SIAPHOS 219 



rostral covering point of snout, the part visible above not longer 

 than its height; sutures with frontonasal not longer than those 

 with nasal ; frontonasal as wide as deep or wider, in contact with 

 one frenal laterally, forming its shortest suture with frontal, 

 its longest with prefrontals (in one specimen the frontal suture 

 is much widened, and the frenal suture is shorter) ; prefrontals 

 well developed, invariably separated, touching two frenals 

 laterally; frontal narrower than supraocular region, as long as 

 its distance to end of snout, narrowly truncate in front, much 

 narrowed behind; four supraoculars, first and fourth longest, 

 second widest; frontoparietal very large, single, a little broader 

 than long, much broader than frontal or supraocular region; 

 interparietal usually triangular, the parieta'ls forming a suture 

 behind it; three to five pairs of nuchals; nostril pierced in a 

 single nasal, followed by two frenals, anterior a little higher 

 than wide, posterior broader than anterior; two preoculars, 



Fig. 37, Siaphos infralineolatum (Gunther) ; a, head, dorsal view; b, head, lateral view; 



c, chin ; X 3. 



lower largest; nine to eleven superciliaries ; several enlarged 

 temporals, largest bordering parietal; six upper labials, fourth 

 and fifth under eye, fourth alone entering orbit ; two scales above 

 third labial, and a scale partially inserted between fourth and 

 fifth; five or six lower labials; mental little larger than rostral, 

 followed by a large undivided postmental ; this followed by three 

 pairs of chin shields, first pair in contact, second pair widest; 

 eye moderately large with a transparent disk on lower eyelid; 

 disk sometimes opaque; auricular opening wanting, its position 

 marked by a small depression covered with scales; sixteen to 

 twenty-two lamellse under fourth toe; limbs small, weak, touch- 

 ing when adpressed; preanals enlarged; twenty to twenty-two 

 rows of smooth scales around body, the median dorsals much 

 enlarged; ventral scales frequently irregular in size; scales not 

 widened under tail, except when regenerated. 



