natural, history

efractory to Giemsa, and H. meliornis (Cleland & Johnston, 1909) is characterizedby its amoeboid outline and the frequent presence of several individuals at differentstages of de .. elopment within one cell. CLELAND (1915) mentioned a notable scarcityof pigment in a haemoproteid from Melithreptus validirostris, and characterized aspecies from My:::omela sanguineolenta as having from one to a few large grains ofpigment and surrounding the host cell nucleus "leaving only a thin rim of protoplasmexternally". Although none of these descriptIOns are full enough for comparativepurposes, and the evidence suggests that more than one species of Haemoproteusparasitize honey-eaters, the species from M. sanguineolenta certainly seems close tothe one under discussion.Similarities between the Rennell honey-eater parasite and those from relatedhosts in Australia, indicate the need for further studies of these haemoproteids in thelatter country. Such studies might well reveal synonymy, but as the present parasitecannot be referred with certainty to any of those already described from closelyrelated or other hosts, it must be accorded provisional recognition as a distinctspecies. The name allotted to it, Haemoproteus clelandi n. sp., recognizes the contributionsof Professor J. BURTON CLELAND to our knowledge of Australian haematozoa.,"Haemoproteus johnstoni n. sp. (PI. II. Figs. 20-27).P1osts: Woodfordia superciliosa ( 1/1): Zosterops rellne/liana (I, I ).Erythrocytes of W. superci/iosa normally measure 10.2 to 11.8 fl (av., 11.0 fl.)by 5.5 to 7.3 fl (av., 6.2 fl.). When parasitized by this haemoproteid they becomedistended lengthwise, measuring 11.4 to 13.3 fl (av.. 12.2 fl.) by 5.1 to 7.5 fl (av.. 6.3 fl).The percentage increase in length is II 0 0, but the \\'idth is not significantly altered.Lateral displacement of toc nucleus had taken place in 25 (50 ~o) of the parasitizedcells measured. Only five of the 25 displaced nuclei had moved altogether beyond thecentral third of the erythrocyte. and only one of them was in contact with the ceIlmembrane.Normal red cells of Z. renlle/liana measure 10.2 to 12.4 fl. (av.. 11.4 fl) by 5.9 to7.3 fl (av., 6.5 fl). parasitized ones 11.2 to 13.1 ~t (av.. 12.4 fl.) by 5.5 to 7.1 fl (av..6,3 fl.). In this case the percentage increase in length amounts to 9 °0' and once againthere is scarcely any effect on the width of the cell. Lateral displacement of the nucleushad taken place in 28 (56 () 0) of 50 infected cells. but only eight of the 22 displacednuclei had moved right out of the central third of the erythrocyte. and none of themwere touching the cell membrane .• Parasites from the two hosts differed slightly in regard to the number of pigmentgra,\~es (see below). but agreement between them was otherwise complete. Thedescription which follows was made from one of the J·Voodfordia slides.Developing and mature gametocytes occupy all the space on one side of the nucleusbetween this structure and the cell membrane. None of them are of irregular outline.A distinctive type of gametocyte. which occurs plentifully. is illustrated in Figs. 22(microgametocyte) and 27 (macrogametocyte). These parasites engulf. or all but engulf,the host cell nucleus. The rounded outline of their extremities is lost, the side