1 92 1.] TtecentJy jmhlished Onnt.hologicol Works. 559 



Columl)ia to southern California, and exhibit considerable 

 variation, not only in plumage but in so-called structural 

 characters, such as size of bill and lengtli of tail. Nearly 

 all the western races winter in California, and so great is 

 the variation and so many are the intermediate forms that' 

 great confusion has arisen and collectors have great difficulty 

 in identifying individual examples. 



Mr. Swarth has therefore prepared this very elaborate 

 and detailed memoir to clear up the many difficulties 

 encountered, and has examined about 1800 specimens, 

 including the types of fourteen of the sixteen races, in the 

 course of his work, which is obviously of a most accurate 

 and detailed character. Four of the more distinct races are 

 illustrated by a beautiful plate by Major Allan Brooks; the 

 other plates are from photographs of the characteristic 

 scenery of the haunts of the birds. 



Apart from its usefulness to Californian ornithologists, 

 the paper deals with numerous interesting problems of 

 variation, distribution, and migration. 



Sivarth on the Birds of Arizona. 



[Birds of the Papago Saguaro National Monument and the neigh- 

 bouring region, Arizona. By H. S. Swarth. Dept. Interior. National 

 Park Service, pp. 1-63; S pis. Wasliington (Govt. Printing Office) 

 1920. 8vo.] 



The Papago Saguaro National Monument is a tract of 

 land a few miles east of Phoenix in Arizona, set aside to 

 conserve certain types of desert vegetation in a region where 

 increased settlement is rapidly changing the appearance of 

 the land. Some eighty miles further east is a large artificial 

 storage reservoir for irrigation purposes, known as Roose- 

 velt Lake, with a bird reservation around it, and the whole 

 region is attracting increasing numbers of visitors for its 

 unique and romantic scenery. This little pamphlet is a 

 guide to the bird-lovei' who visits this region, and has good 

 accounts of the more common birds to be met with and 

 a list of all those likely to be seen. The National Monu- 

 ments in the United States are now 24 in number and are 



