ALCID^E — THE AUKS — CERORHYNCHUA. 



521 



sides smoky plumbeous ; lower parts white, usually faintly clouded with smoky gray. A row of 

 straight white filamentous feathers alung each side of the occiput, originating just behind and above 

 the eye ; another row of similar but larger feathers across the cheeks, from the rictus back. Bill 

 dull orange, the culmen, with anterior and posterior edges of the horn, black ; legs and feet pale 



Summer adult. 



yellowish brown (in skin), the webs and claws dusky ; iris hazel (W. A. Cooper, MS.). Adult, 

 in winter {= " Gerrohina SucUeyi," Cass , " Sagmatorhina Suckleyi," Coues) .• Exactly like the sum- 

 mer plumage, but breast more uniformly smoky gray, the abdomen more uniform white ; horn-like 

 process of the nasal shield and mandibular jjrocess entirely absent. Young, first j)lumage : Similar 

 to the adult, but white filamentous feathers of the head entirely absent, maxillary horn wanting 



Winter adult. 



or imperfectly developed, the bill smaller and of a dusky brown color. Downy young : Uniform 

 sooty grayish brown, lighter than the corresponding stage of Lunda cirrhata, and with slenderer 

 bill, but otherwise very similar. 



Total length, about 14.00-15.50 inches ; wing, 7.25 ; culmen, from cere or anterior edge of horn, 

 1.00 ; height of horn from nostril, .75 ; tarsus, 1.10-1.20 ; middle toe, with claw, 1.80-1.90. 



The Horn-billed Guillemot, once supposed to be a very rare species, lias been 

 found by recent explorations to be quite common, not only on our western coast, 



VOL. II. — (Ui 



