290 COLTTBRID^, 



a. 2 (Sc. 19 ; V. 138 ; St. Louis, Missouri. Dr. S. Garman [P.]. 

 C. 36). 



b. 2 (Sc. 19 ; V. 138 ; St. Louis, Missouri. A. Erwin Brown, 

 C. 3G). Esq. [P.]. 



19. AMPHIARDIS. 



Ampliiardis, Cojje, Proc. U.S. Nat. Mus. xi. 1888, p. 391, aud xiv. 

 1891, p. 675. 



Teeth equal. Head small, not distinct from neck ; eye small, 

 with round j)upil ; no prseocular ; loreal and pra^frontal 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 iuternasals, with 

 the latter in the absence of prseocular. 



1. Amphiardis inornatus. 



Virginia inornata, Garman, N. Am. Rept. p. 97 (1883), 

 Amphiardis inornatus, Cope, II. cc. 



Head subcorneal ; snout short, blunt. Eostral very small, not 

 reaching the top of the head ; loreal elongate ; one postocular ; 

 temporals 1 + 1 ; 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. (><^i^^v.^U..;^ 



Calamaria, part., Schleg. Phys. Serp. ii. p. 25 (1837). 



Conocephalus (iion Thumb.), Dum. ^" Bibr. Mem. Ac. Sc. xxiii. 



1853, p. 442, and Erp. Gen. vii. p. 138 (1854) ; Gilnth. Cat. Col. 



Sn. p. 17 (1858) .; Jan, Arch. Zool. Anat. Phijs. ii. 1862, p. 24 ; 



Bocourt, Miss. Sc. Mex., Rept. p. 541 (1883). 

 Haldea, Baird ^- Gir. Cat. N. Am. Be^^t. p. 122 (1853). 

 Falcoueria, Theob. Cat. Mept. As. Soc. Mus. p. 44 (186S). 

 Eotamophis, 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 proeocular, loreal and praefrontal entering the eye. Body 

 cylindrical; scales keeled, without apical pits, in 17 rows ; ventrals 

 rounded. Tail short ; subcaudals in two rows. Hypapophyses 

 developed throughout the vertebral column. 



North America. 



