10 SYNOPSES AND DESCRIPTIONS. 



white margin extends from a point close behind the angle of the mouth 

 through the eye to the nasal, broadening on the loreal region, and descend- 

 ing across the mouth to the submentals. A short distance in front of the 

 angle of the mouth on the lower jaw there is a rounded brown spot sur- 

 rounded by a white ring, by which it is separated from the edge of the 

 lip. An angular black sj)ot descending from the eye does not reach the 

 labials. Central America. 



Boa mexicana Bapp. 



Boa diviniloquax var. Mexicana Jan, 1864, Icon. Opkid., Livr. V, pi. TV. 



The figure by which this species is known is that of a serpent more 

 closely allied to B. imperator than to B. diviniloquax. The muzzle is 

 broader and more vertically truncate than in the former, and the ground 

 color is more bleached. The pattern of coloration is the same, but some 

 of the lines of the head and the spots and punctulations of the flanks have 

 become obsolete. Nasals diAdcled. Suborbitals in contact with labials. 

 Scales in 55 longitudinal rows. 



