184, HOMALOCRANIUM. 223 
13. Homalocranium virgatum. : 
Microdromus virgatus, Giinth. Ann. § Mag. N. H. (4) ix. 1872, 
p- 17, pl. iv. fig. B 
Homalocranium sexfasciatum, Fischer, Abh. Nat. Ver. Bremen, vii. 
1882, p. 226, pl. xiv. figs. 8-10. 
—— virgatum, Bocourt, Miss. Sc. Mex., Rept. p. 584, pl. xxxvi. fig. 4 
(1883); Giinth. Biol. C.-Am., Rept. p. 164, pl. lii. fig. A (1895). : 
Tantilla sexfasciata, Cope, Bull. U.S. Nat. Mus. no, 32, 1887, p. 83. 
—— virgata, Cope, 1. c, p. 84. 
Eye about half the length of the snout. Rostral a little broader 
than deep, visible from above ; internasals about half as long as the 
prefrontals; 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 preocular ; two post- 
oculars; temporals 1+1; seven upper Jabials, 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; subcaudals 57-65. 
Pale brown above, with four darker stripes edged with blackish ; a 
blackish line along each side of the belly; a yellow, 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 Rica. 
a-d. g (V. 154; C. 57) & Cartago, Costa Rica. (Types.) 
(V. 1738, 175, 167; C. ?, 63, 59). 
14, Homalocranium ruficeps. 
Pogonaspis ruficeps, Cope, Proc. Ac. Philad. 1894, p. 204. 
Rostral visible from above ; frontal elongate, hexagonal ; nostril 
between two nasals, the posterior not reaching the preocular; two 
postoculars; temporals 14+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 Rica. 
