274 Mr. A. W. E. O’Shaughnessy on 
A. cybotes, Cope, Proc. Acad. Philad. 1862, p.177; Proc. Am. 
Phil. Soc. 1869, p. 164. 
A, Riise’, Reinh. & Liitk, 1. ¢, p. 264. 
Specimens (male and female) from San Domingo. 
A. gibbiceps, Cope, Proc. Acad. Philad. 1864, p. 174. 
The type (female) from Caracas. 
A, citrinellus, Cope, Proc. Acad, Philad, 1864, p. 170. 
The type from San Domingo. 
A, damulus, Cope, Proc. Acad. Philad, 1864, p. 169. 
- The type presented by Dr. Giinther. 
A, insignis, Cope, U.c. 1871, p. 213. 
A fine specimen, brought from Costa Rica by Mr, Salvin, 
agrees with Mr. Cope’s recent description of this well-marked 
species. 
A. Bouviert, Bocourt, Miss. Se. Mex. ui. p. 58, pl. xiv. fig. 8. 
Three specimens from Pebas and Guayaquil. The tail, 
perfect, is compressed and has the upper edge serrated, as 
described by M. Bocourt. 
A. transversalis, Dum. Cat. Rept. p. 57; Arch. du Mus. viii. 
p- 515, pl. xix. fig. 3; Guichen. in Casteln. Amér. du 
5. Reptvp. LF. 
A. impetigosus, Cope, Proc. Acad. Philad. 1864, p. 174. 
Mr. Cope’s type, of which the habitat is unknown, being in 
the collection, I am able to refer it to the above species, de- 
scribed by Duméril. 
A. heterodermus, Dum. /.c. p. 59, and l.c. p. 516, pl. xix. 
fig. 4. 
Adult and half-grown specimens from Bogota enable me 
to add this other remarkable species, described by Duméril, 
to the list. 
B. Ventral scales keeled. 
A, (Dactyloa) biporcatus, Wiegm. Herp. Mex. p. 47; Bocourt, 
Miss. Sc. Mex. p. 98, pl. xv. fig. 8. 
A, (Draconura) vittigerus, Cope, Proc. Acad. Philad. 1862, p. 179, 
A single specimen from Rio Polochic, Guatemala, presented 
