172 OPHIDIA. 
upper labials, the (third) fourth and fifth entering the orbit. Temporals 14+2+3. 
Anterior and posterior chin-shields subequal in length. Ventrals 168-176. 
A white or whitish collar, not divided in the middle by a blackish longitudinal 
streak. Gyround-colour lighter than the rhombic spots on the back, which on the trunk 
are about twenty-five in number. In young specimens the ground-colour is almost 
white and the spots are nearly black, but with age the contrast of colours is less striking. 
The upper part of the head, again, is black or brown. Lower parts whitish. 
A common species. 
9. Leptodira polysticta, sp.n. (Tab. LV. fig. A.) 
Leptodeira annulata, part., Giinth. Cat. Col. Sn. p. 166. 
Hab. Mexico, Jalapa (Hoge), Oaxaca (Sallé), Yucatan (Mus. Brit.) ; British HonDuras, 
Belize (Godman); Honpuras (Dyson); Panama (Mus. Brit.). 
Scales in twenty-three rows; in twenty-one in a specimen from Yucatan. Anterior 
frontals one-half or more of the size of the posterior. Vertical as long as, or shorter 
than, the snout, and shorter than the occipitals; loreal as long as high. Preoculars 
two or three, of which the upper is the largest, and reaches or nearly reaches the 
vertical; two postoculars. Eight upper labials, of which the fourth and fifth enter 
the orbit. Temporals 1+2+3. Anterior and posterior chin-shields subequal in 
length. Ventrals 192-211. 
A whitish collar is not always distinct, but whether present or not, a brown or black 
longitudinal line divides the neck. Back with a series of numerous small transverse 
bars, not extending to the ventrals; a series of very small spots along each side of 
the body. 
10. Leptodira ocellata, sp.n. (Tab. LV. fig. B.) 
Hab. Nicaragua, Chontales Mines (Ria); Costa Rica (Mus. Brit.). 
Scales in twenty-three rows. Anterior frontals about one-third of posterior; vertical 
rather shorter than occipital; loreal large, square. Preeoculars two, the lower very 
small, the upper reaching the vertical or nearly so; sometimes a detached portion of a 
labial forms a third preocular; two postoculars. Eight upper labials, of which the 
fourth and fifth enter the orbit. Temporals 1+2+43. Anterior and posterior chin- 
shields equal in length. Ventrals 165-170. 
Ground-colour reddish- or brownish-olive; a series of dark brown transverse or 
irregularly-rounded spots along the back, which do not descend to the sides, and are 
about thirty-eight in number on the trunk. Sides with a series of round brown spots, 
the spots being opposite to the interspaces of the ground-colour and accompanied 
by smaller irregular spots. Neck without a distinct collar, and longitudinally 
divided in the middle by a brown narrow line proceeding from the first dorsal spot. 
