436 AMPHISBENID.E, 
An infraocular ; a preocular; occipitals 
SIAM «ot va See hg Matkeaieeeean es eae 4, subocularis, p. 440. 
Ocular forming a suture with second and 
third labials; occipitals small ...... 5. pretrii, p. 440. 
Ocular forming a suture with second and 
third labials ; occipitals nearly as large 
as frontals. cidyageas eee eee eae as 6. leucocephala, p. 441. 
Occipitals twice as large as frontals.... 7. mertensit, p. 441. 
2. The segments of the two median ventral rows more than 
twice as broad as long. 
a. Prefrontals distinct; three 
frontals: os esscce ods adatine 20. kraussi, p. 447. 
6. Prefrontals united with the rostral. 
First upper labial distinct; a supraocular 21. leucura, p. 447. 
First upper labial united with the nasal ; 
a small median frontal ............ 22. muellert, p. 448. 
First and second upper labials united with 
the nasal ; only two anal segments .. 24. liberiensis, p. 449. 
B. Not more than four preeanal pores. 
1. Two prefrontals, distinct from the nasals and labials. 
a. Suture between the nasals at least one third as long as 
that between the preefrontals. 
a. Temporals small; 28 to 38 segments in an annulus on 
the middle of the body. 
* Ocular in contact with the second and third upper 
labials. 
216 or more annuli on the body; suture 
between the frontals longer than that 
between the preefrontals .......... 8. vermicularis, p. 441. 
214 or more annuli on the body; suture 
between the frontals a little shorter 
than that between the preefrontals .. 9. darwinit, p. 442. 
** Oculars in contact with the second labial only. 
Four upper labials, two large and two 
BMA) aieiaegs or wvchhvn vee ae we 11. angustifrons, p. 448. 
Two upper labials ...............04. 18. gracilis, p. 444. 
B. Temporals small; 46 segments in an annulus on the 
middle of the body. 
No Occipitals. sco eata phew canted 12. plumbea, p. 443. 
y. A large anterior temporal. 
Head compressed and arched; 256 annuli 
on the body -si.sjeu ces eee Bee dams 14. steindachnert, p. 444. 
180 annuli on the body.............. 18. violacea, p. 446. 
