456 AMPHISBENIDE, 
3. Monopeltis welwitschii. (Prarz XXIV. fig. 2.) 
Dalophia welwitschii, Gray, Cat. Sh. Rept. ii. p. 41. 
Dalophia welwitschii, Gray, Proc. Zool. Soc. 1865, p. 454, fig. 
Rostral very small, triangular, with truncate anterior angle, the 
inner angles of the nasals shortly separated; a single plate covering 
the head, with a short suture in front of the ocular, which is small : 
eye not distinguishable ; a pair of band-like occipitals; three upper 
labials, third large ; mental small, quadrangular, followed by a larger 
pentagonal chin-shield; three lower labials, first and second small, 
third very large. ‘Two hundred and seventy-one or two hundred and 
seventy-five anuuli on the body and twenty-two or twenty-three on 
the tail; on the middle of the body an annulus comprises thirty- 
four segments, twenty above and fourteen below the lateral lines; 
the dorsal segments much longer than broad, the two median ventrals 
much broader than long in the posterior part of the body. Pectoral 
shields six, large, very elongate, the median pair widening a little 
posteriorly, forming an angle anteriorly ; its length equals the 
distance between the posterior edge of the occipitals and the end of 
the snout. Lateral line distinct. Anal segments six. No preanal 
pores. Colourless, head-shields yellow. 
millim 
Length to vent ...........5.. 265 
TPE i a) aia, ginko, fn gad ve atone gS AOS 24 
Diameter of body ............ 6 
Angola. 
a-b, Ad. Pungo Andongo. Mr. Welwitsch [C.]. (Types.) 
4. Monopeltis guentheri. (Prats XXIV. fig. 3.) 
Premaxillary tooth 1; maxillaries 2—2; mandibulars 6—6. 
Snout acuminate. Rostral pentagonal, widely separating the nasals ; 
a single shield covering the head, with a short suture from above a 
preocular, which is larger than the small ocular; eye scarcely dis- 
tinguishable; a pair of band-like occipitals; three upper labials, 
first smallest, second longest, third deepest ; mental small, quadran- 
gular, followed by a larger, heptagonal chin-shield; three lower 
labials, first and second small, third very large. Two hundred and 
fifty to two hundred and fifty-four annuli on the body; an annulus 
on the middle of the body comprises twenty-eight or thirty-two 
segments, sixteen or eighteen above and twelve or fourteen below 
the lateral lines ; the dorsal segments much longer than broad, the 
two median ventrals much broader than long, especially in the pos- 
terior part of the body, where they are nearly or quite twice as 
broad as long. Pectoral shields six, large, very elongate, of equal 
width throughout their length, the inner pair slightly longer than 
the outer, and forming an angle anteriorly; its length equals the 
distance between the posterior border of the occipitals and the end 
