290 COLUBRID. 
(Se. 19; V. 198; St Louis, Missouri. Dr. 8. Garman [P.}. 
2 Se 19; V. 138; St. Louis, Missouri. © A, Erwin Brown, 
C, 36). Esq. [P.]. 
19. AMPHIARDIS. 
Amphiardis, Cope, Proc, U.S. Nat. Mus. xi. 1888, p. 391, and xiv. 
1891, p. 675. 
Teeth equal. Head saad not distinct from neck; eye small, 
with round pupil; no preocular; loreal and prefrontal entering 
the eye. Body cylindrical; scales keeled, in 17 rows; ventrals 
rounded. ‘Tail short; subcaudals in two rows. Hypapophyses . 
developed throughout the vertebral column. 
Texas. 
This genus appears to be intermediate between Ischnognathus and 
Haldea, agreeing with the former in having two internasals, with 
the latter in the absence of preeocular. 
1. Amphiardis inornatus. 
Virginia inornata, Garman, N. Am. Rept. p. 97 (1883). 
‘Amphiardis inornatus, Cope, ll. ec. 
Head subconical; snout short, blunt. Rostral very small, not 
reaching the top of the head; loreal elongate; one postocular ; 
temporals 141; five upper labials, third and fourth entering the . 
eye; posterior ‘chin-shields half as long as the anterior. Scales 
keeled, lustrous, in 17 rows, outer row faintly keeled. Ventrals 
125-129 ; anal divided; subcaudals 36. Uniform brownish olive 
above, whitish beneath. 
Total length 260 millim. ; tail 45. 
Near Dallas, Texas. 
20. HALDEA. 
Calamaria, part., Schleg. Phys. . ii. p. 25 (1837). 
Conocephalus (non Thumb.), Dum. §& Bibr. Mém. Ac. Se. xxiii. 
1853, p. 442, and Erp. Gén. vi. . 138 (1854) ; Giinth. Cat. Col. 
Sn. p. 17 (1858) ; Jan, Arch. Zool, Anat. Phys. ii. 1862; p, 24; 
Bocourt, Miss. So. Mex., Rept. p. 541 (1883). 
Haldea, Baird § Gir. Cat. N. foes "Rept. p. 122 (1853). 
Falconeria, T’heob. Cat. Ena 6 As. Soc, Mus. p. 44 (1868). 
Potamophis, Garman, Bull. Essex Inst. xxiv. 1892, p. 105. 
Maxillary teeth very small, subequal, 16 to 18; anterior mandi- 
bular teeth a little larger than the posterior, Head small, not 
distinct from neck; eye small, with round pupil; a single inter- 
nasal; no preocular, loreal and’ prefrontal entering the eye. Body 
cy ‘lindrical ; scales keeled, without apical pits, in 17 rows ; yentrals 
rounded. Tail short ; ; subcaudals in two rows. Hypapophyses 
developed throughout the vertebral column. 
North America. 
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