Tachydrumus. 147 



aud the tynipanuni, its length 3i to 4 times iu length to vent in males, 

 ■i to -ii times in females ; snout acutely pointed, with sharp eauthus 

 and nearly vertical loreal region, a little longer than postocular part of 

 head. Pileus 2i to 2i times as long as broad. Neck narrower than 

 the head. Hind limb reaching the elbow or the axil in females, the 

 axil or the shoulder iu males ; foot a little longer than the head. 

 Tail 2| to 3^ times as long as head aud body. 



Nostril pierced between 3 or 4 shields. Rostral sometimes entering 

 the nostril ; frontonasal as long as broad, or longer than broad ; 

 prefrontals forming a usually extensive suture ; frontal as long as or 

 a little shorter than its distance from the end of the snout, Ih to 2 

 times as long as bi'oad, narrower behind than in front ; parietals 

 1^ to If times as long as broad ; interparietal 1^ to 1 1 times as long 

 as broad, often separated from the very small occipital by one or two 

 small shields or by the parietals meeting iu the middle. 3 or 4 supra- 

 oculars,* first, if present, very small or reduced to a granule, second 

 usually longer than third, fourth sinall and sometimes broken up into 

 granules ; 4 or 5 superciliaries, first aud second elongate, first often in 

 contact with the second supraocular ; a complete or iucomplete series 

 of granules between the supraoculars and the superciliaries. Nasal 

 usually forming a suture with its fellow behind the rostral,t and with 

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

 abseutj ; anterior loreal shorter than second ; 4, rarely 6§ upper labials 

 anterior to the subocular, which is usually not or but little narrower 

 beneath than above. Tempioral scales very small, granular, olitusely 

 keeled, 10 to 15 on a line between the orliit aud the tympanum ; an 

 enlarged anterior upper temporal, exceptionally || iu contact with the 

 fourth supraocular ; a very narrow tymjjanic shield usually present. 



;-> pairs of chin-shields, first or first and second, exceptionally al] 

 three"! iu contact iu the middle. 21 to 34 gular scales iu the median 

 line, anterior granular and faintly keeled, posterior increasing iu size, 

 imliricate, keeled, and merging gradually into the plates of the 



* Of the 11 type specimens before me, o liave 4 supraoculars, 5 have ;i, and 1 

 has 4 on one side and 3 on the other. In the original description I noted 4 

 supraoculars in 19 eases out of 26. 



T Van Denburgh found the rostral in contact witli the fnjntonasal in aliout 

 69 !>. e. of the specimens from Amaima, about 10 p. c. of those from Kilcaig-a, 

 and about 5 p. c. of those from Oliinawa. 



i Absent in one specimen. 



§ On one side only in 3 specimens. 



[j In one specimen. 



11 In one specimen. Van Denburgh found 4 pairs of chin-shields in 12 cases, 

 and 3 on one side and 4 on the other in 16, out of 151 specimens. 



