50 
AVES. 
1867, 1868, and 1869, by the officers of the U. S. Geological Exploration 
of the 40th Parallel in charge of Mr. Clarence King. The paper is an 
abstract of that part of the Zoological Report of the Survey relating 
to the character and distribution of the local faunas observed along 
the route of exploration, the Report itself being in the press. After 
giving an putline of the routes traversed by the expedition, and a classi- 
fied list of the localities where the collections were made, the paper is 
divided into a number of sections, in which the birds occurring or breed- 
ing at each station are enumerated. It also contains much information of 
local interest. It must be remarked, that in many instances the author 
uses a trinomial system, without the qualifying ‘ var.’ usual with Ame- 
rican ornithologists. . 
Ridgway, Robert. On Nisus cooperi (Bonaparte), and N. gundlachi 
(Eawrence). P. Ac. Philad. 1875, pp. 78-88. 
. On the Buteonine Sub -genus Craxirex, Gould. Tom. cit. pp. 89- 
119. 
The author divides the genus Buteo into two sub-genera, Buteo proper, 
and Craxirex^ Gould. His observations apply solely to the American 
members of the latter group, which is distinguished from the former 
by having only the three outer primaries narrowed at their extremi- 
ties, instead of four, as is the case in the former. Six American species 
of Craxirex are recognized, and their characters, synonymy, and distri- 
bution given. Some of the descriptions are taken from Sharpe’s Cata- 
logue of Accipitres. 
. Studies of the American Falconidce, Monograph of the Genus 
Micrastur. Tom. cit. pp. 470-502. 
A very complete monograph of this genus, the difficulties of which, 
several ornithologists have during the past few years endeavoured to clear 
up. The author reviews the labours of his predecessors, and explains his 
reasons for dissenting from some of their conclusions. 7 species are 
recognized, one of which is described as new. \^Falconid(B.'\ 
Rivi^JRE, ]^. Faune quaternaire des cavernes des Baousse-Rousse, en 
Italie, dites grottes de Menton. C. R. Ixxxi. pp. 346-348. 
A number of birds’ bones belonging to the Orders Accipitres, Passer es^ 
Columhce, Gallince, and Anseres are mentioned as having been found in 
these caves. 
Rosenberg, C. B. H. von. Reistochten naar de Geelvinkbaai op 
Nieuw Guinea in de Jaren 1869 en 1870. s’Gravenhage : 1875, 4to, 
pp. 153. 
In this posthumous work, the author has given an account of his 
travels in the islands of Geelvink Bay, and in the north-western part 
of New Guinea. The birds collected by him were sometime ago 
described by Dr. Schlegel (to whom he transmitted his specimens), in his 
“ Observations Zoologiques.” These descriptions are here reproduced, 
and reduced figures of several of the species are given. 
