252 SANITARY ENTOMOLOGY 



Leptomonas cvlicis (Novy, MacNeal, and Torrv, 1907) is native to 

 Culex pipiens and Culex qninquefasciotus (fatigans). Fantham and Por- 

 ter (1915, 1916) fatally infected birds by feeding them on infected in- 

 sects, proving it experimentally pathogenic to Passer domesticus and 

 Chelidon urbica. 



Mastigophora: Binucleata: Plasmodidae 



The Plasmodiums are the causative organisms of malaria, wliich are all 

 carried by the bite of mosquitoes. The cycle of schizogony occurs in man. 



Host I (Man) Host K (Mos«uiTo) 



I 



Cycle of Schizogony Cycle of SpoR0QO^Jv■ 



In Homo Sapiens (Man/. InAmopheles OPR 



LIFE CYCLE OF PLASMODIUM 



The Cause of Pernicious Malaria. 

 Fig. 47. (Pierce.) 



and of sporogeny in the mosquito (fig. 47). This life cycle is very clearly 

 set forth in many textbooks and should be studied carefully by all stu- 

 dents. Briefly it takes place as follows, starting with the minute sporo- 

 zoite inoculated in man by the mosquito. This sporozoite is an elongate 

 sickle-shaped body which bores into a red blood cell, and there fomtis an 

 amoeboid shaped body known as tlie trophozoite, which gives off pseudo- 

 podia that absorb nourishment from tlie cell. At first this trophozoite 

 is of uniform mass, but soon a vacuole is formed, and it may assume a 

 ring form. The trophozoite grows, withdraws its pseudopodia and be- 

 comes a schizont. This divides into many merozoites, which burst the 

 cell and escape into the blood stream. Tiiis completes the cycle of 

 schizogony Avhich may begin again by the mcrozoite entering a red blood 

 cell and becoming a trophozoite. On the other hand it may develop into 



