1879.] paper on the fruit-pigeons. 63 



26. Ptilopus trigeminus. 



I question whether Mr. Elliot, who says that it may well be doubted 

 if P. trigeminus should be separated from P. geminus, has ever seen 

 a specimen of P. trigeminus. He says that the only difference is in 

 the slightly paler crown. The case is quite the contrary. I have 

 seen one specimen in the British Museum (Wallace's collection), 

 most hkely from Sorong, a second from Salwatty in Gould's collection, 

 and many in the Museum of Leiden. They differ from P. geminus 

 in the brighter crown, in the paler throat, in the saffron-colour round 

 the violet spot of the abdomen being much reduced, and in the yellow 

 of the lower part of the abdomen being less extended. In fact, as 

 regards the pale violet crown, P. trigeminus is intermediate between 

 P. coronulatus with a hriglit violet crown, and P. geminus with a 

 pinkish, nearly white crown. 



27. Ptilopus iozonus. 



The habitat of this species is the Aru Islands and south of New 

 Gruinea. 



29. Ptilopus jobiensis. 



The synonymy given is not exact ; Mr. Rowley and I used the 

 binomial name, and not a trinomial name like Schlegel. 



This species, rather than approaching P. humeralis, is allied to P. 

 iozonus, of which it is the northern representative. P. humeralis differs 

 from both in the deep purple band on the small wing-coverts, whereas 

 these both in P. jobiensis and P. iozonus are grey- violet ; P. jobiensis 

 differs from P.jozonus in having the tail above uniform green; in P. 

 iozonus the tail has a very conspicuous apical grey band. 



P. jobiensis lately has been found also in Tarawa! or D'Urville 

 Island (Atti R. Ac. Sc. Tor. xiii. p. 321). 



31. Ptilopus nanus. 



This species has been obtained by D'Albertis on the Fly River 

 (Ann. Mus. Civ. Gen. ix. p. -43) ; and I think that it is confined to 

 the south of New Guinea and Mysol. 



32. Ptilopus monachus. 



Mr. Elliot says that the birds from Ternate diiFer from those of 

 Gilolo, and that the Gilolo bird may require separation. Mr. Gray 

 in his ' Hand-list ' had already mentioned that the specimens from 

 Gilolo belong to a variety. I may say that I have seen many speci- 

 mens from both localities, and that I have not been able to detect 

 any real difference. 



34. Ptilopus melanocephalus. 



The locality Sula-bessie does not belong to this form, but to P. 

 chrysorrhous. 



1 cannot offer any additional remark on the specimens from Flores 

 (P. melanauchen, Salvad.) ; but I think that they belong to a form 

 equivalent to P. melanocephalus, P. nielanospilus, and P. chrysor- 

 rhous. 



