8 CHELONIA. 
Distinguished by the absence of markings on the upper side of the head and neck ; 
this species will be easily recognized. I have not seen specimens of it. 
11. Emys areolata. (Tab. VIII. fig. B.) 
Emys areolata, Aug. Dum. Cat. Rept. p. 10; Arch. Mus. vi. 1852, p. 223, t. 14 (the artist intro- 
duced into this figure six vertebral and five costal scutes) ; A. Dum. & Bocourt, Miss. Sc.. 
Mex., Rept. p. 18. 
? Chelopus areolatus, Cope, Proc. Ac. Sc. Phil. 1866, p. 123. 
Hab. Guatemaa, Lake of Peten (Salvin, coll. Brit. Mus.). 
Neck with four parallel, white, black-edged bands, the outer of which are far down 
on the side, and continued forwards over the temple into the supraciliary region ; the 
inner commence from the occipital region. Crown of the head indistinctly marbled ; 
a whitish line along the median line of the upper part of the snout. A minute white 
speck in front of the upper angle of the orbit (much smaller than in £. scabra). Cheek 
and tympanic region with irregular blackish markings; throat sparsely and minutely 
spotted with black. Central parts of the sternum blackish or black. Shell depressed, 
oblong, with the lateral edges sharp, curved upwards. Nuchal equilateral, triangular ; 
vertebrals slightly keeled. Toes scarcely webbed. 
The typical specimen came from Lake Peten; the specimen in the British Museum 
was collected by Mr. Salvin in the same district, and referred by Gray first to E. scabra 
and afterwards to L. annulata. 
Emys pulcherrima of A. Duméril and Bocourt (Miss. Sc. Mex., Rept. p. 15, t. 7) is 
not the species described under that name by Gray; it represents a menagery-specimen 
without precise information as to locality, which has been named Rhinoclemmys bocourti 
by Gray (Ann. & Mag. N. H. 18738, xii. p. 111), and which possibly may prove to be 
identical with £. areolata. 
12. Emys rubida. (Tab. VIII. figg. C, C’, C".) 
Chelopus rubidus, Cope, Proc. Am. Philad. Soc. (1869) xi. 1871, p. 148. 
Rhinoclemmys mexicana, Gray, Proc. Zool. Soc. 1870, pp. 659, 723; Suppl. Cat. Shield Rept. p. 30; 
Proc. Zool. Soc. 1871, p. 296, t. 28. 
Chelopus mexicanus, Bocourt, Journ. Zool. 1876, v. p. 387; Sumichrast, Bull. Soc. Zool. France, 
1880, p. 166. 
Hab. Mexico, San Juan del Rio (Rébouch, coll. B. M.), Tehuantepec (Sumichrast, 
coll. B. M.). 
The coloration of the soft parts, although varying somewhat in details, is character- 
istic enough. A narrow yellow(?) band runs round the edge of the snout, from one 
orbit to the other ; a second much broader one, horseshoe-shaped, with the convexity 
towards the front, occupies the crown of the head, and is mixed up posteriorly more or 
less with the markings of the occiput, which, like those of the neck, consist of blackish 
