370 Recently published Ornithological Works. 
“The fact is, really, that the tenth (first) primary is not 
absolutely wanting in the f nine-primaried 3 Passeres, bat 
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 3 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. Sen 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. Lwoff on the Histology of Feathers. 
[Beitriige zur Histologie des Haares, der Borste, des Stachels und der 
Feder. Von W. Lwoff. Bull. 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 Cumberland critically studied, including some notes on 
the Birds of Westmoreland. By the Rev. II. A. Macpherson, M.A., and 
William Duckworth. Carlisle : 1886. 8vo.] 
This work forms a natural complement to Mr. MitchelFs 
