LEPTODIRA. 169 
1. Leptodira nigrofasciata. 
Leptodira nigrofasciata, Giinth. Ann. & Mag. N. H. 1868, i. p. 425. 
Hab. Nicaragua (Seemann). 
Scales in nineteen rows. Anterior frontals nearly square, two-thirds the size of 
posterior ; vertical as long as the snout, and a little shorter than the occipitals; loreal. 
as high as long. One preocular, not quite reaching to the vertical; a minute lower 
preocular on one side of the head; one postocular ; anterior temporal separating 
entirely the occipital from the upper labials. Eight upper labials, the third, fourth, 
and fifth entering the orbit. Temporals 1+2+3. Ventrals 174; subcaudals 74. 
Body with sixteen broad black cross-bands, which are from three to four times 
broader than the interspaces of the whitish ground-colour, and confluent on the posie- 
rior part of the trunk. Head black above, separated by a white collar from the first 
black band ; tail with about eight black bands. Lower parts whitish. 
One specimen, 14 inches long, of which the tail takes 34. 
2. Leptodira pacifica. 
Leptodira pacifica, Cope, Proc. Ac. N. Se. Phil. (1868) 1869, p. 310. 
Hab. Mexico, Mazatlan (Cope), Presidio (Lorrer). 
Scales in nineteen rows. Anterior frontals nearly square, one-third the size of 
posterior; occipitals elongate, truncate behind; loreal as high as long. Two pre-, 
two postoculars, the upper much larger than the lower. ‘Temporals 1+ 2, the anterior 
entirely separating the occipital from the labials. Seven upper labials, the third and 
fourth entering the orbit. Ventrals 164; subcaudals 61. 
Bright rosy-brown, with four or more series of blackish-brown very small spots, of 
which the median pair may form short cross-bars by their union. A whitish spot on 
the nape, longitudinally divided by a black bar, and a number of small spots on the 
upperside of the head. Uniform cream-coloured below. 
8. Leptodira mystacina. 
Leptodira mystacina, Cope, Proc. Am. Phil. Soc. xi. p. 151 (1869) *. 
Hab. Mexico, Tehuantepec (Sumichrast). 
Scales in nineteen rows. Anterior frontals nearly square, one-half the size of poste- 
rior; vertical as long as the snout, and a little shorter than the occipitals ; loreal as 
high as long. ‘Two pre-, and two postoculars, the lower small in both sets; the upper 
preocular in contact with the vertical. Temporals 1+2-+3; the foremost temporal 
is separated from the postocular either by a minute intercalated scute, or by the sixth 
labial, which touches the occipital. Eight upper labials, the (third), fourth, and fifth 
entering the orbit. Ventrals 193-4, 187 (Cope). 
* In Proc. U.S. Nat. Mus. xiv. 1892, Mr. Cope unites this form with Leptodira nigrofasciata (p. 678). 
BIOL. CENTR.-AMER., Rept., May 1895. #99 
