KACHUGA. 41 



versely enlarged, baud-like scales. Brown above, yellowish below ; 

 nape with red longitudinal lines. 



Length of shell 15 inches. 



Hab. Northern Peninsular India ; Ganges, Kistna, and Godavari 

 rivers; Burma. 



37. Kachuga trivittata. 



Emys trivittata, Dum, $ Bibr. Erp. Gen. ii, p. 33 1. 



Batagur trivittata, Theob. Jour. Linn. Soc. x, 1808, p. 14, and Cat. 



p. 20. 



Kachuga peguensis et trilineata, Gray, P. Z. S. 1869, p. 200. 

 Batagur iravadica, Anders. An. Zool. Res. Yunnan, p. 736, pis. Ixiv, 



Ixv, Ixviii, & Ixix. 

 Kachuga trivittata, Bouleng. Cat. Cliel. SfC. p. 55. 



Differs from the preceding in the much narrower alveolar sur- 

 face of the jaws, the median ridge of the upper jaw being nearer 

 the inner than the outer margin ; choanae between the orbits ; 

 the width of the lower jaw at the symphysis is less than the dia- 

 meter of the orbit. Considerable uncertainty prevails in the dis- 

 tinction of isolated shells of this species from the preceding. The 

 male B. trivittata is characterized by three black longitudiinal 

 bands on the carapace, which are absent in the female according to 

 Theobald, whose opinion I am disposed to endorse rather than 

 that of Anderson, who makes a distinct species (B. iravadica) for 

 the specimens (females and young males) without bands. 



Length of shell 22 inches. 



Hab. Irrawaddy river from Bhamo to Bangoon ; Tenasserim. 



38. Kachuga dhongoka. 



Emys dhongoka, Gray, III. Ind. Zool. ii, pi. Ix. 



Batagur dhongoka, Gray, Cat. Sh. Rept. i, p. 36, pi. xviii ; Gunth. 



Rept. B. I. p. 42 ; Theob. Cat. p. 22. 

 Pangshura leithii, Gray, Suppl. Cat. Sh. Rept. i, p. 60. 

 Kachuga dhongoka, Bouleng. Cat. Chel. fyc. p. 56. 



Carapace much depressed, keeled in the young, the keels reduced 

 to a knob on each of the anterior vertebrals in the adult ; posterior 

 margin crenulated. Nuchal shield small, trapezoid, broadest 

 behind ; first vertebral usually narrower in front than behind, with 

 sinuous lateral borders ; second vertebral broader than long in the 

 young, longer than broad in the adult, posterior border pointed or 

 more or less produced, fitting into an emargination of the third 

 vertebral, which is shorter than either the second or the third. 

 Plastron angulate laterally in the young ; front lobe truncate, hind 

 lobe angularly notched, shorter than the width of the bridge ; the 

 longest median suture is between the abdominals ; suture between 

 the gulars as long or nearly as long as that between the humerals ; 

 the suture between gulars and humerals forms a right angle, and 



