432 J. B. CLELAND AND T. H. JOHN'STON. 



evenly throughout. The extremities were almost alike* 

 both being broadly rounded. In a few embryos, the tail 

 end was slightly narrower than the rest of the body. (Figs. 

 55, 56.) 



(7) Microfilaria sp. from the White-rumped Wood-swallow, 



Artamus leucogaster, Valenc. (Dr. Bancroft, Eidsvold, 



April 1911.) 

 Length 90 to 120 /*, breadth 4 /*. Each end was bluntly 

 rounded, the tail tapering slightly. Annulations were 

 readily recognisable. The nerve ring lay in the anterior 

 sixth and the excretory spot in the fourth sixth of the body. 

 (Figs. 50, 51.) 



(8) Microfilaria sp. from the Wood-swallow, Artamus 



tenebrosa, Lath. (Dr. Bancroft, Eidsvold, Febr. 1911). 

 Length 120 /*, breadth 5 ft. Very few parasites were 

 detected. The head end was somewhat truncate, the tail 

 end gradually tapering to terminate bluntly. Transverse 

 striae were not recognised (figs. 72, 73). This form is prob- 

 ably specifically identical with that found in Artamus 

 leucogaster. 



(9) and (10) Microfilaria sp. from the Butcher Birds Crac- 



ticus nigrigularis, Gould (L. Harrison, Gladstone, Oct. 

 1910), and C. destructor, Temm. (Dr. Bancroft, Eids- 

 vold, April 1911). 

 The two above mentioned species of Cracticus were found 

 to be parasitised by a short thick microfilaria possessing 

 distinct annulations. Each extremity was bluntly rounded, 

 the tail being only slightly narrower than the head in most 

 of the specimens seen. In a few (from C. nigrigularis) the 

 tail was rather more pointed. The length of the embryo 

 varied from 80 to 110 /*, the breadth being from 5 to 6 p. A 

 few smaller forms of 58 /* by 2*5 /* possessing a somewhat 

 pointed tail were seen in the film from C. nigrigularis. The 



