432 Messrs. Sclater and Finsch's Index to the 



tion lias been frequently traced between widely different forms, 

 a gradual coalescence in scores of instances having been posi- 

 tively established, and rendered extremely probable in a large 

 number of others." 



There can be no question of the importance of Mr. Allen's 

 investigations, or, in our opinion, that he is perfectly right 

 in regarding the so-called "hybrids" between representative 

 species as in fact transitional forms. 



3. Ornithological Notes from the West. Am. Nat. 1872, 

 pp. 263-275, 342-351, 394-404. 



Resume of observations of birds made during the author's 

 expedition to Kansas, Colorado, and Great- Salt-Lake Valley 

 in 1871. 



4. Notes of an Ornithological Reconnaissance of portions of 

 Kansas, Colorado, Wyoming, and Utah. Bull. Mus. 

 Comp. Zoology, iii. no. 6 (1872). 



Contains the results of field-work, on the western plains and 

 in the central portions of the Rocky Mountains, achieved by an 

 expedition sent out by the Cambridge Museum in 1871 and 

 1872. The expedition commenced work at Fort Leavenworth, 

 Missouri, and collected at intervals thence westward to the 

 Great-Salt-Lake Valley. Lists are given of species collected 

 at eight different stations, with remarks on the different local 

 forms and variations of the species, besides habits and plu- 

 mages. A summary shows that examples of 228 species were 

 obtained. The general result is the confirmation of Mr. Allen's 

 conclusions arrived at in his well-known " Winter-Birds of 

 East Florida" (Bull. Mus. Comp. Zool. ii. no. 3), and the dis- 

 covery of several well-marked geographical races not previ- 

 ously chronicled. 



Allis, T. 



On the Skeleton of the Apteryx. Journ. Linn. Soc. xi. p. 523. 



Notice of the exhibition of two photographs of a mounted 

 skeleton of this bird. 



Altum, Prof. 



Der weissriickige Buntspecht (Picus leuconotus) Brutvogel 

 in der Mark Brandenburg. Zool. Gart. 1872, pp. 369-371 . 



