15 



REPTlLlA: SERPENTES: COLUBRIDAE 



• * 



ADELPHICOS 



ADELPHICQS Jan 



1862 Adelph icos Jan, Arch. Zool. Anat. Fis., 2; 18. Type-species: Adelph icos quadr i v irqatum Jan. 

 1866 Rheqnops Cope, Proc. Acad. Nat. Sc i . Phila., 1866: 128. Type-species: Rheqnops v ison i nus Cope. 



Distribution: Atlantic slopes from central Honduras through British Honduras (apparently not in 

 Yucatan) to central Veracruz; on Pacific slopes from central Guatemala to central Oaxaca; interior 

 valleys of Guatemala and Chiapas. 



Content: Two species. 



Key to the species 



1. Third infralabial nearly as broad as long, sub- 

 equal in size to second; chinshields not 



greatly expanded toward lip (Fig, l) 



veraepac i s 



Third infralabial absent, or greatly reduced in 

 size and confined to labial border; chin- 

 shields greatly expanded toward lip (Figs. 

 2-3/ quadr i v irga tus 



Clave de especies 



Tercera infralabial aprox imadamente tan ancha 

 como larga, de tamano subigual a la segunda; 

 escudos mentales no expandidos notablemente 

 hacia el borde labial (Fig. l) veraepac i s 



Tercera infralabial ausente o muy reducida en 

 tamano y confinada al borde labial; escudos 

 mentales muy expandidos hacia el borde labial 

 (Figs. 2-3) quadr i v i rqatus 



(Fig. l) (Fig. 2) (Fig. 3) 



Figs. 1-3- Arrangement of scales on chin of Adelph icos (adapted from Smith, 15^2) 



ADELPHICOS QUADRIVIRGATUS Jan 



1862 Adelph icos quadr i v i rga turn Jan, Arch. Zool. Anat.'Fis., 2: 18, pi. i 

 Distribution: Chiapas, Mexico through British Honduras to Guatemala. 

 Content: Three subspecies, one ( quadr i v i rqatus Jan) ex tral im i tal. 



Type-locality: "Mexico". 



Key to the subspecies 



1. Third infralabial absent; chinshields bor- 

 dering lip (Fig. 2); belly not or slightly 



p i gmented sarg i i 



Very narrow third infralabial separates 

 chinshield from lip (Fig. 3); belly fre- 

 quently heavily pigmented v i son i nus 



Adelphicos quadr i v i rga tus sarg i i (F i scher) 



Clave de subespecies 



1. Tercera infralabial ausente; escudos men- 

 tales formando el labio (Fig. 2); vientre 

 sin con muy poca pigmentacion (Fig. 2)-- 



sarg i i 



Una tercera infralabial muy angosta separa 

 los escudos mentales del labio (Fig. 3); 



vientre f recuentement muy pigmentado 



V i son i nus 



188S Rheqnops sarg i i Fischer. Jahrb. Hamb. Wiss. Anst., 2: 52. Type-locality: Guatemala. 



1887 Adelphicos sarqii — Cope. Bull. U.S. Nat. Mus., 32: 85. 



1-9^2 Adelph icos quadr i virgatus sarg i i — Smith, Proc. Rochester Acad. Sci., 8: I52. 



Distribution: Foothills on Pacific slopes from southern Chiapas to central Guatemala. 



