66 BULLETIN 18 7, UNITED STATES NATIONAL MUSEUM 



Jet black above; usually a light nuchal collar at least indicated; belly 

 black, with light, quadrangular spots ; ventral surface of head and neck 

 black, except at light ring ; caudals 24 to 29 in females mutitorques 



8. Scales in 17 rows 9 



Scales in 15 rows 17 



9. No supraoculars ; no postocular ; ventrals 124 auocularis 



Supraoculars present 10 



10. Length of portion of rostral visible from above two-thirds its distance 



from frontal 11 



Length of portion of rostral visible from above half or less than half its 

 distance from frontal 12 



11. First infralabial in contact with its mate medially dubius 



Mental in contact with chin shields rostralis 



12. No internasals ; reddish with black dorsal cross bands cancellatus 



Internasals present ; no dorsal cross bands 13 



13. Scales keeled posteriorly 14 



Scales smooth on entire body 15 



14. Scales of posterior chin shields in contact medially; scales on proximal 



half of tail keeled ; length of portion of rostral visible from above 



equal to, or greater than its distance from prefrontal nasalis 



Scales of posterior chin shields separated medially; all dorsal caudal 

 scales smooth ; length of portion of rostral visible from above about 

 half its distance from prefrontal sieboldi 



15. Diameter of eye equal to, or less than, its distance from labial border; 



three labials in contact with anterior chin shields ; belly checkered. 



blanchardi 

 Diameter of eye greater than its distance from labial border ; four labials 

 in contact with anterior chin shields; belly light, sometimes black- 

 spotted, tail with ventral black marks in some 16 



16. Two postoculars; belly spotted, subcaudals with their anterior portions 



black bicolor 



One postocular ; belly and tail light, unspotted chalybeus 



17. Diameter of eye greater than its distance from labial border chalybeus " 



Diameter of eye less than its distance from labial border 18 



18. Tail and body distinctly banded ; five supralabials semidoliatus 



Tail not banded, anterior part of body sometimes banded ; six supralabials. 19 



19. Length of portion of rostral visible from above two-thirds its distance 



from frontal petersii 



Length of portion of rostral visible from above half or less than half its 

 distance from frontal 20 



20. Scales faintly keeled ; no bands ; ventrals 129 to 133 sallaei 



Scales smooth ; bands present on anterior part of body, sometimes faint ; 



ventrals 150 to 164 dugesii 



GEOPHIS ANOCULARIS Dunn 



Oeophis anocularis Dunn, Proc. Biol. Soc. Washington, vol. 33, 1920, p. 127. 



TT/pe.—V.S.'NM. No. 46556. 



Type locality. — Totontepec, Oaxaca. 



Range. — I^own only from the type locality. 



^ One of the three cotypes of guttulatum ( = chaly'beus) has 15 scale rows, while the other 

 two have 17. The aberrant specimen has short rows intercalated between the others on 

 various parts of the body. 



