,„^ Vol. VII, FP. 55-59 July 30, 1920 PROCEEDINGS OF THE NEW ENGLAND ZOOLOGICAL CLUB NOTES ON TWO PACIFIC COAST AMBYSTOMIDAE BY EMMETT REID DUNN In the course of work on the Pleihodontidae certain facts re-garding the Amhystomidae have come to light, and they are here offered. . /-r. /-« i I am able to support Van Denburgh's contention (Proc. Cal. Acad. Sci., (4), VI, p. 221) that Ambystoma ienebrosum Bd. and Gir and Triicm ensaius Eschscholtz (Zool. Atlas, V, p. 6, pi. 22, 1833) are the same species. A skull of ienebrosum, compared with the figure in the Zoologisches Atlas, shows a remarkable similarity even in trivial details. The hyoids also are exactly aUke. Chondrotus Cope (Amer. Nat., 1887, p. 88) is a synonym of Dicamptodon Strauch (Mem. Acad. Sci., St. Petersbourg, (7), XV 4, 1870), as A. tenehromm was the type species of Chon-drotus. . . • i ++1 It would reqmre a great deal more investigation to settle finally the status of the generic relationship of Amhysioma, Dicamptodon, and Linguelapsus. The hyoids of A. ensatum, however, differ markedly from those of A. maculatum, A. opa-cum and A. i2ffnnwm,aU of which are quite ahke. The larvae of our eastern species have a fin-fold on the back as far as the head. This is absent in ensatum larvae.
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