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 spot descending from the eye does not reach the 
labials. Central America. 
Boa MEXICANA Rapp. 
304 DIVINILOQUAX var. Mexicana Jan, 1864, Icon. Ophid., Livr. V, pl. IV. 
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 divided. Suborbitals in contact with labials. 
Scales in 55 longitudinal rows. 
