144 SYSTEMATIC LIST AND SYNONYMY, 



O P H I D I A— Continued. 



(Tketanorhinus.) 



Helicops variabilis 33 



Tretanorhinus variabilis D. A ft, 1854, Erp. Gen., VII, 349; Jan, 1863, 

 Sist., 76. Helicops agassizii Jan, 1863, Sist, 70, — 1S68, Icon., livr. 28, 

 pi. 2, f. 1. Tretanorhinus variabilis var. adnexus Jan, 1863, Sist., 76. 



Nicaragua to Mexico. 



Helicops nigroluteus 



Tretanorhinus nigroluteus Cope, 1861, l'r. Ac. Phil., 298. 



Head narrow, slightly distinct Rostral broader than high, sepa- 

 rated from internasals by the nasals. Nasal in two parts, nostril 

 between. Prefrontals as long as frontal. Anterior border of frontal 

 equal to lateral. Loreals two, anterior smaller. Oculars 2— 2. La- 

 bials 8, fourth in orbit. Infralabials 10. Scales keeled, in 21 rows. 

 Ventrals 136. Anal bifid. Black above; yellow beneath; punctu- 

 lated anteriorly, punetulations forming bands near the Hank. 



Central America. 



Helicops allenii 34 



Garman, 1874, Pr. Post. Sue., 92; Cope, 1875, Checklist, 43. 



Florida. 



Hydrops ' 34 



Wagler, 18:30, Amph., 170; Gray, 1842, Zool. Misc., 07; Fitz., 1843, 

 Syst., 25; Gray, 1849, Cat Serp., 75. 



Hydrops erythrogrammus 35 



Coluber erythrogrammus Latr., 1802, Kept., IV, 141; Daud., 1803, Rept, 

 VII, 03, pi. 83, f. 2; Ilarl., 1827, .Tour. Phil. Ac., 301 ; llolbr., 1830, 

 Herp., I, 115, pi. 22. Abastor erythrogrammus B. & G., 1853, Serp., 

 125; Bd., 1859, P. R. R. Rep-. X, I 1 '- 33, f- 93; Gray, 1849, Serp., 78; 

 Gthr., 1858, Cat., 275. Caloptema erythrogrammus I>- & B., 1854, Erp., 

 VII, 336; Mart., 1850, Mas. Berl., 27; Jan, 1863, Sist, 75, — 180S, 

 Icon., livr. 20, pi. 4, f. 2, pi. 5, f. 1. Homalopsis erythrogrammus Boie, 

 1827, Isis, 551. Helicops eryfftrogramMwi Waul., 1830, Amph., 170; 

 Holbr., 1842, Herp., Ill, 107, pi. 25. Homalopsis pKcatUis var. Schleg., 

 1837, Essai, 173, II, 353. Ntdrix erythrogrammus .Men-., 1820, Amph., 

 117. 



Illinois and Virginia southward. 



Hydrops abacurus 36 



Coluber abacurus Holbr., L836, Herp., I, 119, pi. 23. Hydrops abacurus 



D. & B., 1854, Erp., Atlas, pi. 65. Calopwna abacurum D. & B., 1854, 

 Erp., VI r. 342 ; Mart., 1856, Mus. Berl., 27. II Keeps abacurus Holbr., 

 18 12. I [erp., Ill, pi. 20. Hydrops n mwardtii Gray, 1842, Zool. Misc., 

 c>7. Homalopsis reinwardtii Schleg., 1837, Kssai, I, 173, II, 357. 

 Farancia fasdaia Gray, 1S49, Cat., 74; Gthr., 1858, Cat, 275. Faran- 

 cia drummondi Gray, 1842, Zool. Misc., 68. Farancia abacurus B. & 

 G., 1853, Serp., 123; Bd., 1859, P. P. R. Rep., X, pi. 33, f. 02. Calo- 

 pisma reinwardtii Jan, 1803, Sist., 75, — 1868, Icon., livr. 20, pi. 0, f. 

 1-2. 



The Carolinas to Texas, 



