PROC. BIOL. SOC. WASH. 94(1), 1981, pp. 67-75 A NEW POISON-DART FROG (ANURA: DENDROBATIDAE) FROM THE FOREST OF SOUTHEASTERN COLOMBIA William F. Pyburn Abstract. — Dendrobates myersi, a new species of poison-dart from from the Colombian rain forest, is related to members of the Dendrobates fe-moralis species group. The new frog is terrestrial, diurnal, and probably territorial. Its call is a long series of double-noted chirps given by isolated individuals. In captivity D. myersi is aggressive toward other dendrobatids. The larva and reproductive characteristics of the new species are unknown. Early in August 1972, near the Cacua Village of Wacara, I listened to the penetrating notes of a dendrobatid frog calling from the leaf litter of the forest floor. The call was a long series of double-noted chirps, unlike that of any frog I had heard before. I recorded the call with a Uher 4000 Report L tape recorder, and a Cacua Indian companion captured the brightly pat-terned frog where it sat at the base of a low shrub. The time was about one hour before sunset. Since that initial encounter, I have obtained six additional specimens of this unusual frog, one of which was sent alive to Charles Myers of the American Museum of Natural History. Analysis of the skin gland secretions, to be reported by Myers elsewhere, together with the color pattern and unusual, apparently territorial call, show that these seven specimens rep-resent an unnamed species of poison-dart frog. Dendrobates myersi, new species Fig. 1 Holotype. — UTA A-3989, adult male collected near Wacara (elev. 216 m, long. 69°53'W, lat. 1°08'N), Comisaria de Vaupes, Colombia, 2 Aug. 1972 by J. K. Salser, Jr., Vincente Lopez, Arquelao Gallego, and W. F. Pyburn. Paratypes. — UTA A-7634, juvenile collected at type-locality, 3 Aug. 1972 by J. K. Salser, Jr. and W. F. Pyburn; AMNH 104681, juvenile collected at type locality, 3 Aug. 1972 by J. K. Salser, Jr. and W. F. Pyburn; AMNH 102173 adult male (skinned carcass) obtained 21 April 1976 by Pyburn at Yapima (69°28'W, 1°03'N), Comisaria de Vaupes, Colombia; AMNH 104682, adult female obtained 5 Aug. 1974 by Nathan Waltz at Yapima; AMNH 104683, adult male obtained 2 Sept. 1975 by Nathan Waltz near
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