6. OCEANODROMA BELDINGI, Emerson. 



(BELDING'S FORK-TAILED PETREL.) 



Oceanodroma beldingi, Emerson, Condor, VIIL, p. 54 (1906). 



0. beali similis, sed cinerascentior, alis caudaque brevioribus. 



Mr. Emerson has described this species from five specimens in the collection of Mr. 

 Herman T. Bohlman, the actual type being from Netarts Bay on the coast of Oregon. 

 The range of this Petrel is given as the North Pacific Coast, from Vancouver Island to 

 Northern California, breeding on the coast of Oregon and Mendocino County, California. 

 Mr. Emerson describes it as a " handsome new Petrel," and says that it is " similar 

 to 0. beali, but decidedly greyer, and averaging notably smaller in length of wing 

 and tail." The average measurements of five specimens are given by Mr. Emerson as 

 follows : — Wing, 5.65 inches ; tail, 3.22 ; forking of tail, 0.67 ; tarsus, 0.78. 



Comparing these dimensions with those of 0. leucorrhoa, the measurements of a 

 series of the latter species were : — Wing, 5.85-6.34 inches ; tail, 3.20-3.35 ; forking 

 of tail, 0.75-0.90; tarsus, 0.90-0.91 (Emerson, I.e.). The describer of the 

 species gives the following diagnosis : — " Uniform sooty-brown, washed with a bluish 

 slate-grey on the head, throat, chest, and back, the grey most pronounced on the head 

 and chest ; forehead, chin, and upper throat decidedly ashy ; greater and median 

 wing-coverts edged with ashy ; upper tail-coverts white with black shafts ; lateral 

 lower coverts edged with whitish ; rectrices black with white at base." 



Not having examined a specimen of O. beldingi, I have compiled the above descrip- 

 tion from Mr. Emerson's notes. 



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