184. HOMAIOCKANITIM. 223 



13. Homalocranium virgatnm. 



Microdromus virgatus, Ounih. Ann. ^ Mag. N. H. (4) ix. 1872, 



p. 17, pi. iv. fig. B. 

 Homalocranium sexfasciatum, Fischer, Abh. Nat, Ver. Bremen, vii. 



1882, p. 225, pi. xiv. figs. 8-10. 

 virgatum, Bocourt, Miss. Se. Mex., Bept. p. 584, pi. xxxvi. fig. 4 



(1883) ; Gunth. Biol. C.-Am., Bept. p. 154, pi. lii. fig. A (1895). : 

 TantiUa sexfasciata, Cope, Bull. U.S. Nat. Mus. no. 32, 1887, p. 83. 

 -virgata, Cope, I. c. p. 84. 



Eye about half the length of the snout. Eostral a little broader 

 than deep, visible from above ; internasals about half as long as the 

 praefrontals ; frontal hexagonal, obtuse-angled in front, acute- 

 angled behind, once and one third to once and a half as long as 

 broad, longer than its distance from the end of the snout, shorter 

 than the parietals ; nostril in a single or divided nasal, which is in 

 contact with or narrowly separated from the praeocular ; two post- 

 oculars ; temporals 1 -|- 1 ; seven upper labials, third and fourth 

 entering the eye ; first lower labial separated from or narrowly in 

 contact with its fellow, the symphysial usually reaching the 

 anterior chin-shields ; four lower labials in contact with the anterior 

 chin-shields, which are longer than the posterior. Scales in 

 15 rows. Ventrals 154-175 ; anal divided ; suboaudals 57-65. 

 Pale brown above, with four darker stripes edged with blackish ; a 

 blackish line along each side of the belly ; a yeUow, black-edged 

 cross-bar on the occiput, interrupted in the middle ; upper lip and 

 end of snout yellowish, with a black spot below the eye and another 

 on the rostral shield ; lower parts yellowish white. 



Total length 315 millim. ; tail 75. 



Costa Eica. 



a^d. S (V. 154 ; 0. 57) & 2 Oartago, Costa Rica. (Types.) 



(V. 173, 175, 167 ;0.?, 63, 59). 



14. Homalocranium ruficeps. 



Pogonaspis ruflceps, Cope, Proc. Ac. PhUad. 1894, p. 204. 



Rostral visible from above ; frontal elongate, hexagonal ; nostril 

 between two nasals, the posterior not reaching the praeocular ; two 

 postoculars ; temporals 1 -(- 1 ; seven upper labials, third and fourth 

 entering the eye ; first lower labial in contact with its fellow 

 behind the symphysial ; a single pair of chin-shields, in contact 

 with four lower labials. Ventrals 146; anal divided. Light 

 brown above ; median row of scales deep brown ; a narrow yellow 

 line on the adjacent borders of the third and fourth rows of scales, 

 which is bounded above by a dark brown line ; upper surface of 

 head light reddish brown, with a pale spot at the extremity of each 

 parietal shield ; upper lip yellow, with a black spot below the eye ; 

 lower parts yellow. 



Total length 223 millim. 



Costa Eica. 



