Cope.] 36 | May 4, 
15. PRocTOTRETUS FITZINGERII Dum. Bibr. IV, p. 286. 
No, 138, from Juliaca, Peru ; altitude 12,550 feet. In this lizard the 
lateral scales are relatively smaller and smoother than in the P. multi- 
formis. 
16. MICROLOPHUS INGUINALIS Cope, Journ. Acad. Phila. 1875. p. 172. 
Nos. 33-34, Chimbote Valley. 2000 feet. 
17. MIcROLOPHUS PERUVIANUS Sess. M. lessont?, Dum. Bibr. IV, p. 336. 
Nos. 31-36, Chimbote Valley. 2000 feet. 
18. PHYLLODACTYLUS NIGROFASCIATUS sp. nov. 
The existence of a fourth species of this genus in Western Peru points 
to this region as its centre of distribution. The present one belongs to the 
group in which the large dermal tubercles are not prominent nor angulate, 
nor arranged in regular longitudinal rows. They are round, and very dis- 
tinct from the small round scales between them, and not almost assimi- 
lated to them as in the P. inwqualis Cope. There are eight superior labials 
to below the pupil of the eye. The mental scutum is very large, and ur- 
ceolate ; it has two lateral, and a short posterior median facet, each one 
corresponding to a scutum. The anterior of these is the first labial, which 
is about twice as large as the scutum that follows it. Behind these is a 
transverse row of five subround scales, of which the median is in contact 
with the mental. The next row embraces eight, arranged in an undulat- 
ing manner. The scales diminish but slowly to the size of the gulars. 
The toes are slender as in the 7. microphyllus Cope, but the expansions 
are large, asin the 7. inequalis. When the limbs are appressed to the 
side, the elbow reaches the base of the toes in this species, but only to their 
tips in the 7. inwqualis ; the length of the toes in 7. microphyllus is in- 
termediate. 
The ground color is very light, brilliantly white on the inferior surfaces. 
Between the axilla and groin the back is crossed above by six narrow 
black cross-bands. These bifurcate or break up on the sides ; the axillar 
band breaks up on the back, and two anterior to it are represented by spots. 
A broad dark band passes from the nostril through the eye and breaks up 
on the sides of the neck. Limbs indistinctly cross-barred. 
M. 
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The very different arrangement of the infralabial scales and the small 
