370 Recently published Ornitlioloyical Works. 



" The fact is, really, that the tenth (first) primary is not 

 absolutely wanting in the ' nine-primaried ' Passeres, but 

 its size is so extremely reduced as to become quite or nearly 

 invisible in the old birds, the more so since its position is 

 also slightly changed, as it is forced up on the upper surface 

 of the wing. Not so in the young, however. In a very 

 young specimen of the Snow-flake {Plectrophenax nivalis), a 

 ' nine-primaried ' species, now before me, the outermost 

 (tenth) primary is plainly visible in its natural position, and 

 with the corresponding great covert in its proper place ; 

 that is, in the interval between the ultimate and penultimate 

 primaries. From this it will be easily perceived how perverse 

 is the method of counting the primaries from the edge of the 

 wing, since, in nine-primaried birds, the feather which is 

 usually called the first, in reality corresponds to the second of 

 the ten-primaried species. By counting from the secondaries, 

 no difficulty is experienced." 



64. Lawrence on two new Birds from Yucatan. 



[Characters of two supposed new Species of Birds from Yucatan. By 

 George N. Lawrence. Ann. N. Y. Acad. Sci. vol. iii. no. 9, p. 273.] 



On specimens transmitted from Yucatan by Mr. Gaumer, 

 Mr. Lawrence has based two new species, Polioptila albiventris 

 and Chcetura gaumeri. 



65. Lwojf on the Histology of Feathers. 



[Beitrage zur Histologie des Haares, der Borste, des Stachels und der 

 Feder. Von W. Lwoff. BuU. Soc. Imp. Nat. Moscou, 1884, p. 1, 

 taf. v.-viii.] 



This is a German translation of a memoir originally pub- 

 lished in 1883 in Russian. It treats of the minute structure 

 of hair and feathers, and is illustrated by four plates. 



66. Macpherson and Duckworth on the Birds of Cumber- 

 land. 



[The Birds of CumberUiud critically studied, including some notes on 

 the Birds of Westmoreland. By the Rev. H. A. ]\Iacpherson, M.A., and 

 William Duckworth. Carlisle : 188H. 8vo.] 



This work forms a natural complement to Mr. Mitchell's 



