SOUTH AMERICAN SNAKES AMAKAL 



25 



I believe that these figures are so definite because Boulenger had 

 at his disposal only 23 specimens, which, of course, constitute a rela- 

 tively small series. I, myself, having studied 13 specimens in the 

 United States National Museum, was afterwards able to examine 

 and compare 31 specimens in the Museum of Comparative Zoology 

 and the large collection of the Instituto do Butantan, which I received 

 in the meantime. The latter collection consisted of 58 specimens, 

 thus making a total of 102 specimens. As a result I have ascertained 

 that as a rule the female specimens have a larger number of ventrals, 

 due to the fact that they have a larger number of dorsal vertebrae 

 tlian the males, and that at the same time they usually have a larger 

 number of annuli. This condition is particularly evident in large 

 series of specimens, as, for instance, in that from Sao Paulo, Brazil, 

 which is tabulated below. 



The 102 specimens examined were as follows: 



Museum 



U. S.N.M.... 



Do 



Do 



Do 



Do 



Do.-. 



Do 



Do 



Do 



Do... 



Do 



Do 



Do. 



M.C.Z 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do... 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do... 



Do 



Do 



Do 



Do... 



Do 



Do 



Do 



Do 



Do 



Do 



Do.. 



Do 



Do 



Inst. Butantan 



Do 



Do 



Do 



Do 



Do 



No. 



1405 



5444 



6006 



13823 



39074 



5585-1 



5585-2 



5585-3 



7342 



15234 



17740 



55959 



60652 



6122 



6755 



945-1 



945-2 



5066 



9978 



12428 



9885 



1208 



3216 



1459 



3663-1 



36G3-2 



1190-1 



1190-2 



1357 



1375 



3298 



16433 



1192-1 



1192-2 



16683 



2580 



2612 



2955-1 



2955-2 



2976 



17762 



17761 



17851 



17852 



1308 



1593 



937 



1528 



1544 



1728 



Locality 



So. America 



Brazil 



Brazil (Amazonas)... 



Dutch Guiana 



Brazil (S. Paulo) 



Trinidad 



do. 



do 



do 



do 



do.. 



do 



do- 



do.. 



do 



So. America... 



do 



do... 



Venezuela 



Peru 



Brazil (Amazonas) 



Brazil (Para) 



Brazil (Pcrnambuco). 



do 



Brazil (Bahia) 



do 



do.. 



do 



do. 



Brazil (Rio) 



Brazil (Esp. Santo).. 

 Brazil (Rio) 



do _ 



do 



Brazil (S. Paulo) 



Brazil (Para) -. 



do 



Brazil (Bahia) 



do.. 



Brazil (Amazonas) 



Brazil (Minas) 



do... 



Brazil (Bahia) _. 



Brazil (Minas) _ 



Brazil (S. Paulo) 



do -. 



do.. -.-. 



do 



do. 



Sex 



Brazil (Amazonas) 1 9 



235 

 267 

 249 

 237 

 234 

 230 

 220 

 214 

 241 

 225 

 220 

 230 

 221 

 220 

 222 

 234+4 

 234-l-i 

 213 

 208 

 246 

 235 

 221 

 236 

 226 

 241 

 224 

 226 

 207 

 220-1- i 

 233-1-1 

 231 

 233 

 214 

 227 

 235 

 224 

 22H-J 

 232 

 227 

 218 

 232 

 258 

 224 

 235 

 241 

 240 

 225 

 226 

 230 

 246+i 



C. 



25p.-l-.. 



37 p 



39p 



38 p 



30p 



33 p 



35p.+2. 

 32 p. -1-3. 

 27P.-1-7. 



34 p. +3. 



30 p. 4-8. 



26 p 



27p.-|-5. 

 30p 



34 p.+2. 



40p 



36p.-|-2. 

 24p.+3. 



29p 



36 p 



42p 



35 p 



22p.-l-2. 



27 p 



41 p 



24p 



24 p 



17p.+5. 

 22-p.-t-2. 



26 p 



5 p. -1-18. 



25 p 



18 p. -1-13- . 



23p 



33p.-t-l. 



36p 



12p.-l-12 

 26p.-t-l. 



25 p 



13p.+8. 



36p 



28p 



25 p 



27p.+3_ 



30p 



35 p 



32p 



31 p 



27p.-|-2. 

 41 p 



Triads of annuli 



Body Tail 



1+ 



