1919-] Recently published Oi-nithological IVorks. 137 



tation on the forms of Rosso7'nis, and a comparison with 

 the decisions of Rothschild and Hartert on the subject ; 

 eventually the Australian i/orki and keatsi, with the 

 Bornean salvadot'ii, are granted subspecific rank, as well as 

 the Australian coincidens and rogersi and the extralimital 

 aruensis from the Aru Islands, the last two being new 

 subspecies. Several other forms are enumerated, and raise 

 the total to fourteen or more, even without those from New 

 Guinea and New Britain. 



There is no general discussion prefixed to the Micro- 

 podiformes (Swifts) ; possibly it is postponed until this 

 section is concluded. 



Mr. Mathews still uses the generic term Zoonava for 

 Collocalia francica and C. fuciphaga, and under this head 

 comments on the recent work of Ogilvie-Grant, Hartert^ 

 Oberholser, and Stresemann ; but we cannot here tabulate 

 the many subspecies, and must be content to state that he 

 accepts Oberholser's Aerodramus for innoniinata of Hume. 



Under Hirundinapus the author further criticizes the work 

 of his predecessors, and refuses (with Oberholser) to com- 

 bine the genus with C/i(etura. He considers that there are 

 two main groups, of larger and smaller species ; while he 

 admits the separation of the genera Streptoprocne^ Palltnia^ 

 Rhaphidura, and Mearnsia, adding as new, Telacanthura for 

 ussheri, Neafrapus for cassini, Alter apus for sabini, Jndicapus 

 for sylvaticus, Zoonavena for grandidieri, Papuanupus for 

 nov(ii-guine(B , Chaiturellus for rutdus and another. 



It may be observed that both Hirundinapus caudacutu» 

 and Micropus pacificus are represented in the Watling 

 drawings. Of the latter the plumages ai'e not sufficiently 

 well known to justify subspecies, and even colclouyhi 

 Mathews is dropped. 



Mr. Mathews finds the Cuculiformes too heterogeneous 

 and diverse a group to consider in connection with extra- 

 limital forms, but to many readers the articles on the 

 Cuckoos will be the most interesting in this part, and in 

 particular the notes on the hosts of the Pallid and Fan- 

 tailed Cuckoos by Mr. H. L. White (pp. 307, 318), and the 



