present, but Wenyon thinks 

 that his staining was not sufficiently intense to show them. 

 Dodd (1913) recorded an infection of an orang-utang with this 

 parasite, which proved fatal. Reichenow considers it possible 

 that what has been described as P. pitheci may have been 

 one of the human parasites. 



Habitat. — Blood of orang-utang, Simia satyrus Desmarest : 

 Asia (? exact locality — not given by Laveran) ; an Indian 

 menagerie {Donovan). 



