94 Mr. IT. A. Bay] is on a new Species of 



basal patch ; a heavily dented and strongly curved postmedian 

 line ; a subapical triangular brown patch, succeeded by an 

 intraneural series of large brown subterminal patches ; cilia 

 conspicuously chequered with white and brown. Hind wing 

 dull brown, paler than fore wing, with three darker indica- 

 tions of transverse bands near base ; basal area pale brownish 

 grey. Abdomen with a broad greyish-black dorsal stripe and 

 subdorsal black and white patches ; at base of first segment 

 subdorsal tufts of orange. Thorax blackish brown. Abdo- 

 men below pale, whitish. 



Expanse 100-110 mm. 



Hob. Tenimber Island (W. J. Frost), 1918 ; 2 ? ? . 



Type in Coll. Joicey. 



XIII. — Anew Species of the Nematode Genus Crossocephalus 

 from the Rhinoceros. By H. A. Baylis, M.A. 



(Published by permission of the Trustees of the British Museum.) 



The genus Crossocephalus has hitherto been known only 

 from its type-species, C. viviparus (v. Linstow) *, which 

 occurs in the zebra. I have now to place on record a second 

 form, parasitic in a rhinoceros (R. sumatrensis) from the 

 Malav Peninsula. The material at my disposal is unfortu- 

 nately not in the most perfect state of preservation, but it 

 serves for the purpose of a brief description, and is sufficient, 

 in my opinion, to warrant the erection of a new species. 

 Incidentally it also throws some light on a matter which has 

 been a source of confusion in the descriptions of C. viviparus, 

 viz., the structure of the very complicated and peculiar 

 mouth-apparatus. 



Crossocephalus longicaudatus, sp. n. 



Host : Rhinoceros sumatrensis. 



This is a short, stout little worm, tapering rather suddenly 

 at the anterior end, in the region of the oesophagus. The 

 male measures about 7 mm. in length and 0*5 mm. in 

 maximum thickness, the female 9 to 10 mm. in length and 

 about 0'63 mm. in thickness. The cuticle has very fine 

 transverse striatums. There are no lateral ala3. The mouth 

 is provided with six chitinous jaws (fig. 1, J), each of which 

 bears a row of bristles externally, and a sharp, slightly curved 



* Pterocephalus viviparus, v. Linst., 1899; Crossocephalus viviparus, 

 Railliet, 1909. 



