26 



Queensland birds. In the present paper, however, an instance 

 of infection in a spiny-cheeked honey-eater as far south in New 

 South Wales as Yanco is recorded. We have detected 

 MicrofiUinar in birds from Queensland and New South Wales. 



In this paper, as in previous papers, a list of birds, whose 

 bloods have yielded negative results in our hands when micro- 

 scopically examined, is given. 



We have now examined 160 species of Australian birds', 

 comprising 339 individuals, for haematozoa with negative re- 

 sults. In the list of species in this paper giving the negative 

 results I have indicated those species from which we had 

 previously obtained haematozoa. We have now detected the 

 presence of Halferidia in 32 species of Aus-tralian birds: 11 of 

 these are mentioned in the present paper, the host in six 

 instances being new. We have met with the genus Flasmodiuin 

 in several span'ows captured in the neighbourhood of Sydney. 

 A parasite of the black swan, forwarded to us by Dr. Bancroft, 

 of Queensland, contains a large intracellular parasite, which 

 we have provisionally placed in the genus Fho^iyindium , though 

 possibly it should be referred to Halt ( rid iuni. These parasites 

 are in general oval, but occasionally show a tendency to assume 

 a halter form. No schizonts were detected to enable the matter 

 to be settled. We have found the presence of trypanosomes 

 in eight s|>ecies, three of which are referred to in the present 

 paper, two of them being new hosts, though in one of these two 

 we had previously found Lencoci/tozoa. Tjeiicocytozoa have 

 been detected in ten species, of which four are included here, 

 two being new hosts. In five species trypanosomes and 

 Lcurociiiozoa have both been detected, in three species 

 trypanosomes alone, and in five species Leiicocytozoa alone. 



From these figures it will be seen that tr3''panosomes and 

 Leucoryfnzoa are often present in the same species of bird, and 

 even in the same individual bird. This fact may be due merely 

 to the coincidence that the one invertebrate host will serve 

 for the transmission of both parasites to the avian host. On 

 the other hand, it may indicate what we have suggested in 

 previous" papers — viz., that the Leucocifiozoon is an intra- 

 cellular phase of the trypanosome. At present it seems 

 advisable to record the intracellular bodies as separate para- 

 sites, though in our previous papers they were included under 

 the heading "Trypanosomes." Parasites of this nature are 

 known from other parts of the world, and are generally con- 

 sidered as in no way related to trypanosomes. 



The following list indicates those species harbouring one 

 or both of these blood parasites, and the number of individuals 

 in which they have been found : — 



