pe Recent Literature. 332 
Cooke’s Birds of Colorado.'—In this Bulletin of 143 pages, Prof. 
Cooke, attempts ‘“‘ to set forth our present knowledge of the distribution 
and migration of Colorado birds. There is also included a bibliography 
of the subject and an historical review of the progress of ornithological 
investigation in this State.” The total number of species and subspecies 
thus far known from the State is 363 (see p. 128), of which 230 have been 
found breeding within the State. The records given ‘are based first of 
all on all the printed matter that has appeared dealing with the birds of 
Colorado. This mass of material has been supplemented by much 
manuscript matter, and by personal observations of the author during 
a four years’ residence in the State. . . . The only claim for completeness 
made by the present list is that it is complete so far as work done up to 
this time is concerned. Experience in this State as well as in others 
teaches that additions will be made for many years to come.” As the 
writer says, many parts of the State havé never been visited by an 
ornithologist, including many areas of large extent; the work thus far 
done has been limited to “the region along the eastern base of the foot- 
hills,” ‘‘thirty miles wide and one hundred and fifty miles in length,” 
to which “four-fifths of all the records of Colorado pertain.” There is 
thus, as Prof. Cooke emphasizes, inviting fields here for further ornitho- 
logical research. 
A few pages are given to the topography and climatology of the State, 
followed by acknowledgments to collaborators for valued assistance. 
Next follows a series of twelve lists classifying the birds in accordance 
with the nature of their occurrence, as residents, winter visitants, etc., 
A tabular statement of dates of arrival (pp. 18, 19) is then given for four 
points, — St. Louis, Mo. ; Fort Lyon, Loveland, and Idaho Springs, Col. 
An annotated ‘ Bibliography of Colorado Ornithology ’ occupies pp. 20-39, 
numbering 182 titles, beginning with Pike, 1807. Then follows ‘The 
History of Colorado Birds’ (pp. 40-48), in which the more important of 
the papers listed in the ‘ Bibliography’ are taken up chronologically and 
further summarized, followed by a tabular recapitulation of the species 
added to the State by the successive authors. The annotated listiof ‘The 
Birds of Colorado’ occupies pp. 49-128, entered under the A. O. U. 
numbers and names. The annotations indicate quite fully the nature of 
the occurrence of each species within the State, including relative abun- 
dance, dates of imigration, and the portions of the State it frequents, and 
where it breeds. No species is apparently included without good evidence. 
A few additional species are given (in brackets in small type) that have 
been taken on the borders of the State, under circumstances that indicate 
their probable occurrence within the limits of Colorado. A very 
full index (pp. 129-143) concludes the paper, which has evidently been 
prepared with great care and thoroughness, and with the expenditure of 
‘The Birds of Colorado. By W. W. Cooke. Bulletin No. 37, State 
Agricultural College, Fort Collins, Colorado, March 17, 1897. 8vo, pp. 143. 
