16 



to the size of the birds, and not according to locality, the wing 

 being taken as the standard of measnrcment : — 



Total 



length. Culm. Wing. Tail. Tarsus, 



in. in. in. in. in. 



l.Ad. Thibet (7/w/r/,ww) 24-0 3-35 19-(3 11-2 2-8 



2. Ad. Mexico (type of e.woMis) 25-0 3-45 18-9 lO-S 2-9 



3. 2 a<i- Onon I'^'er (Di/bowski) .... 2'9 18-45 10-5 2-5 



4. Ad. Ladakh (Strac/m/) 25-0 3-3 17-9 11-0 275 



5. $ ad. Jerusalem (rm/;r«m).... 24-5 3-2 177 9-8 27 

 0. $ ad. England 23-5 3-3 177 10-0 2-9 



7. d ad. Sardinia (J?/-ooA:e) 25-0 3-15 17'6 100 2'9 



8. Ad. Vancouver's Island (Lord) 24-0 3-45 17-5 10-2 2-85 



9. Ad. Mexico .22-5 295 17-45 100 28 



10. Ad. England 240 3-25 17-3 10-2 27 



11. Ad. Fort Simpson (Hoss) .... 220 2-95 17-1 9-8 2-G5 



12. cJ ad. S. Spain (Irbi/) 23-5 2-95 lG-9 9-8 2-8 



13. d" ad. Fort Simpson' (J?o.<t5) . . . . 24'0 2-95 16-8 9-5 2'6 



14. Ad. Switzerland 25-0 3-0 16-6 10-0 2-8 



lo. 2 ad. W. side Rocky Mts.(Z:orrf) 23 285 16-6 10-1 2-5 



10. 2 ad. SkSne (Meves) 21-0 3-2 16'5 9-6 2-05 



17. djuv. SkFrne (Meves) 23-0 3-05 16-5 9-8 285 



18. Ad. Mexico 24-0 2-95 16-5 10-0 2-55 



19. Ad. England 24-0 3-15 16-5 100 2-95 



20. Ad. 49th parallel (Dmraow) 23-0 3-05 16-.35 10-0 2-5 



21. Ad. 4nthparallel(Z)aii'sort).... 23'0 2^5 15-95 10-0 2-6 



After a carefiil perusal of the large series at my disposal in the 

 Museum, I find myself entirely of the same opinion as Mr. Dresser, 

 viz. that there is only one species of large Haven, and that C. thibe- 

 tamts, C. nohUis, (S:c. must be considered synonymous with C. corax. 

 The differences given by the authors of the great work on North- 

 American birds for the separation of the American Raven do not 

 hold good in the set of skins now before me ; and so various is the 

 size of bill, even in individuals from the same locality, that any 

 separation on account of this would prove quite untenable. The 

 dimensions given above show how these vary in the Museum series. 



II((h. The whole of Europe, Northern and Central Asia, North 

 America, ranging into Mexico. 



a,b. ^ 2 ^d. St. England. Purchased. 



c. Juu. St. England. Purchased. 



d. Ad. St. Cambridgeshire. Mr. J. Baker [C.]. 



e. Ad. St. Devonshire. Col. Montagu [P.]. 

 /. Ad. .sk. Devonshire. Col. Montagu [P.]. 



'/• 2 ad. sk. Skane, Sweden, Nov. 18, Purchased. 



1873. 

 h. cJ juv. sk. Skane, Sweden, Mai-ch 9, Purchased. 



1874. 

 ('. Ad. sk. Switzerland. Purcliased. 



/.-. S ad. sk. Villacidio, Sardinia, May 22, A. B. Brooke, Esq. [C.]. 



1871. 

 /. S ad. .sk. Near Casa Vieja, South Lieut.-Col. Irby [P.]. 



Spain, May 1874. 

 m. 2 ad. sk. .lerusalem. Canon Tristram [C.]. 



