538 BLACK TERN. 



Young Male in Autumn. Plate CCLXXX. 



The bill, iris, and feet nearly as in the adult. The upper parts are 

 greyish-blue, the feathers of the fore part of the back, and especially the 

 scapulars, brown towards the end ; the upper and hind part of the head 

 greyish-black, of which there is a darker mark behind, and another before 

 the eye ; the forehead greyish- white, as are the sides of the head, the fore 

 neck, the breast, and the abdomen ; the sides dusky grey ; the lower wing- 

 coverts greyish-white. The quills are darker towards the end, and the 

 first primary is black along the outer web. 



Length to end of tail 7| inches, to end of wings 9t\ ? wing from 

 flexure 7| ; tail 2^§ ; bill along the ridge H, along the edge of lower man- 

 dible Iys; tarsus ^'| ; middle toe ^^, its claw ^'g. 



