112. aTRactts. 299 
2. Dirosema omiltemanum. 
Geophis omiltemana, Giinth. Biol. C.-Am., Rept. p. 92, pl. xxxiii. 
fig. A (1893). 
Snout broad, rounded. Rostral a little broader than deep, visible 
from above; internasals much broader than long, about two fifths 
the length of the prefrontals ; frontal broader than long, as long as 
or slightly longer than its distance from the end of the snout, much 
shorter than the parietals ; nostril between two rather large nasals ; 
loreal at least twice as long as deep; a small subocular may be 
present between the loreal and the third and fourth labials; two 
postoculars ; temporals 1+ 2; six upper labials, fourth or third and 
fourth entering the eye, sixth very long; two pairs of chin-shields, 
the anterior a little the longer and in contact with four lower labials. 
Scales in 17 rows, dorsals faintly keeled. Ventrals 150-166; anal 
entire ; subcaudals 38-51. Black, with whitish cross bars widening 
towards the belly, which is white; these bars less distinct and 
closer together on the posterior part of the body; upper lip white ; 
subcaudals.brown or speckled with brown. 
Total length 305 millim.; tail 65. 
Mexico. 
a-c. d (V. 150; C. 51) & Omilteme, Guerrero. Mr. H. H. Smith[C.]; 
her. ( V. 166, 156; C. 38, F. D. Godman, 
50). Ksq.[P.]. (Types.) 
3. Dirosema psephotum. 
Catostoma psephotum, Cope, Journ. Ac. Philad. (2) viii. 1876, p. 146. 
Elapoidis psephotus, Cope, Proc. Amer. Philos. Soc. xxii. 1885, p. 886. 
Geophis psephota, Giiinth. Biol. C.-Am., Rept. p. 94 (1893). 
Nasal undivided; two postoculars; temporals 1+4+2; six upper 
labials, third and fourth epteritftg, the eye, sixth longest; two pairs 
of cine shields, pesiseieas short. Scales keeled, in 17 rows. Ventrals 
Above uniform black; below 
an occasional ventral shield red, 
teak with the half or less 
forming a tessellated pattern. 
Total length 480 millim.; tail 128. 
Costa Rica. 
4. Dirosema brachycephalum. 
Colobognathus brachycephalus, Cope, Proc. Ac. Philad. 1871, p. 211. 
Catostoma brachycephalum, Cope, Journ. Ac. Philad. (2) viii. 1876, 
p. 147. 
Elapoidis brachycephalus, Cope, Bull. U.S. Nat. Mus. no. 82, 1887, 
p. 85 
One postocular ; six upper labials, third and fourth entering the 
eye, fifth in contact with the parietal. Scales in 15 rows, with a 
faint trace of carination near the posterior part of the body. 
Ventrals 124; anal enta¥e}\subcaudals 38. Black above, with a 
yellowish eallen anda llowish lateral streak; ventrals reddish, 
brown-margined. 
Total length 200 millim. 
Costa Rica. re 
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