300 MF. G. A. BOULENGER ON THE 



Two species : — 



12 to 15 scales from e^-e to ej'e across forehead ; tail pointed, ending 



in a conical scute JE. thehaicus^ 



5 to 7 scales from eye to ej'e across forehead ; tail obtuse JS. Jamhis. 



1. Eryx thebaicus Eeuss, Mas Senckeub. i. 1834, p. 134; 

 Bouleng. Cat. Sn. i. p. 125. 



Upper Egypt to East Africa. 



2. Eryx jaculus. 



Anguis jaculus Linn. S. N. i. p. 391, 

 Eryx jaculus Bonleng. Cat. Su. i. p. 124. 

 Algeria, Egypt, Syria, Asia Minor, Greece. 



Family CoLUBRiDiE. 



Three parallel series : — • 



No poison-fangs ; all the teeth solid A. Aglj'pha. 



Poison-fangs behind B. Opisthoglj-pha . 



Poison-fangs ill front C. Protevoglypha. 



A. Aglypha. 



I. Loreal present ; scales in 19 rows or more. 



A. Scales strongl.y keeled, in 19 to 23 rows ; j)upil round; a 



single anterior temporal Tropidonotus. 



B. Scales smooth or feebly keeled ; 2 to 4 superposed anterior temporals ; rostral 



not twice as broad as deep. 

 Head elongate ; snout rount"; 1 at the end ; pupil round ; one or 



more suboculars ; ventra.o 195-278; subcaudals 65-154 Zamenis. 



Snout cuneiform, rostral four-sided ; pupil vertically elliptic or 



subelliptic; ventrals 160-188; subcaudals 35-46 Lytorliynchus. 



Snout rounded or obtusely pointed ; pupil round ; no suboculars; 



ventrals 170-200 ; subcaudals 49-72 Coronella. 



II. Loreal present or absent; scales in 15 rows, smooth ; snout 



stronglj' projecting Oligodon. 



III. Loreal absent; pupil vertical; scales in 23 to 27 rows, 



strongly keeled Basypeltis. 



1. Tropidonotus. 



Kuhl, Bull. >Sc. Nat. ii. 1824, p. 81; Bouleng. Cat. Sn. i. 

 p. 192. 



Synopsis of the S'jjecies. 



Scales in 19 rows ; third and fourth upper labials entering the eye; 



tipper postocular not in contact with the temporal T. natri.v. 



Scales in 19 rows; fourth or fourth and fifth upper labials entering 



the eye; upper postocular not in contact with the temporal . . T. tessellatiis. 

 Scales in 21 or 23 rows; third and fourth upper labials entering 



the eye ; upper postocular in contact with the temporal T. viperinus. 



1. TROriDONOTUS NATRIX. 



Coluber natrLv Linn. S. IS", i. p. 380. 



