94 OPHIDIA. 
12. Geophis psephota. 
Catostoma psephotum, Cope, Journ. Ac. N. Sc. Phil. viii. p. 146 (1876). 
Hab. Costa Rica (Gadd). 
Anterior frontals present, four-sided ; supraocular present; two postoculars; upper 
labials six, the third and fourth entering the eye, the sixth the longest. Temporals 
14242. The first pair of lower labials form a suture together. Nasal undivided. 
Scales keeled, in seventeen rows. Ventrals 162; anal entire. Upper parts uniform 
black: below black, with the half or less of an occasional ventral shield red, forming a 
tessellated pattern. 
I have not seen a specimen of this species. 
13. Geophis zebrina. 
Rabdosoma zebrinum, Jan, Arch. per la Zool. ii..p. 15 (1862) ; Bocourt, Miss. Se. Mex., Rept. p. 539, 
t. 34. figg. 1, 1 a—-e. 
Rhegnops zebrinus, Cope, Proc. Am, Phil. Soc. xxii. p. 178 (1885). 
Hab. Mexico, Tehuantepec (Bocourt). 
A supraocular and two postoculars. Two pairs of frontal shields, of which the 
anterior pair are very small. Seven upper labials, the third and fourth entering the 
orbit. Temporals 1+2, the anterior in contact with the postoculars. ‘The first pair 
of lower labials in contact with each other; one pair of chin-shields. Scales smooth, 
in seventeen series. Ventral scutes 147-160. Upper parts light coloured, with about 
forty irregular brown transverse spots. Lower parts punctulated with reddish. 
ADELPHICUS. 
Adelphicos, Jan, Arch. per la Zool. ii. p. 18 (1862). 
1. Adelphicus quadrivirgatus. 
Adelphicos quadrivirgatum, Jan, Arch. per la Zool. 1862, p.19; and Iconogr. Ophid. xi. t. 8. fig. 5 ; 
Bocourt, Miss. Se. Mex., Rept. p. 554, t. 82. figg. 11, 11 a-e, 12, 12 a-e. 
Adelphicus quadrivirgatus, F. Miller, Katal. Herpet. Samml. Basl. Mus. 1880, p. 26. 
Rhegnops visoninus, Cope, Proc. Ac. N. Se. Phil. 1866, p. 128. 
Rhegnops sargit, Fisch. Jahrb. Hamb. Wiss. Anst. ii. p. 92 (1885). 
Hab. Mexico (Sallé), Jicaltepec in Vera Cruz (Miss. Geogr. Mex.) ; British Honpuras, 
Belize (Cope); GuaTeMaLa (Sarg), Alta Vera Paz (Bocourt); Honpuras (Dyson). 
Head not distinct from neck, more or less pointed ; body of moderate length; tail 
short. Eye small, with round pupil. Anterior frontals very small; supraocular well 
developed; two postoculars; seven upper labials, the third and fourth entering the 
orbit; temporals 1+1, the anterior in contact with the oculars. The first pair of 
lower labials meet in the median line, but are linear, nearly suppressed by the enor- 
