160 
ON THE PHYSIOONOMY OF SERPENTS. 
6. Dipsas irregularis. Habit of Dipsas dendropbila. 
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, which 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, with a smooth surface. S. 180 + 80. A range 
of dorsal plates. Pulmonary cells advance along the 
trachea ; lachrymal and nasal glands much developed ; 
body charged with brown and pale marblings ; sides of 
the back ornamented with spots or bands ; below yellow. 
From Surinam. 
10. Dipsas Mikanii. Resembling 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 
