Tachydronuis. 145 



limb reachintr the wrist in females, the elbow in males ; foot as long 

 as the head. Tail a little over twice the length of head and body. 



Nostril pierced between o to 5 shields. Eostral usually enteriug' 

 the nostril ; upper head-shields rugose ; frontonasal broader than 

 long, not or l>ut slightly broader than the internarial space ; pre- 

 frontals forming an extensive suture ; frontal as long as or shorter 

 than its distance from the end of the snout, ll to If times as long as 

 broad, of subequal width throughout or a little narrower behind than 

 in front ; parietals 1^ to If times as long as broad ; interparietal 1^ to 

 2 times as long as broad, much longer than the occipital, which may 

 be broader. 3 supraoculars, first longer than second and usually in 

 contact with the second loreal ; 3 superciliaries, second longest : no 

 granules between the supraoculars and the superciliaries. Nasal 

 forming a suture with its fellow behind the rostral and with the 

 anterior loreal above the postnasal, which may be very small or 

 absent, in which case the anterior loreal borders the nostril ; anterior 

 lo)-eal shorter than second ; 3 or 4 upper labials * anterior to the 

 subocular, which is not or but little narrower beneath than above. 

 Temporal scales moderately large or rather small, hexagonal, keeled ; 

 one, two, or three large upper temporals, first sometimes in contact 

 with the fourth supraocular ; a long and narrow tympanic shield. 



3 pairs of chin-shields, first and second in contact in the middle. 

 17 to 22 gular scales in the median line, anterior narrow, juxtaposed, 

 smooth or faintly keeled, posterior increasing in size, imbricate, keeled, 

 and merging gradually into the plates of the very distinct collar, which 

 are pointed, keeled, and 10 or 11 in number. 



Dorsal plates truncate or shortly mucrouate behind, in 6 or 8 

 longitudinal series on the neck and 4 on the body. Ventral plates 

 obtusely pointed or shortly mucronate, strongly keeled, in 12 longi- 

 tudinal and 22 to 25 transverse series. Sides with one upper and one 

 lower series of smaller keeled scales and an intermediate granular area. 

 26 to 28 plates and scales round the middle of the body. Preanal 

 plate rather large, smooth or feebly bicarinate, bordered by a semi- 

 circle of small keeled plates. 



Upper surface of limbs with rhombic keeled scales. 2 or 3 femoral 

 pores on each side. Subdigital lamellae single, 19 or 20 under the 

 fourth toe. 



Caudal scales strongly keeled and mucronate, the keels forming four 

 very strong ridges on the upper surface of the basal part ; the whorls 

 nearly equal in length, the fourth or fifth containing 14 or 16 scales. 



Olive above, with a yellowish or greenish white, usually black-edged 

 * 3 in two specimens, 4 in two, 3-4 in the two otliers. 



vol,, n. 10 



