Acanthodadijlus. 79 



Acanthothictylits »ijriacus, Boulentr. Proc. Zool. Soc. 1881, p. 745, 

 pi. Ixiii, fig. 4, aud Cat. Liz. iii, p. 61 (1887) ; Werner, Jahrh. Nat. 

 Ver. Magdel). 1896-97, p. 128 (1898). 



Acauflioilacfyluii schreiberl, Bouleng. tt.cc. pp. 746, 62 ; Lataste, t.c. 

 p. 505 ; Bouleug. Bull. Soc. Zool. France, 1918, p. 147. 



Acantlwdadylus gchreiheri, var. syriacns, Bouleng. t.c. p. 15o. 



Habit ratlier slender, body moderately depressed. Head If to 

 Ij times as long as broad, its length 3 J- to a little over 4 times in 

 length to vent, its depth equal to the distance between the centre 

 of the eye and the tympanum ; a more or less distinct lanceolate 

 concavity from the frontonasal to the middle of the frontal ; snout 

 obtusely pointed, as long as the postocular jsart of the head or a 

 little longer (not more than IJ), -with rather sharp canthus aud feebly 

 concave loreal region; nasals feebly swollen. Pileus Ij to 2 times 

 as long as broad. Neck as broad as the head. The hind limb reaches 

 between the collar and the ear, rarely the ear, in males, the collar 

 in females ; foot 1 J to If times as long as the head ; fourth toe, fi-om 

 the base of the fifth, 1 to IJ times as long as the head. Tail H to 

 2 times as long as head and body. 



Upper head-shields convex. Suture between the nasals } to i the 

 length of the frontonasal, which is as long as broad or a little broader 

 than long, aud a little broader than the internarial space ; prefrontals 

 longer than broad, usually formiug a suture* ; frontal as long as or 

 shorter than its distance from the end of the snout, IJ to 2 times 

 as long as broad, rounded or formiug an obtuse angle in front, narrow 

 behind ; parietals as long as broad or a little longer than broad, 

 outer border straight or concave. Four large supraoculars, in contact 

 with each other, first shorter than second, its outer border entirely 

 or nearly entirely in contact with the first superciliary, second often 

 longer than third, fourth smallest ; 6 or 7, rarely 8, superciliaries, 

 first longest ; a single series of granules between the supraoculars 

 and the superciliaries. Anterior loreal shorter than the second ; 

 4 upper labials t to below the centre of the eye, the fourth the 

 longest ; subocular sharply keeled below the eye and forming an 

 angle wedged in between the fourth aud fifth upper labials, sometimes 

 nearly reaching the oral border. A strongly keeled upper temporal, 

 usually followed by a much smaller one ; temporal scales granular, 

 convex, upper very small, lower larger ; tympanic shield present ; 

 auricular denticulation absent or merely indicated. 



5 pairs of chin-shields, the three first in contact in the middle. 



* A small shield between them in two males and in thi-ee young, 

 t Rarely 5 according to Boettger. 



