274 



SI BON 



SI BON ANNULATA (canther) 

 annulata group 



I872 Leptoqnathus annulatus GUnther, Ann. Mag. Nat. Hist., (4) 5: 3'^- Type-locality; Near Cartago, 



Costa Rica. 

 I876 Leptoqnathus p ict i ventri s Cope, Jour. Acad. Nat. Sc i . Phila., 8 (2): I30. Type-locality: Costa 



Rica. 

 1535 SI ibon I annulata— Dunn and Bailey, Bull. Mus. Comp. Zool., Harvard, 86: 5» 

 1960 Sibon annulata — Peters, Misc. Publ. Mus. Zool. Univ. Mich., 114; 176. 



Distribution: Atlantic slopes of Costa Rica and Panama. 



SIBON ANTHRACOPS (Cope) 

 annulata group 



1868 Leptoqnathus anthracops Cope, Proc. Acad. Nat. Sci. Phila., 1868: 136. Type-locality; Central 



Amer i ca- 

 1521 S ibynoinorphus ruthveni Barbour and Dunn, Proc. Biol. Ssc. Wash., Ji: I58. Type-locality: 



Aguacate Mountains, Costa Rica. 

 1960 Sibon anthracops. — Peters, Misc. Publ. Mus. Zool. Univ. Mich., 114; 180, pi. 7c. 



Distribution; Pacific slopes of Costa Rica, Nicaragua, and Honduras. 



SIBON ARGUS (Cope) 

 arqus group 



1876 Leptoqnathus arqus Cope, Jour. Acad. Nat. Sc!. Phila., 8 (2): I3O. Type-locality; Costa Rica. 

 1960 Sibon arqus — Peters, Misc. Publ. Mus. Zool. Univ. Mich., 114; ISJ. 



Distribution: Known only from type locality. 



SIBON CARRI (Shreve) 

 nebulata group 



1551 Tropidodipsas carri Shreve, Copeia, 1551: 52. Type-locality: Escuela Agrfcola Panamer icana, 



near Tegucigalpa, Honduras. 

 1960 Sibon carri — Peters, Misc. Publ. Mus. Zool. Univ. Mich., 114: I94. 



Distribution; Pacific slopes of Honduras; El Salvador. 



SIBON DIMIDIATA (Cunther) 

 annulata group 



1872 L eptoqnathus dimidiatus Gijnther, Ann. Mag. Nat. Hist., (4) 9: 3I. Type-locality: Mexico. 

 1943 Sibon dimidiatus — Smith. Proc. U. S. Nat. Mus., 93: 47O. 



Distribution: Southern Mexico and Central America. 



Content; Two subspecies. 



Key to the subspecies Clave de subespecies 



1. Centers of dorsal blotches in adults con- 1. Centros de manchas dorsales cons iderable- 



siderably lighter than outer parts mente m^s claros que la perlferia, en 



dimidiata adult os dimidiata 



Dorsal blotches unicolor, not lighter to- Manchas dorsales unlformes sin centre 

 ward centers qrandocul is claro qrandocul is 



