172 On new Snakes from German East Africa. 
Aparallactus Wernert. 
Diameter of the eye greater than its distance from the oral 
margin. Rostral twice as broad as deep, the portion visible 
from above nearly half as long as its distance from the frontal ; 
internasals much shorter than the prefrontals; frontal once 
and a half as long as broad, longer than its distance from the 
end of the snout, as long as the parietals; nasal entire, in 
contact with the preocular ; two postoculars, in contact with 
the anterior temporal; temporals 1+1; six upper labials, 
second and third entering the eye; first lower labial in contact 
with its fellow behind the symphysial; two pairs of chin- 
shields, the anterior broader and a little longer and in contact 
with three lower labials. Scales in 15 rows. Ventrals 147- 
160; anal entire; subcaudals 32-41. Blackish above, with 
a deep black, somewhat light-edged nuchal collar; upper lip 
blackish below the eye, yellowish in front and behind ; lower 
parts uniform yellowish. 
Total length 390 millim. ; tail 65. 
Two specimens, male (V. 147; C. 41) and female (V. 160; 
. 82). 
The genus Aparallactus, Smith, 1848, is identical with 
Uriechis, Peters, 1854, as I have pointed out before. Hleven 
species may be distinguished :— 
I. Two prefrontals. 
A. Symphysial not in contact with the chin- 
shields. 
1. Two postoculars, in contact with a tem- 
poral; nasal entire, in contact with the 
preocular, 
Third and fourth upper labials entering the eye. 1. A. Jacksoni, Gthr. 
(1. Africa.) 
Second and third upper labials entering the eye. 2. A. Werneri, Blyy. 
(E. Africa.) 
2. A single postocular; one labial in con- 
tact with the parietal. 
Nasal entire, not in contact with the preocular. 3. .4. concolor, Fischer. 
(EK. Africa.) 
Nasal divided, in contact with the preeocular.. 4. A. dunulatus, Ptrs. 
(EK. Central Africa, Mozambique. ) 
B. Symphysial in contact with the chin- 
shields. 
1, Third and fourth upper labials entering 
the eye. 
Nasal divided ; ventrals 154-180; subcaudals 
een Reh es hn ae RRS Gircte the ta ott WPS 5. A, Guentheri, Blgr.* 
(Kk. & C. Africa, Angola.) 
* Uriechis capensis, part., Gunther, 1888, Bocage, 1895. 
