724 INDEX. 



male spiders, 250; on tlie proportion of the sexes in spiders, 287; on 

 sexual variation of color in spiders, 307; on male spiders, 307. 



Bladder- nose Seal, hood of the, 603. 



Blaine, on the affections of dogs, 597. 



Blair, Dr. , on the relative liability of Europeans to yellow fever, 

 221. 



Blake, C. C. , on the jaw from La Naulette, 46. 



Blakiston, Capt., on the American snipe, 428; on the dances of 

 Tetrao phasianellus, 431. 



Blasius, Dr., on the species of European birds, 480. 



Bledius taurus, hornlike processes of male, 338. 



Bleeding, tendency to profuse, 268. 



Blenkiron, Mr., on sexual preference in horses, 598. 



Blennies, crest developed on the head of male, during the breeding 

 season, 385. 



Blethisa multipunctata, stridulation of, 343. 



Bloch, on the proportions of the sexes in fishes, 281. 



Blood, arterial, red color of, 296; pheasant, number of spurs in, 

 413. 



Blow-fly, sounds made by, 318. 



Bluebreast, red-throated, sexual differences of the, 537. 



Blumenbach, on Man, 32; on the large size of the nasal cavities in 

 American aborigines, 38; on the position of man, 170; on the number 

 of species of man, 199. 



Blyth, E., on the structure of the hand in the species of Ilyldbates, 

 57; observations on Indian crows, 116; on the development of the 

 horns in the Koodoo and Eland antelopes, 265; on the pugnacity of 

 the males of Oallicrex cristatua, 409; on the presence of spurs in the 

 female Euplocamus erythrophthalmus, 413; on the pugnacity of the 

 amadavat, 415; on the spoonbill, 425; on the moulting of Anthus, 

 444; on the moulting of bustards, plovers, and Gallus bankiva, 445; 

 on the Indian honey-buzzard, 481 ; on sexual differences in the 

 the color of the eyes of hornbills, 483; on Oriolus melanocephalus, 

 524; on Paloeornis javanicus, 525; on the genus Ardetta, 524; on the 

 peregrine falcon, 525; on young female birds acquiring male charac- 

 ters, 524; on the immature plumage of birds, 529; on representative 

 species of birds, 533; on the young of Turnia', 543; on anomalous 

 young of Lanius rnfus and Colymhus glacialis, 550; on the sexes 

 and young of the sparrows, 550; on dimorphism in some herons, 552; 

 on the ascertainment of the sex of nestling bullfinches by pulling 

 out breast feathers, 551; on orioles breeding in immature plumage, 

 552; on the sexes and young of Buphus and Anastomus, 553; on the 

 young of the blackcap and l)lackbird, 554, 555; on the young of the 

 stonechat, 555; on the white plumage of Anastomus, 561; on the 

 horns of Bovine animals, 575; on the horns of Antilope bezoartica, 

 575, 577; on the mode of fighting of Ovis ci/cloceros, 579; on the voice 

 of the Gibbons, 602; on the crest of the male wild goat, 606; on the 

 colors of PoTtax picta, 611; on the colors of Antilope bezoartica, 612; 

 on the color of the Axis deer, 613; on sexual difference of color in 

 Hylobates hoolock, 613 ; on the hog-deer, 624 ; on the beard and 

 whiskers in a monkey becoming white with age, 637. 



Boar, wild, polygamous in India, 246; use of the tusks by the, 

 585; fighting of, 591. 



