84 J. B. CLELAND AND T. H JOHNSTON. 



In the above list, Nos. 1, 2 and 3, with very faintly 

 stained protoplasm and the melanin collected at the ends 

 of the parasites are undoubtedly early male gametocytes. 

 Nos. 4 and 5 are also probably males. Some at least of the 

 deepest stained examples (e.g. figs. 13 to 20), must be con- 

 sidered as female gametocytes. The melanin here, though 

 sometimes near one or both ends of the parasite, occupied 

 very frequently more central positions and was perhaps 

 greater in amount than in the males. Of the rest, some 

 may be either male or female, but the majority are probably 

 trophozoites. The position of the pigment varied. It 

 must be noted, however, that all stages could be found 

 between the most typical macrogametocytes and micro- 

 gametocytes. Similarly rod shaped masses of melanin 

 were found in all forms. In no instance, with the stain 

 employed (Giemsa's), could the nucleus of the parasite be 

 detected, and no forms were seen in stages of schizogony. 

 The measurements of the red cells of this bird were 11*5 x 

 6/a. Some of the smaller parasites noticed were 5 x 1/x, 

 others still smaller and more spherical. Medium sized 

 parasites, in which the ends had barely begun to embrace 

 the nucleus, measured 12 X 2/*, and large curved forms 14 

 X 3/*, counting in the measurement the curve of the parasite. 



We propose the name of H. philemon (sp. nov.) for this 

 parasite, adopting for the specific name the generic name 

 of the host. This parasite, in the largest forms seen, 

 appears to occupy a relatively greater amount of the cyto- 

 plasm of the host cell than do the largest forms seen in H. 

 ptilotis. Beyond this, little difference could be detected, 

 and the identity or otherwise of the two must await the 

 investigation of other stages in their life-histories. 



The type specimen has been deposited in the Australian 

 Museum Sydney, and the co-type is being retained by the 

 Bureau of Microbiology. 



