210 



ORNITHOLOGICAL EXPLORATIOiNS. 



to present the facts as tliey are before me, leaving the question open 

 for future investigation. Any one looking at the Bering Island birds 

 will at once be impressed by tlieir much larger size as compared with 

 specimens from the American continent, the extremely powerful bill and 

 claws being particularly striking, in proof of which I submit the follow- 

 ing tables of dimensions. 1 may remark that the sex is given in paren- 

 thesis, when not verified by Mr.E.Eidgway or myself by dissection, and 

 furthermore that the specimens from the States are the largest ones I 

 could pick out. All specimens with black tails are recorded as young, 

 while those with the rectrices white, or more white than black, are given 

 as adult. 



Table I. — Specimens from Bering Island. 



101198 

 101196 

 92739 

 101195 

 101197 

 92740 

 92741 



Gr. 74 

 Gr. 77 

 St. 1685 

 Gr. 



Gr. 24 

 St. 1783 

 St. 1781 

 Grebn. 

 Grebn. 

 Grebn. 

 Grebn. 



(crtad. 

 (d') jun. 



jun. 



jun. 



(?).jun. 



d jun. 



9 jun. 



jun. 



jun. 



jun. 

 id) ad. 



Locality. 



Bering Island. 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



> B 



Feb., 1884 



Mar., 1884 

 Oct. 15,1882 



Oct., 1883 



Oct., 1883 



Dec. 5, 1882 



Dec. 2, 1882 



mm. 

 635 



650 

 715 

 677 

 705 

 648 

 705 

 680 

 690 

 700 

 600 



Ttim. 

 310 

 34G 

 390 

 350 

 380 

 332 

 370 

 350 

 375 

 370 

 310 



mm. 

 53 

 51 

 55 

 54 

 58 

 52 

 59 

 58 

 57 

 57 

 52 



O <S 



Mo 



O 



mm. 

 31 

 30 

 34 

 34 

 33 

 32 

 33 

 35 

 36 

 39 

 32 



mm. 

 28 

 27 

 30 

 29 

 31 

 29 

 31 

 31 

 31 

 31 

 28 



o ^ 



mvn. 

 44 

 42 

 47 

 47 

 47 



. 42 

 49 

 47 

 47 

 49 

 41 



Table II. — Typical H. leucocephalus /rom the United States. 



