LEUCOCYTOZOON. 239 



host-cell, the microgametocyte producing the microgametes 

 by a process of flagellation and the macrogametocyte rounding 

 o£F to form a macrogamete. Finally, a large unpigmented 

 ookinete is formed. Blood parasites of various birds. 



Remarks. — ^Wenyon (1926) gives a useful summary of the 

 previous Hterature on this genus and places it in the same 

 family with Heemoproteus, from which it differs chiefly in the 

 absence of pigment in the gametocytes and the peculiar modi- 

 fication of the host-cell. Reichenow (1931), stressing the 

 affinities with the Coccidia, places it in a family by itself 

 under Eimeridba. I have followed Wenyon, Kudo, and 

 Calkins in placing it here. De Mello (1937 a) has surveyed 

 the previous literature deahng with the genus, and come 

 to the conclusion that species with a rounded form should be 

 placed in an independent genus from Leucocytozoon, which 

 should be restricted to the fusiform species. 



196. Leucocytozoon ardeolse de Mello. 



'\ Leucocytozoon ardeolse, de Mello, 1937 a, p. 106. 



Form round. No sexual differentiation made out. Cyto- 

 plasm with very minute alveoli, staining deep blue with 

 Leishman's stain ; nucleus circular, staining pale rose. 



Habitat. — Blood of Ardeola grayi Sykes : Portuguese 

 India. 



197. Leucocytozoon chloropsidis de Mello. (Fig. 119.) 



\ Leucocytozoon chloropsidis, de Mello, 1935 a, pp. 356-7, pi. xliii, 

 fig. 2 ; 1937 a, p. 105. 



Form round or oval. Cytoplasm alveolar. Sexual dimor- 

 phism of the gametocytes not shown by the cytoplasm, which 

 stains deep blue in both the male and female, but by the 



A B 



Fig. 119. — Leucocytozoon chloropsidis de Mello. 

 A, female gametocyte ; B, male gametocyte. (After de Mello.) 



appearance of the nucleus. In the male gametocytes the 

 nucleus is long, thread-like, irregular, and stains violet by 

 Eiomanowsky stains. In the female gametocytes the nucleus 



