178 W. Theobald — On Indian and Burmese Species o/'Trionyx. [August, 



Section A. 

 Mandible smooth m front inside, or traversed by a median furrow or 

 depression. 



1. Head ornamented with radiating black lines in the young, and 

 ocelli on the back. In aged individuals some thick black lines or markings, 

 generally present. Colour a more or less lively olive green. Mandible 

 smooth inside. T. Gangeticus, Cuv. 



2. Head ornamented with two conspicuous yellow temple patches and 

 one across the snout. No black lines on the head, but more or less reticu- 

 late mottling. Ocelli in the young. Colour darker and more dusky than 

 in Gancjeticus. Mandible in front subspatulate with a deep central groove 

 Profile of head elongate (P. A. S. B. 1875, PI. IV). 



T. ocellatus, Buch. Ham. 



3. Young ocellated and with the yellow temporal patches, but no 

 band across the snout. Profile intermediate between Oangeticus and ocel- 

 latus. Mandible with a central internal groove. Adult (the presumed T. 

 C/iim of Buch. Ham.) brown, profusely spotted with paler. 



T. sewaabe, Buch. Ham. 



All these three species inhabit the Granges valley and perhaps other 

 parts of Hindustan, but are not authentically known from east of the Bay 

 of Bengal. 



Section B. 

 Mandible in front, traversed inside by a median ridge. 



4. Head regularly marbled with dark reniform spots. Osseous granu- 

 lations on sternum sparingly developed, and only fully on animals of a large 

 size. Young ocellated. (P. A. S. B. 1874, PI. IV). 



T. Phatbei, Theob. 



5. Head dark irregularly spotted somewhat as in the last. Osseous 

 granulations on sternum well developed in young individuals. (P. A. S. B. 

 1875, PL III). . T. Gbayii, Theob. 



6. Head very elongate profusely yellow-spotted. Osseous granulations 

 or sternum well developed. (P. A. S. B. 1871, PL III). 



T. STELLATUS, Sclll. 



7. Head uniform dusky grey, minutely punctulated with black. 



T. Peguensis, Gray. 



8. Head sparingly and irregularly yellow-spotted. A dark saddle- 

 shaped band across the back. No ocelli. Young only known. (P. A. S.B. 

 1875, PL V). T. EPiiiPPiUM, Theob. 



