THE BIRD BOOK 
Xantus Murrelet 
Mandt’s Guillemot 
is entirely black except the wing coverts which 
are white. The bases of the greater coverts, 
however, are black, this generally breaking the 
white mirror as it is called. The under sur- 
faces of the W'ings are white. Legs red. These 
birds breed abundantly on the rocky islands 
and high cliffs along the coast. Soon after 
the first of June the eggs are laid in the crev- 
ices of the rocks and sometimes upon the bare 
ledges. Two or three eggs make the set. The 
ground color is a pale bluish or greenish white 
and the markings are various shades of brown 
and black. Size 2.40 x 1.60. Data. — Grand 
Manan, June 15, 1896. Two eggs laid in a 
cavity back of large boulder. No nest. Collec- 
tor, D. H. Eaton. 
26. Craveri’s Murrelet. Brachyramphus craveri. 
Range. — Both coasts of Lower California, breed- 
ing chiefly on the Gulf side. Craveri Murrelet is 
very similar to the last except that the under sur- 
faces of the wings are dusky. Breeds on the is- 
lands near Cape St. Lucas, burrowing in the 
ground as do most of the others of this species. 
They lay a single egg, the ground color of which 
is buff; they are quite heavily blotched with 
brownish. Size 2.00 x 1.40. 
Bluish white 
Black Guillemot 
27. Black Guillemot. Cepphus grylle. 
Range. — Coasts and islands of the North At- 
lantic, breeding from Maine northward to south- 
ern Greenland. Guillemots are larger birds than 
the Murrelets (length 13 inches) and their plum- 
age is entirely different. This species in summer 
