206 Recently published Ornithological Works. [Ibis, 



[Five new Species of Birds from Cave Deposits in Porto Eico. 

 By Alexander Wetmore. Proc. Biol. Soc. Washing'toii, vol. 33, 1920, 

 pp. 77-82.] 



[Colour of Soft Parts iu Anhinya anldnga. Id., ibid. pp. 182-3.] 



[Further Notes on Birds observed near Williams, Arizona. Id. 

 Condor, xxiii. 1921, pp. 60-64.] 



Where the Bear river enters the Great Salt Lake of Utali 

 there is considerable deltaic region of marsh, the favourite 

 resort of innumerable Ducks, both during the breeding- 

 season and subsequently, Mr. Wetmore has spent three 

 summer seasons engaged on field-work with the wild 

 duck in this locality, and the first of this list of papers is 

 his report. The two most abundant breeiling species are 

 the Redhead (Marila americana) and the Cinnamon Teal, 

 which make up more than half the total number of 

 individuals. Mr. Wetmore estimates that there are at 

 least 1700 breeding pairs of the former species. Many 

 other Ducks come into this region after the nesting-season 

 between July and September to undergo the postnuptial 

 moult, and others again to spend tlie winter after the 

 commencement of October. Mr. Wetmore finds that tlie 

 food most attractive to the ducks is sago pond-weed 

 {Potamogeton pectinatus) and the bayonet grass (Scirpus 

 paludosus), though they also devour large quantities of a 

 brine shrimp [Artemesia] and an alkali fly {Ephijdra). 



The second paper on the list contains descriptions of five 

 new forms based on semi-fossil limb-bones of birds faund 

 in Cave deposits of Porto Rico, of the genera Polyhorus, 

 GaUinago, Oreopeleia, Tyto, and Corvus. 



In the third paper is a careful description of the colour 

 of the soft parts of the American Darter, based on an 

 example killed by the author near Cape Sable in Florida. 

 No one appears to have paid much attention to this matter 

 since the time of Audubon. 



The last paper on the list is an additional account of the 

 birds of Williams in northern Arizona, supplementary to 

 one published in 1908 by Mr. Wetmore (Kansas Univ. Sci. 

 Bull. vol. iv. pp. 377-388). The total number of species 

 observed by the writer is 65. 



