BOTHRIECHIS. 191 
upper labials; the second does not enter into, and the third is almost immediately 
below, the facial pit; the fifth is the largest, below the eye, from which it is separated 
by two series of very small scales; the posterior gradually decrease in size. Ten lower 
labials. Ventrals 142; subcaudals 28, the tail being short, very thin, and not prehensile. 
Upper parts uniform brown ; a black band runs from the eye to behind the angle of 
the mouth ; labial shields yellow; a series of rounded, black, light-edged spots along 
the side of the anterior part of the trunk. Lower parts yellowish, marbled with 
blackish in the posterior half of the body; an irregular series of subquadrangular 
black spots along each side of the anterior half of the belly. 
The largest specimen, a female, measures 174 inches, the tail occupying 13. 
8. Bothriechis ophryomegas. 
Bothrops ophryomegas, Bocourt, Ann. Sc. Nat. (5) x. p. 201 (1868). 
Hab. Guatemaa, Escuintla (Bocourt). 
Not seen by me. 
9, Bothriechis nummifera. 
Atropos mummifer, Riipp. Verz. Senckenberg. Mus., Rept. p. 21. 
Teleuraspis nummifer, Cope, Proc. Ac. N. Sc. Phil. 1859, p. 339 ; 1860, p. 349 ; Ginth. Ann. & 
Mag. N. H. 1863, xi. p. 25, t. 3. fig. C (head). 
Bothrops nummifer, Jan, Iconogr. Ophid. xlvii. t. 5. fig. 2. 
Bothriechis nummifera, var. notata, Fisch. in Wiegm. Arch. 1880, p. 222, t. 8. figg. 10-12. 
Atropos mexicanus, Dum. & Bibr. Erpét. vii. p. 1521, t. 83 bis. 
Bothriechis mexicanus, Cope, Proc. Ac. N. Sc. Phil. 1861, p. 294. 
Bothrops affinis, Bocourt, Ann. Sc. Nat. (5) x. p. 201 (1868). 
Bothriopsis affinis, Cope, Proc. Ac. N. Sc. Phil. 1871, p. 209. 
Hab. Mexico, common as far north as Tuxpan (Cope), Huatuzco in Vera Cruz 
(Godman), Teapa in Tabasco (H. H. Smith); Guaremata, Lower Vera Paz 
(Godman & Salvin), San Agustin, alt. 610 metres (Bocourt), Coban (Sarg) ; 
Nicaragua, Hacienda Rosa de Jerico (Rothschuh) ; Costa Rica (Cope). 
This species has been split into two, on the strength of a few minute scales being 
sometimes intercalated between the rostral and nasal. It was therefore of some 
interest to clear up this matter by an examination of embryos taken from the oviduct 
of the same mother. The mother possesses those supplementary scales, but her 
offspring were found to vary in this respect. 
10. Bothriechis scutigera. 
Bothriechis scutigera, Fisch. in Wiegm. Arch. 1880, p. 218, t. 8. figg. 8, 9 (head). 
Hab. Guatemata (Pischer). 
