308 



REPTILIA: SERPENTES: COLUBRIDAE 



IRIMETOPON 



TRIMETOPON Cope 



1885 Tr imetopon Cope, Proc. Amer. Phil. Soc. , 22: 177- Type-species: Ablabes qrac ills Gunther. 

 Distribution: Guatemala to Panama. 

 Content: Ten species. 



Key to the species 



1. Prefrontals fused 2 



Prefrontals separate, paired i 



2. Dorsal scales in 15 rows- 

 Dorsal scales in I7 rows- 



- pl i olep i s 



3. Two postoculars; ventrals fewer than 130- s im i le 

 One postocular; ventrals more than l'^5-- qrac ile 



4. Dorsal scales in I7 rows- 

 Dorsal scales in I5 rows- 



5. Seven upper labials- 

 Eight upper labials- 



5 



- harbour i 

 6 



6. Two postoculars; fewer than 80 subcaudals ] 



One postocular; more than 80 subcaudals 



Posadas i 



7. Fewer than 40 subcaudals- 

 More than 45 subcaudals-- 



- V I quez I 

 -slevini 



Clave de especies 



1. Prefrontales fusionados 2 



Prefrontales separados, en pares 4 



2. Escamas dorsales en I5 hileras- 

 Escamas dorsales en I7 hileras- 



- pl i olep i s 



3. Oos postoculares; menos de I3O ven trales- s i m i le 

 Un postocular; mas de 135 ventrales qrac ile 



4. Escamas dorsales en I7 hileras- 

 Escamas dorsales en I5 hileras- 



-barbour i 



5. Siete labiales superiores- 

 Ocho labiales superiores-- 



6. Dos postoculares; menos de 80 subcaudales 7 



Un postocular; mas de 80 subcaudales 



Posadas i 



7. Menos de 40 subcaudales- 

 Mas de 45 subcaudales 



- V I quez I 

 -slevini 



8. One postocular-- 

 Two postoculars- 



veraepac 1 s 



3. More than I6O ventrals p i lonaorum 



Fewer than 160 ventrals hannste i n i 



8. Un postocular 



Dos postoculares- 



- veraepac 1 s 



9. Mas de 160 ventrales p i lonaorum 



Menos de 160 ventrales hannste i n I 



TRIMETOPON BARBOUR! Dunn 



1930 Tr imetopon harbour i Dunn, Occ. Pap. Boston Soc. Nat. Hist., 'j: 331* Type-locality: Pedro 

 Miguel, Canal Zone, Panama. 



Distribution: Known from Ancon and Barro Colorado Island, Canal Zone, Panama, as well as from 

 type locality. 



TRIMETOPON GRACILE (Gijnther) 



1872 Ablabes gracilis Gunther. Ann. Mag. Nat. Hist., (4) 3: 18, pi. 3, fig. D. Type-locality: Near 



Cartago, Costa Rica. 

 1885 Tr imetopon qrac i le — Cope, Proc. Amer. Phil. Soc, 22: 177- 



Distribution: Costa Rica. 



TRIMETOPON HANNSTEINI Stuart 



19*9 Tr imetopon hannste i n i Stuart, Proc. Biol. Soc. Washington, 62; I65. Type-locality: Finca La 

 Paz, 18 km north of Coatepeque, Departamento San Marcos, Guatemala; I45O m. 



Distribution: Moderate elevations along Pacific slope of western Guatemala and Chiapas, Mexico. 



