NATURAL SCIENCES OF PHILADELPHIA. 339 



No. 99. Bright green with a few dark brown rhombs on the back. On the pos- 

 terior part of the body, narrow pinkish grey bands, alternate on opposite sides 

 of the median line. The whole upper surface sparsely dotted with brown 

 punctulations. Upper surface of head with two deep brown spots on the 

 muzzle ; one on the inner border of each superciliary ; a large one on the 

 vertex, with a smaller confluent with it on each side, and two occipital spots. 

 A dark band passes from the orbit beyond the angle of the mouth. Inferior 

 and superior labials white, punctulated and spotted with brown. Beneath, 

 white, shaded with cream color, (in spirits) ; posteriorly green ; the whole 

 punctulated with brown. A series of brown spots on the flanks, which shade 

 the extremities of the gastrosteges. 



No. 98 differs in having fewer brown rhombs on the back ; and the light 

 transverse vittse extend to the anterior part of the body. The top of the head 

 is uniform brown, without spots, except the occipital pair. Gastrosteges 151 ; 

 anal 1, entire ; urosteges 52. Length 1 ft. 3 in. 



19. T. Castelnaui nob. Bothrops Castelnaudi D. & B. vii. p. 1511. 

 Three spec. South America. Mr. Cuming. 



This species has two nasal plates, with the nostril between them. The 

 superciliary plate rests immediately upon the orbit. 



Var. br achy stoma nob. In this variety the breadth of the head at the 

 angle of the jaws is only two-fifths its length, which is perhaps the result of 

 accident. The labials are 8 above and below, instead of 10 superior and 9 

 inferior. The brown spot on the head is quadrangular, not cordate ; and the 

 labials above and below, and the geneials, are brownish black. In other respects 

 it is exactly similar to the true Castelnaui. Longitudinal rows of scales 23. 

 Scuta 154xlX33. 



One spec. Habitat ? Mr. Cuming. 



T. L an s b erg i i is a third species of this genus. We have not been able 

 to find the' original description, but its prominent characters have been pointed 

 out by Prof. Jan, loc. cit. p. 155. T. nummifer, {Trig, nummifer Kiippel) 

 is probably a fourth species. There is a possibility, but we have not the means 

 at hand for arriving at a decision, that this is identical with Atropos mexi- 

 canus Dam. and Bibr. Vol. vii. p. 521, which has the urosteges entire, and, 

 according to the plate 83, bis. Erp. generale, a small superciliary shield. The 

 latter at least can hardly be considered as congeneric with the Atropos D a r w i n i 

 and puniceus . 



Laches is Daud. 



Hist. Rept. 1803. Copkias Merrem, 1820. 



20. L. mutus Daud. Two spec. Surinam, Dr. Hering. 



Bothrops Wagler. 



In Spix. Rept. Brazil, 1824, p. 50. Craspedocephalus Kuhl (IS ?) Fitzinger 

 (1843), Gray (1849.) 



21. B. lanceolatus Wagl. Two spec. S. America. 



22. B. atrox Wagl. B. leucurus and taniatus Wagl. Trigonocephalus 

 colombiensis Hallow. Proc. Acad. Nat. Sci. ii. p. 246. 



Eight spec. S. America, Mr. Cuming. 



Two ' ' Cocuyas de Veraguas, New Granada. Dr. Mitchell. 



Five " Caraccas, Dr. S. Ashmead. 



One " " Dr. Morris. 



One " Para, Col. Abert. 



Two " loc. ignot. Prof. Bache. 



23. B. a 1 1 e r n a t u s D. & B. 



One spec. Buenos Ayres, Mr. Kennedy. 



One " loc. ignot. ? 



1859.] 



