330 URIA LACRYMANS. 



across and for the space of an iiicli, are mottled with white. 

 The tips of the secondary quills also are white, and that 

 colour occupies the throat, the fore part and sides of the 

 neck, and all the lower parts, the feathers on the sides under 

 the wing, however, being streaked with grey. The feathers 

 on the lower surface of the wing also are white, the primary 

 coverts only being very pale-grey. The bill is rather slender, 

 much compressed, its upper outline very littled decurved, the 

 angle of the lower much farther from the base than in the 

 Common Guillemot, its dorsal line straight. There are 

 thirty-five scutella on the middle toe, as in U. Troile, but 

 the Avebs are full, their margins being straight. The wings 

 are remarkably short. 



Length 15 inches; wing from flexure T-jV ; tail 1^; bill 

 along the ridge 1-^ ; along the edge of lower mandible 9^-^ ; 

 its height at the angle -^ ; tarsus 1^ ; middle toe ly^^j-, its 

 claw -p§-. 



Another specimen, having the bill a little longer, more 

 attenuated toward the tip and of a darker colour, wants the 

 white ring and line ; but is in every other respect exactly 

 similar, the tint of the grey colour on the upper parts being 

 only paler. It is impossible to imagine that the two are not 

 of one and the same species. 



Length 16 inches ; wing from flexure 1-^ ; tail l^^ ; bill 

 along the ridge \^-^ ; along the edge of lower mandible 2^-1 ; 

 its height at the angle -f^ ; tarsus l-j4 ; middle toe 1-^, its 

 claw -j%. 



