8. LEPIDOSTERNON. 461 
Synopsis of the Species. 
I. Rostral separated from the frontal by the preefrontals. 
A. First lower labial much larger than second. 
1. Two upper labials, first larger than second. 
Frontal as long as broad, or broader 
than long ...s seacekew ies apeae 1. microcephalum, p. 462. 
Frontal longer than broad ; supraocu- 
lar distinct v2ae.ccawse ene er gaas 2. phoccena, p. 463. 
Frontal longer than broad ; supraocu- 
lar united with the prefrontal .... 3. strauchit, p. 463. 
2. Three upper labials, first smaller than second. 
Ocular separated from the third labial 
by asubocular ................ 4. infraorbitale, p. 463. 
No subocular .............. 0.000. 5. rostratum, p. 464. 
B. First lower labial very small, second large. 
Frontal broader than long.......... 6. petersit, p. 464. 
Frontal small, longer than broad .... 7. polystegum, p. 464. 
II. Rostral in contact with the frontal, 
A. Frontal not, or but slightly, extending posteriorly beyond the 
ocular. 
1. Frontal a little broader than 
long; parietals and occipitals 
present; head very uneven 
with longitudinal and trans- 
verse ZTOOVES .......+...0-5 8. crassum, p. 465, 
2. Frontal longer than broad. 
a. No occipitals; nine or ten 
large elongate pectoral shields 
on a transverse line ...... 9. wuchereri, p. 466. 
6. Occipitals distinct. 
u. Supraocular distinct. 
Frontal octagonal; occipitals twice as 
broad as long; three upper labials . 10. guenthert, 466, 
Frontal octagonal; occipitals twice as 
broad as long; two upper labials .. 11. boettger2, p. 466. 
Frontal hexagonal ; occipitals thrice as 
broad as long; two upper labials .. 12. affine, p. 467. 
jf. Supraocular fused with the prefrontal. 
Only the point of the frontal in con- 
tact with the rostral; first upper 
labial twice as long as second .... 13. boulengeri, p. 467. 
