2332 TtiE ZooLoorst— October, 1870. 



in the Museum of the Academy of Sciences, Philadelphia. So far 

 south, in summer, as Cape St. Lucas, Lower California. 



Description (from a female specimen in the Smithsonian Museum, 

 from San Diego, January 27, 1862; a typical example).— Bill along 

 culmen half as long as the skull, three-fourths as long as the tarsus, as 

 long as the middle toe and half its claw, very slender, much 

 compressed, higher than wide at the base ; culmen gently curved its 

 whole length ; rictus nearly straight ; gonys perfectly straight ; outline 

 of the very slender mandibular rami a little concave. Tarsus just as 

 long as the middle toe without its claw ! Tip of inner lateral claw not 

 reaching base of middle one. Wings and tail of usual shape ; the 

 latter contained about two and a third times in the length of the 

 former from the carpus. Under tail-coverts reaching (in this specimen) 

 just beyond the end of the tail. Entire upper parts uniform cinereous, 

 not varied by white. This colour is slightly darker, and more 

 blackish plumbeous on the head. It extends on the sides of the head 

 just to the eyes, the lids of which are of this colour, a little further 

 down on the auriculars ; thence in a straight line along the middle of 

 the side of the neck to the shoulders ; thence in a straight line along 

 the sides under the wings, where it is nearly an inch broad; the 

 elongated feathers of the flanks are also mostly of this colour. Other 

 under parts entirely pure white. Under surface of wings entirely pure 

 white ! Primaries black on the outer web ; the greater part of the 

 shaft and inner webs white ; the terminal portion of the shaft and 

 inner webs brown. Tail-feathers black, the inner webs somewhat 

 brownish. Bill black, the base of the lower mandible whitish ; feet 

 anteriorly dull yellowish, posteriorly dusky, in the present dried state ; 

 "bill black, feet whitish blue, black below" (label). 



"Length 10-50; extent 17o0" (label); wing 4-80; tail TTO; 

 tarsus '95 ; middle toe without claw "95, its claw "20 ; outer toe and 

 claw riO; inner do. '90; bill along culmen "80, along rictus TSO, 

 along gonys "45; depth at base '22; width "19.* 



* The following is ihe original description of the type specimen : — " Bill slender 

 and slightly curved, about half the length of head. Tarsus scarcely shorter than the 

 middle loe [and claw]. Above dark brownish black, the edges of the feathers with a 

 decided plumbeous tinge; the side of neck below, and the axillars with the concealed 

 portion of the sides of the breast, ashy plumbeous. Entire under parts, including 

 tail-coverts and inside of the wings, pure white, this colour extending on the sides of 

 the bead so as to include the eyes; the lids, hoWerer, are tinged with dusky; bill 

 black ; legs apparently reddish in life. 



"Length 10 inches, extent 15-80, wing 470, tail I'SO, bill above -70, gape 1-20, 



