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Show 1 9 0 5 .] DR. A. DUGfiS ON A NEW MEXICAN SNAKE. 5 1 7 from Ishigaki and one from Iriomote. The scales behind the neck were 24 in one specimen, round mid-body 29 in one specimen and 33 in the others. The ventrals were 336, 316, and 332. 3. D ist ir a o r n a t a .- The three specimens were all from Okinawa. The scales behind the neck were 29, 32, and 33 ; midbody 35, 37, and 38. Yentrals 271, 268, and 251. 4. A ipy su ru s a n n u l a t u s .-All the six examples were from Okinawa. Four had a sharp spine on the rostral which was absent on the other two. The prsefrontals were very irregular. There were four in three specimens, two in one specimen, and three (2 right, 1 left) in two specimens. In all one or both parietals were split by a suture behind. The scales were 17 in mid-body when the vertebral row was enlarged, which was usually the case, though often to a variable degree. In two specimens the scales were 19, the vertebrals being divided into three rows subequal to the other dorsals. Yentrals numbered 138 to 143. 5 . P laturus l a t ic a u d a t u s .-The two specimens were from Okinawa. The ventrals were 243 in one specimen; the last was divided in both specimens. 6. P laturus sch isto rh yn c i iu s .- Of 37 specimens, 29 were from Miyako, 6 from Okinawa, and 2 from Amami. All the specimens were preserved in formalin. 3. Description d'un Ophidien nouveau du Mexique (Morenoa orizabensis, g. et sp. nn>), Par A l f r e d D uges, M.D., C.M.Z.S. [Received July 7, 1905.] (Text-figure 77.) Ce Colubride (Sous-fam. Colubrince) ne m'est connu que par deux exemplaires provenant d'Orizaba (Etat de Yera-Cruz) d'ou me l'a envoye le Prof. Aniceto Moreno pour le determiner. Ne le trouvant decrit dans aucun des ouvrages (pie j 'ai pu consulter, j'ai du lui donner un nom generique et specifique nouveau et je le dedie a mon ami M. Moreno. Ses rapports les plus in times sont avec le g. Ablabes, tel que l'a compris Boulenger (Catal. Snakes of Brit. Mus. 1894); mais il en differe assez pour l'en separer, comme le prouve sa description. Les vertebres dorsales posterieures manquent d'hypapophyses. La dentition est isodonte : il m'a semble qu'il y avait une douzaine de dents au maxillaire superieur, mais je n'ai pu m'en assurer exactement pour ne pas trop mutiler l'exemplaire que je pouvais examiner. L'aspect general est celui d'une Coronella. Caracteres.-La rostrale se replie un peu sur le museau. Les internasales sont un peu plus petites que les prefrontales; celles-ci |