On the Avifauna nf Central America. 761 



Dicrurus annectans. 



Dicrurns annectens (Hodgs.) ; Sharpe, Cat. iii. 1877, 

 p. 231. 



a. \ ^ imm. Klong Menao, S.E. Siam. 12 Jan., 1915. 



" Iris crimson l)ro\vn; bill and feet sooty black.'' — C. B. K. 



The specimen is quite immature, but judging by the more 

 even tail it appears to be referable to this species. D. ater 

 (Hermann) is much the commoner bird in Siam, the present 

 species being probably only a winter visitor. 



Corvus macrorhynchus. 



Co7'viis macrorhi/nchus Wagl ; Robinson & Kloss, Ibis, 

 1911, p. 71 : Gyklenstolpe, p. 18. 



a, b. 1 cJ , 1 ? . Ok Yam, Franco-Siamese Boundary (on 

 coast). 3 Jan., 1915. 



" Iris dark ; bill and feet black. Occurring in moderate 

 numbers about the villages, but nowhere so numerous as in 

 Bangkok."— C. B. K. 



These specimens are rather small and dull in colour, with 

 the throat hackles poorly developed ; they belong to this 

 species and not to Corvus compilator Richmond (C. enca, 

 auct.). 



XXXVIII. — The Avifauna of Central America : a Study in 

 Geographical Distribution. By W. P. Pycraft, British 

 Museum, Natural History ^. 



The composite character of the Avifauna of Central 

 America — the admixture of elements from the adjacent 

 land-areas north and south thereof — is a feature which 

 experience of the phenomena of geographical distribution 

 would lead us to expect. No less readily would it have 

 been possible to foretell that this region would show a 

 greater affinity with South than with North America. The 

 following review is therefore more particularly designed 

 to furnish an analysis of the component elements of this 

 Avifauna, in order, if possible, to discover the factors which 

 have determined its composition. 



* rubli.'lied by permission of tlie Trustees of the British Museum. 



