160 ON THE PHYSIOGNOMY OF SERPENTS. 



6. DiPSAS IRREGULARIS. Habit of Dipsas dendrophila. 

 Of a strong make : dorsal scales of the same size as the rest ; 

 occipital scales very small ; subcaudal plates often simple. 

 Of an olive-brown colour, relieved by dark and narrow 

 bands, wliich descend from the back obliquely backwards, 

 but which are effaced by age. 23 rows of scales. S. 

 250+ 100. Native country, Celebes and Amboina. 



7. DiPSAS coLUBRiNA. Dorsal scales as in the last, 

 which it resembles also in its tints ; but it has a much 

 less elongated form, a short and vigorous tail, a body sur- 

 rounded with 27 rows of scales, and ornamented with six 

 series of dark spots, disposed in a quicunx order. S. 

 183 + 67. Inhabits the Isle of Bourbon and Madagas- 

 car. 



8. DipsAs ^GYPTiACA. Allied to D. irregularis in 

 habit and defect of large dorsal scales ; but has a less 

 strong make, a body less high, and a smaller head, which 

 is very depressed and obtuse. It has but a single pair 

 of mental scales, and a brown smoke-grey colour, with 

 numerous pale obsolete bands. The scales are small, in 

 41 rows. S. 256 + 74. 



9. DiPSAs NEBULATA. Small size. Head very high ; 

 muzzle short and high ; no frenal plate. Form less slen- 

 der than usual ; teeth delicate and comb-like. 15 rows 

 of scales, vrith a smooth surface. S. 180 + 80. A range 

 of dorsal plates. Pulmonary cells advance along the 

 trachea ; lachrpnal and nasal glands much developed ; 

 body charged with broAAni and pale marblings ; sides of 

 the back ornamented with spots or bands ; below yellow. 

 From Surinam. 



10. DiPSAS MiKANii. Kesembling the preceding, but 

 with a head more lengthened, a muzzle very thick and 

 rounded, a trunk less high, and dorsal scales less deve- 

 loped. Above of a yellowish-brown, marbled with brown, 

 and varied with broad spots, or dark bands ; end of the 

 muzzle and collar white. S. 170 + 58. This species ap- 

 pears to replace the preceding in Brazil. 



11. Dipsas Weigeli. Form exceedingly slender and 

 delicate ; head small, broad at the base, and conical ; 

 tail half the length of the trunk ; dorsal scales very 

 broad. S. 256 + 160. Above of a yellowish or reddish 



