NATURAL SCIENCES OP PHILADELPHIA. 337 Bromus setaceusisi?. sterilis, L. ; probably introduced. Uniola (Brizopyrum) flexuosais Brizopyrum spicatum, Hook, and Arn. Elymus in terruptus. We cannot quite match this among the various puzzling forms of the genus from Texas. Elymus triticoide s another name furtively appropriated from Nuttall 13 a depauperate form of No. 2072, Hartweg, (and nearly of 2072, Wright), named by Col. Munro E. dasystachys, Trin., var. E. condensatus, Presl. Elymus gl a u c u s also Nuttall's appears scarcely, if at all, distinct from E. Sibiricus, L. Trisetum glabrum is Aira danthonioides, Trin., the same as Hartweg's 2027 ; new to Texas. Trisetum interrupt um is T. elonyatum, H.B.K. ; it is in Lindheimers and in one of Wright's earlier collections. Trisetum canescens is the more hairy-leaved and striate form of T. cer-nuum, Trin., described from the specimen of " T. datum" Nutt., which name Mr. Buckley has erased from the ticket, for no obvious reason (as the name is a good one), except to give some variety in form to his depredations. Hierochloa occidentali s, Nuttall's name appropriated as usual is H. borealis, Rosm. & Schult. Happily Mr. Buckley has spared the Panice.cz and the Andropoginece; for which, in the interest of all American botanists, I tender him my sincere thanks. Notes upon some REPTILES of the Old World. BY E. D. COPE. Atheris squamatus Cope. Toxicoa squamata Cope, Proc. Acad. Nat. Sci. Phila., 1859, p. 341. Eckis squamatus Hallow. Professor Jan states* that Schlegel's Vipera chlorocehis (Toxicoa, Cope, 1. c.) possesses keeled gular scales as in Tropidolamus. I find that Echis squamata of Hallowell exhibits the same peculiarity. In this respect these species differ from Echis arenicola Gray ; moreover, they are tree-vipers, having a compressed body, angular gastrosteges and prehensile tails, just as in the American tree-moccasins, species of Thamnocenchris, Salvin, and Teleuras-pisf Cope. They further represent these genera in having uniserial uros-teges. The keeled gular scales are found in Tropidolsemus, another Crotalid genus whose species abound in Malaysia ; and Megsera, also one of the Cro-talidse, is an evident representative in the forests of Ceylon. A very different type among the Solenoglypha ( Viperidos Cope) is the family Atractaspididae (-twee Cope.) Atractaspis and Brachycranium appear to be well defined genera. Whether Polemon Jan belongs here, and how it differs from Atractaspis, has not been stated. The Elaps irregularis Reinhardt, placed by Jan in that genus, and identified by Giinther with the A. i n o r n a t u s, is evi-dently the type of an unnamed genus. It differs from the other genera in its biserial urosteges. From Homeroselaps Jan, {Pacilojihis Grth., preoccupied among Apodes), it differs externally in the two nasal shields. It may be called Eurystephus. ~~ Rev. Mag. Zoo)., 1859, No. 12. t Mr. Falvin speaks of Teleuraspis (P. Z. S., 1860, 459), as being cylindrical in form. However this may be with ihe T. n i t idus, the T. sch lege Ii i lias a prehensile tail, and is much compressed. 1862.] 23
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