Venoms; venomous animals and antivenomous serum-therapeutics . d h e f g Fig. 72.—A, Horny appendage (rattle) of (three-quarters natural size. After Garman).B, longitudinal section of the same. C, separatedsegments of the appendage: a, terminal point: /(,basal segment (after Czermak). exceeds IH or 20. THE PRINCIPAL SPECIES OF POISONOUS SNAKES 12:5. Fig. 7S. —Crotaliis terriricus (Dog-faced Eattle-Snake, Cascavella iu Brazil). (After Stejneger.) 124 VENOMS segments fall off and are at once replaced Contrary to the ])eliefwhich was long entertained, their number bears no rel


Venoms; venomous animals and antivenomous serum-therapeutics . d h e f g Fig. 72.—A, Horny appendage (rattle) of (three-quarters natural size. After Garman).B, longitudinal section of the same. C, separatedsegments of the appendage: a, terminal point: /(,basal segment (after Czermak). exceeds IH or 20. THE PRINCIPAL SPECIES OF POISONOUS SNAKES 12:5. Fig. 7S. —Crotaliis terriricus (Dog-faced Eattle-Snake, Cascavella iu Brazil). (After Stejneger.) 124 VENOMS segments fall off and are at once replaced Contrary to the ])eliefwhich was long entertained, their number bears no relation to theage of the snake. Kattle-Snakes are met with especially in stony and aridlocalities, or among brushwood near water. They hardly ever biteexcept when surprised or attacked. (1) C. terrljicus (Dog-faced Eattle-Snake, C a sea vella in Hyq^zW;fig. 73).—Snout very short; three or four series of scales betweenthe eye and the supralabial shields ; body-scales in 23—31 rows,dorsals very strongly keeled ; li)0—199 ventrals ; 18—30 sub-caudal s. Colour brown, with a series of darker, light-edged rhombs,often lighter in the centre; a dark streak from the eye to theangle of the mouth ; belly yellowish-white, uniform or spotted withbrown ; tail generally brown or blackish. Total length, 1,320 milhmetres ; tail 130. Habitat: Arizona, New Mexico, and Tex


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