457 
margin. It is common at Dueias,where several specimens were brought 
to me by the Indians. I also obtained two examples at Lanquin. 
It seems to be generally distributed. If at some future period more 
stress is laid on the character of coloration, this species will form the 
type of a separate genus, as the other species constituting the genus 
Dromicus exhibit a very decided tendency to longitudinal bands. 
AHZTULLA MEXICANA. 
Leptophis mexicana, Dum. et Bibr. vii. p. 53. 
Ahetulla mexicana, Ginther. 
One specimen from Lanquin. This is a very beautiful species 
wheu fresh, the upper part being deep bluish-green. 
LEPTODEIRA ANNULATA. 
Coluber annulatus, Linn. 
Leptodeira annulata, Fitzinger, Syst. Rept. p. 27. 
One specimen (scales in twenty-three rows), killed in the thatch 
of a rancho near Dueiias. 
Dipsas CeNcuHOA, Linn. 
Coluber cenchoa, Linn. 
Dipsas cenchoa, Neuwied. 
One specimen, a small one, from Coban, brought by an Indian 
boy. 
DIpsADOMORPHUS BISCUTATUS. 
Dipsas biscutata, Dum. et Bibr. p. 1153. 
Dipsadomorphus biscutatus, Ginther. 
I picked up a dead example (a very large one) of this snake on 
the road between Coban and Langnin. It had probably been killed 
and thrown there by an Indian. There were previously only three 
specimens known, one having been brought lately by M. Sallé from 
Oaxaca, which is now in the collection of the British Museum. The 
present specimen measures at least 33 feet. 
ELAPS CORALLINUS. 
I obtained from the Indians two specimens of Zaps from Dueiias, 
one of which seems to agree most nearly with 2. fetzingeri, Jan., the 
other with EZ. nigrocinctus, Girard. The former of these has twenty- 
seven rings on the trunk and six on the tail. The number of ven- 
tral plates is 224, of the caudal 37. The black rings are placed at 
regular intervals. Each ring is narrowly edged with yellow, and the 
intervals between the rings filled in on the upper surface with dull 
red, which is darkest on the vertebrae, and gradually becomes lighter 
towards the flanks. The first ring on the neck commences anteriorly 
just within the occipital shields. Each black ring occupies a series 
of six scales. The spaces between the black rings occupy nine series 
of scales. 
