OCR Text |
Show 200 MR. G. A. BOULENGER ON THE [Feb. 2, b. Upper surface of head covered with small scales ; no labial pits scales keeled 41. Enygrus carinatus. 2. Tail not prehensile; parietal shields very small, or separated from each other by an azygous occipital shield. Ventral shields very small; no azygous occipital. 42. Cylindrophis rufus. Ventrals well developed ; a large azygous occipital, in contact with the frontal. 43. Xenopeltis unicolor. 3. Tail prehensile; body compressed, covered with uniform, small, juxtaposed, rough scales ; no ventral shields. 44. Chersydrus yranulatus. 4. Tail not prehensile ; parietal shields large, forming a suture. a. Internasal shields distinct from the prefrontals; head distinct from neck. a. Pupil round; scales in 15 to 21 rows, keeled; anal divided; ventrals fewer than 200. # Scales in 15 rows. Scales strongly keeled 45. Tropidonotus sarasinorum. Scales feebly keeled 46. Tropidonotus celebicus. *# Scales iu 19 rows. T w o superposed anterior temporals ; 9 upper labials. 47. Tropid. trianguligerus. A single anterior temporal; 9 upper labials 48. Tropidonotus vittatus. T w o superposed anterior temporals; 8 upper labials. 49. Tropidonotus subminiatus. *## Scales in 21 rows 50. Tropid. chrysargoides. j8. Pupil vertical ; scales in 17 or 19 rows. Scales in 17 rows ; subcaudals in two rows 51. Lycodon aulicus. Scales in 19 rows ; subcaudals single 52. Lycodon stormi. y. Pupil round; scales in 13 rows, smooth ; ventrals rounded. 53. Zamenis dipsas. S. Pupil round ; scales in 21 to 25 rows; ventrals more than 200. Scales in 23-25 rows 54. Coluber janseni. Scales in 21 rows 55. Coluber erythrurus. e. Pupil round; scales in 13-15 rows; ventrals angulate laterally, less than 200. Scales in 15 rows, vertebrals strongly enlarged... 56. Bendrophis pictus. Scales in 13 rows, vertebrals scarcely enlarged ... 57. Bendrelaphis terrificus. b. Internasal shields distinct from the praefrontals; head small, not distinct from neck ; scales in 15 rows. a. Parietal separated from labials by temporals; a praeocular. 58. Oligodon waandersii. [3. Parietal in contact with labials. Nostril between two nasals ; no preocular ; praefrontal entering the eye. 59. Agrophis sarasinorum. Nasal single ; a praeocular 60. Rhabdophidium Jorsteni. c. Internasals fused with the prefrontals; head small, not distinct from neck ; scales in 13 rows. a. Five upper labials, third and fourth entering the eye. » Anterior chin-shields in contact with the symphysial. t Ventrals 130-187. | Frontal three or four times as broad as the supraocular. Snout pointed ; rostral as deep as broad 61. Calamaria acutirostris. Snout rounded ; rostral broader than deep 62. Calamaria nuchalis. |