HYPSIGLENA.—TROPIDODIPSAS. 139 
4, Hypsiglena ornata. 
Comastes ornatus, Bocourt, Bull. Soc. Philom. 1884, p. 141. 
Hypsiglena ornata, Cope, Bull. U.S. Nat. Mus. no. 82, p. 78. 
Hab. Panama, Isthmus of Darien. 
PETALOGNATHUS. 
Petalognathus, Dum. & Bibr. Erpét. vii. p. 463 (1854). 
1. Petalognathus nebulatus. 
Coluber nebulatus, Li. Syst. Nat. i. p. 383. 
Dipsas nebulata, Schleg. Ess, ii. p. 275, t. 11. figs. 14, 15. 
Petalognathus nebulatus, Dum. & Bibr. Erpét. vii. p. 464. 
Leptognathus nebulatus, Ginth. Cat. Col. Sn. p. 177; Jan, Iconogr. Ophid. xxxvii. t. 5. fig. 3; 
Cope, Bull. U. 8. Nat. Mus. no. 32, p. 66. 
Hab. Mexico, Mexico city (Doorman), Vera Cruz (Commiss. Geogr.), 'Teapa (H. H. 
Smith); GuareMaua, Coban (Sarg); Nicaragua (Smiths. Inst.) ; Costa Rica (Gadd). 
—Sovuto America, Guiana, Venezuela, Western Ecuador. 
TROPIDODIPSAS. 
Tropidodipsas, Giinth. Cat. Col. Sn. p. 180 (1858). 
1. Tropidodipsas fasciata. (Tab. L. fig. B.) 
Tropidodipsas fasciata (part.), Giinth. Cat. Col. Sn. p. 181. 
Leptognathus fasciata, Cope, Proc. Ac. N. Sc. Phil. 1868, p. 109; Bull. U. S. Nat. Mus. no. 82, 
p- 67. 
Leptognathus (Tropidodipsas) subannulatus, Mill. Verh. naturf. Ges. Basel, viii. p. 274, t. 1. fig. 5 
(1887). 
Hab. Mexico, Jicaltepec, Vera Cruz (Cope). 
The specimens which I described in 1858 under the above name have been referred 
by later authors to different species; one of these, 7’. philippit, must be admitted to be 
distinct, having fifteen, instead of seventeen series of scales. Much less certain is the 
specific distinctness of 7. dwmerilit and its synonyms. 
The specimens which I retain under the original name of T. fasciata have seventeen 
rows of scales, a longer snout, larger eye, loreal distinct from the two preoculars, and, 
especially, a pair of posterior chin-shields, which are nearly as long as the anterior. 
The latter character is the most important, and offers the evidence that L. dumerilit of 
Jan is identical with 7. sartorii and not with T. fasciata. 
According to Cope, this snake inhabits the “tierra caliente.” Our figure is taken 
from the type in the British Museum (spec. a). 
*18 2 
