30 BULLETIN 18 7, UNITED STATES NATIONAL MUSEUM 



Genotype. — Adelphicos quadrivirgatuTn Jan. 



Ram,ge. — ^Atlantic slopes from central Veracruz to central Hon- 

 duras, and Pacific slopes from central Guatemala to central Oaxaca; 

 also the interior valleys of Guatemala and Chiapas. - 



Species. — Five subspecies are included in two species; the single 

 extralimital race is A. v. veraepacis Stuart from the mountains of 

 central Guatemala. 



KEY TO FORMS OF ADELPHICOS 



1. Third infralabial nearly as broad as long, subequal in size to second ; chin 



shields not greatly expanded toward lip 2 



Third infralabial absent, or greatly reduced in size and confined to labial 

 border ; chin shields greatly expanded toward lip 3 



2. Ventrals 124 to 130 in males, 136 to 142 in females ; caudals 40 to 42 in males, 



27 to 30 in females ; maximum length 392 mm. (females ; males 358 mm. ) ; 

 chin distinctly dark spotted ; all of anterior edges of ventrals dark ; sub- 

 caudal surface generally suffused with black veraepacis veraepacis 



Ventrals 121 to 129 in males, 128 to 135 in females ; caudals 31 to 37 in 

 males, 22 to 27 in females ; maximum length 318 mm. (females ; in males 

 243 mm.) ; chin nearly or quite immaculate or with median dark spots 

 that do not extend along all of anterior margins of ventrals ; a median 

 subcaudal tail stripe veraepacis nigrilatus 



3. Chin shields separated from lip by a very narrow third labial ; caudals 43 to 



49 in males, 36 to 45 in females; belly frequently heavily pigmented; 

 subcaudal surface frequently suffused with black. 



quadriviigatus visoninus 

 Chin shields bordering lip, third infralabial absent ; belly not or little 

 pigmented 4 



4. Caudals 29 to 35 in males, 24 to 29 in females; ground color vei'y dark, 



lines scarcely visible; never any pigment on chin or belly; subcaudal 



surface profusely pigmented quadrivirgatus sargii 



Caudals 44 to 49 in males, 32 to 36 in females ; lines on sides and back 

 distinct; belly sometimes with some pigment; a median subcaudal 

 stripe quadrivirg-atus quadrivirgatus 



ADELPHICOS QUADRIVIRGATUS QUADRIVIRGATUS Jan 



Adelphicos quadrivirgatum Jan, Arch. Zool. Anat. Fis., vol. 2, 1862, pp. 18-19, pi. 8. 



Adelphicos quadrivirgafus quadrivirgatus SMrrn, Proc. Rochester Acad. Sci., 

 vol. 8, 1942, pp. 188-192, figs. 3 (ventral head scales), 6 (map). 



Adelphicos quadrivirgatus acutirostrum Eocouet, Mission scientifique au Mexique 

 et dans I'Amerique centrale, Rept., livr. 9, 1883, p. 555, pi. 32, fig. 12 (h ad 

 scales) (type locality, Mexico; type in Mus. Hist. Nat. Paris). 



Type.— Milan Mus. 



Type locality. — ^Mexico, 



Range. — Foothills, on the Atlantic coast from central Veracruz to 

 British Honduras, avoiding the northern part of the peninsula of 

 Yucatan ; on the Pacific coast from central Oaxaca to at least northern 

 Chiapas (known from four localities: Jicaltepec, Veracniz; Pochutla, 

 Oaxaca; Ocozocoautla, Chiapas; Silkgrass Creek, British Honduras). 



