o4 Maynakd o)i Corifs Shearwater. 



2Dart of the back being so light as to present quite a strong 

 contrast with the wings. In perfectly adult specimens of 

 major the lower neck behind and upper kack are nearly as 

 ashy as in horeaUs^ but lower down on the back this color 

 is confined to the edges of the feathers, producing a scaly 

 appearance in marked contrast with the dark brown of 

 the central portion of each feather. 



The under parts of horealis, even the under wing and 

 tail coverts and axillaries, excepting a slight ashy tinge on 

 the sides of the former and on the shafts of the feathers 

 of the latter, are pure sultry white, whereas major is 

 marked with dusky in a central line along the abdomen, on 

 the central portions of the under tail coverts, in spots on 

 the axillaries, on the under wino; coverts and alono; the 



^ CI G 



sides especially anteriorly. One of the most noticeable 

 differences, however, between the two species may be seen 

 in the ashy markings of the sides of the head and neck. 

 This in horealis extends down on the lower jaw for some 

 distance, thence in a nearly straight line to a point just 

 back of where the bend of the wing touches the body. 

 There is no distinct line of demarkation between the ashy 

 and white, but they gradually shade together. In major 

 the dark color of the upper part of the head does not en- 

 croach upon the lower jaw but ends in an abrupt line about 

 .40 of an inch below the eye. From thence it extends 

 backward in a straight line to the back of the head beyond 

 which the white of the lower part of the neck encroaches 

 in triangular patches on either side. These patches nearly 

 meet behind the neck in young birds, but in adult speci- 

 mens this dusky area between is wider. The dark line 

 of demarkation beyond this triangular patch down to the 

 sides is not as well defined as above, but still does not in- 

 tergrade with the white as completely as in horealis. The 



