56 JOURNAL OK MAINE ORNITHOLOGICAL SOCIETY. 



Recent Publications. 



191 1. Nelson, E. W. Description of a New Genus 

 and Species of Hummingbird from Panama. Smithsonian 

 Miscell. Collections, 56: No. 21, pp. 2. 



This new Hummingbird, from the dwarfed forests of the moun- 

 tain, Cerro Azul, Panama, is named Goldmania violiceps. It is known 

 only from 2,500 to 3,000 feet altitude. 



191 1. Year Book United States Department of Agri- 

 culture, 1910. 



191 1. Cooke, Wells W. The Migratory Movements 

 of Birds in Relation to the Weather. Year Book U. S. 

 Dept. Agriculture, 1910, pp. 379, 390, and a map. 



In this paper Mr. Cooke says, by way of conclusion: "The fore- 

 going facts show conclusively that the weather conditions are not 

 the cause of the migration of birds, but that the weather, by influ- 

 encing the food supply, is the chief factor which determines the 

 average date of arrival at the breeding grounds. Migration is under- 

 taken in response to physiological changes in birds, and the date of 

 starting, in the case of most species, bears no relation whatever to 

 the local weather conditions in the winter home. The weather 

 encountered en route influences migrations in a subordinate way. 

 . Spring migration usually occurs with a rising temperature, 

 and the movements of autumn with a falling temperature. In each 

 case the change seems to be a more potent factor than the absolute 

 degree of cold. . . . Each species, and each group of individ- 

 uals of a species, is a law unto itself." 



191 1. McAtee, W. L,. Our Grosbeaks and Their Value 

 to Agriculture. Farmers' Bulletin No. 450, U. S. Dept. Agri- 

 culture, pp. 14, and three cuts. 



Treats of the food habits of Rose-breasted, Cardinal, Black- 

 headed, Blue and Gray Grosbeaks, means of preventing damage to 

 crops by Grosbeaks, and how to attract and protect Grosbeaks. 



In conclusion we are told, "The services of Grosbeaks in 



