101 



tfrom another (if the differences are of specific rank), and these 

 again from the descriptions of H. danilewskyi available to 

 us.< 3 > This difficulty has been accentuated by reading various 

 recent papers in which the writers describe H. danilewskyi as 

 occurring in different birds, and sometimes hint that probably 

 more than one species is incorporated under this name. We 

 see only one way out of this difficulty, and that is to describe 

 ^s fully as the material available will permit, the various 

 parasites discovered in any particular bird. 



Before passing on to describe the additional Halteridia 

 we have found, we may first of all refer to some of the out- 

 standing features of the first five forms we have described, the 

 only Halteridia hitherto, we believe, found in Australian 

 birds : — 



H. meliomis (from Meliomis novce-hollandice, Lath.) was 

 specially noticeable for the number of small forms, 

 sometimes as many as seven, in one red cell. 

 H. philemon (from Tropidorhynchus corniculatus , Lath., 

 syn. Philemon corniculatus, Lath.) showed a pro- 

 toplasm often highly granular. 

 H. geocichlce (from Oreocichla lunulala, Lath., syn. 

 Geociclda lunidata) presented special appearances 

 in its gametocytes. 

 H. ptilotis (from Ptilotis chrysops, Lath.) did not pre- 

 sent any special outstanding features. 

 H. nettii (from Nettium castaneum, Eyton) had remark- 

 ably large pigment masses, and was a very large 

 parasite. 

 All these apparent differences may, it is true, only be 

 stages in the life-history of one species of parasite. 



Halterjdium, sp, from Pomatorhinus superciliosus 

 (Fam . Timeliidce) . 



Plate xxv., figs. 1-5. 



The bird, the victim of this parasite, was shot at Hallett 

 Clove, < 4 > near Adelaide, in May, 1910, in company with several 

 other birds which did not show the presence of haematozoa. 

 Two further examples of this species of bird, shot at Tailem 

 Bend, in South Australia (about 50 miles from the above 

 locality), were not infected by it. The discovery of haematozoa 

 in a South Australian bird is, we believe, now recorded for 

 the first time. 



(3) Cardamatis (Centr. f. Bakt., Orig., lii., 1909, pp. 351-368) 

 gives a long list of European birds in which this parasite occurs. 



(4) In the subcutaneous tissues of this bird a number of larval 

 •echinorhynchs were found. 



