141 



It is stated however by several excellent observers that 

 the difference of size, in this, and several other species of 

 hawks, is due to the effect of the climate, and, that interme- 

 diate forms exist in the Middle States. By An dub on they 

 were considered distinct species, the northern form being 

 called Falco hyemalis, Gm. He also states that they differ 

 greatly in their habits. For the present therefore it may be 

 well to consider the large northern form as a variety, apply- 

 ing to it the name, Buteo lineatus, var. hyemalis, Gm. 



BUTEO PENNSYLVANICUS, Bon. Broad-winged Hawk. Sum- 

 mer visitant. Common. Breeds. A nest found June 

 12th, 1858, contained two eggs nearly hatched. This spe- 

 cies is still more abundant near the Umbagog Lakes, and 

 is apparently the most common Hawk in that vicinity. 



^Measurements made from the specimens while fresh, by the collector. 



