HAEMOSPORIDIA 497 



P. cathetnerium Hartman (Fig. 232, c). In English sparrow, cow- 

 bird, red-winged blackbird, and other birds; schizogony in 24 hours, 

 segmentation occurs at 6-10 p.m.; 6-24 merozoites from a schizont; 

 mature schizonts and gametocytes about 7-8/x in diameter; gameto- 

 cytes rounded ; haemozoin granules in microgametocytes longer and 

 more pointed than those present in macrogametocytes; canaries 

 susceptible; numerous strains; common; transmitted by manj' spec- 

 ies of Culex and Aedes. 



P. rouxi Sergent, Sergent and Catanei (Fig. 232, (]). In English 

 sparrow in Algeria; similar to P. vaughani; schizogony in 24 hours; 

 4 merozoites from a schizont; transmitted by Culex. 



P. elongatum Huff (Fig. 232, e). In English sparrow; schizogon,y 

 occurs mainly in the bone marrow, and completed in 24 hours; 8-12 

 merozoites from a schizont; gametocytes elongate, found in periph- 

 eral blood; transmitted by Culex. Chen (1944) made a study of its 

 nucleus. 



P. circumflexum Kikuth (Fig. 232, /). In red-winged blackbird, 

 cowbird and several other birds; growing schizonts and gametocytes 

 form broken rings around the host-cell nucleus; schizogony com- 

 pleted in 48 hours; 13-30 merozoites from a schizont; gametocytes 

 elongate, with a few haemozoin granules; transmitted by Culex and 

 Theobaldia. 



P. polare Man well (Fig. 232, g). In cliff swallow {Petrochelidon I. 

 lunifrons); grown schizonts at one of the poles of host erythrocytes; 

 8-14 merozoites from a schizont; few in peripheral blood; gameto- 

 cytes elongate. 



P. nudeophilum AI. (Fig. 232, h). In catbird (Dumatella carolin- 

 ensis)\ schizogony in 24 hours; 3-10 merozoites from a schizont; 

 mature schizonts usually not seen in the peripheral blood; gameto- 

 cytes elongate, often seen closely applied to the host-cell nucleus; 

 haemozoin granules at one end. 



P. gallinaceum Brumpt (Fig. 232, i). In domestic fowl {Gallus 

 domesticus) in India; schizogony in 36 hours; 20-36 merozoites from a 

 schizont; gametocytes round, with few haemozoin granules; host-cell 

 nucleus displaced; pheasants, geese, partridges and peacocks are 

 susceptible, but canaries, ducks, guinea fowls, etc., are refractory; 

 transmitted by Aedes. 



P. hexamerium^ Huff (Fig. 232, j). In bluebird {Sialias. sialis) and 

 ^Maryland yellow-throats; schizogony in 48 or 72 hours; grown schi- 

 zonts often elongate; 6 merozoites from a schizont; gametocytes 

 elongate. 



P. oti Wolf son (Fig. 232, k). In eastern screech owl {Otus asio 



