HAEMOSPORIDIA 



439 



liden lunifrons lunifrons; gametocytes elongate, often broader 

 than in P. elongatum; merozoites 8-14 pigment granules, often 

 oval, clumped; canaries not susceptible. 



P. circumflexum Kikuth (Fig. 200, j-m). In red- winged black- 

 bird, cowbird, and Juniper thrush, schizogonic cycle completed 



Fig. 200. a-d, Plasmodium nudeo-philum (a, b, schizonts; c, micro- 

 gametocyte; d, macrogametocyte), X1330 (Manwell); e-i, P. polare 

 (e-g, schizogony; h, microgametocyte; i, macrogametocyte), X1330 

 (Manwell); j-m, P. circumflexum (j, k, schizonts; 1, microgametocyte; 

 m, macrogametocyte), X1330 (Manwell); n-s, Haemoproteus lophortyx 

 (n, o, microgametocytes; p, microgamete; q, macrogametocyte; r, 

 macrogamete; s, ookinete), X1690 (O'Roke). 



in 48 hours; merozoites 13-30; small pigments scattered; game- 

 tocytes elongate, ends may curve about host cell-nucleus; sexual 

 cycle in Theobaldia annulata and T. melaneura. 



Family 2 Haemoproteidae Doflein 



Schizogony occurs in endothelial cells of vertebrates; mero- 

 zoites penetrate into circulating blood cells and develop into 

 gametocytes; if blood is taken up by specific blood-sucking in- 

 sects, gametocytes develop into gametes which unite to form 

 zygotes that undergo changes similar to those stated above for 

 the family Plasmodiidae. 



