COLUBER. 115 
Hab. Nortu America, Eastern and South-eastern United States.—Muxico (Mus. Brit.), 
Chihuahua (Cope). 
The specimens which, in my opinion, should be referred to this species vary in the 
number of longitudinal rows of scales, viz. from 25 to 29; all, however, have eight 
upper labials only. 
2. Coluber triaspis. 
Coluber triaspis, Cope, Proc. Ac. N. Sc. Phil. xviii. p. 128 (1866); Proc. Am. Phil. Soc. xviii. 
p. 271 (1879). 
Coluber mutabilis, Cope, Proc. Am. Phil. Soc. xxii. p. 175 (1884). 
Scotophis mutabilis, Bocourt, Miss. Sc. Mex., Rept. p. 680, t. 46. figg. 2, 2a-f. 
Hab. Mexico (Sallé), Guanajuato (Dugés), City of Mexico (Doorman), Tehuantepec 
(Sumichrast), Yucatan (Loucard) ; British Honpuras, Belize (Mus. Brit. ; Cope) ; 
GuatEMaLa, Vera Paz (Cope; Mus. Paris) ; Costa Rica, San José (Cope). 
This form passes into C. guttatus, but has generally smaller scales, viz. 31-35 series. 
Upper labials eight. Abdomen nearly uniform whitish. 
8. Coluber flavirufus. 
Coluber flavirufus, Cope, Proc. Ac. N. Sc. Phil. xviii. p. 319 (1866) ; Proc. Am. Phil. Soc. xxii. 
p- 175 (1884). . 
Natrix flavirufus, Cope, Bull. U. 8S. Nat. Mus. no. 32, p. 71. 
Hlaphis rodriguezi, Bocourt, Miss. Sc. Mex., Rept. p. 683, t. 46. figg. 1, 1 a-e. 
Hab. Mexico (Mus. Brit.), Mirador, Tabasco, and Chiapas (Cope), Yucatan (Schott), 
Ruatan I. (Gawmer); Guatemata, Rio Polochic, Santa Rosa de Panzos (Bocourt). 
Distinguished by nine (ten) upper labial shields. Scales in from 29 to 35 series. 
Possibly not a distinct species. 
4. Coluber chlorosoma, sp. n. (Tab. XL1.) 
Hab. Mexico, Atoyac in Vera Cruz, Amula in Guerrero (4. H. Smith), San Ramon 
1500 feet (A. C. Buller). 
Scales in thirty-three rows, smooth, only the median ones on the back showing 
faint traces of keels. Head rather narrow and elongate; eye of moderate size, 
with round pupil; anterior frontals half, or less than half, the size of the posterior. 
Vertical large, in contact with the preorbital. Loreal longer than deep, with a point 
at posterior angle. One pre-, two postoculars. Hither nine upper labials, of which 
the fifth and sixth enter the orbit, or eight, the fourth and fifth being below the eye. 
The foremost series of temporals consists of three oblique, large, elongate shields, of 
which the two upper are in contact with the postoculars. Upper parts uniform 
greenish olive. On stretching the skin the base of each scale may be seen to be black, 
*15 2 
