Vol. XXIX, pp. 93-94 June 6, 1916 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON A NEW TANTILLA FROM MEXICO. BY THOMAS BARBOUR. When Stejneger described Tantilla vnlcoxi (Proc. U. S. Nat. Mus., 25, 1902, p. 156) he closed his notice with the words: "It would then be interesting to know what is Garman's T, coronata from San Luis Potosi." The specimen mentioned by Garman (Bull. Essex Inst., 19, 1887, p. 128) is now before me, and I believe represents a new form, near T. vnlcoxi Stejneger, and also close to T. bocourti Giinther, which unfortu-nately I have not seen, and which was very inadequately de-scribed. I imagine that this form may be an intermediate type, perhaps annectant between these two species. I naturally have submitted our specimen to Stejneger for comparison with the type of T. wilcoxi, and he writes me as follows, under date of March 28, 1916: "I have looked at your Tantilla and compared it with the type of T. wilcoxi. The eye is smaller, thongh larger than in T, coronata. Top of head very similar, though supraoculars smaller, corresponding to eyes, head not so broad over temples. Color pattern practically identical. But then your specimen is smaller than the type. However, your speci-men has first pair of lower labials broadly in contact behind mental as in T. bocourti, while in T. toilcoxi, they are separated by mental." Giinther, however, in describing T. bocourti (Biol. Cent., Am., Kept., 1894, p. 149) begins by saying of his species: "Vertical (= frontal) shield moderately broad, considerably longer than broad, much broader than the supraocular." This is not the condition in the example in hand, in which it is more than moderately broad. Unfortunately Giinther makes no mention whatever of the size of the eye. T. bocourti Giinther was collected by the veteran Duges at Guanajuato. Pending 21— Proc. Biol. Soc. Wash., Vol. XXIX, 1916. (93)
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