Paul De Benedict's 1960 Sept 4 Rhyacosivedon. 14.4 mi W (by Mex [5]) of the west border Mexico City, Mexico, Mex. (T. Papen fuss- M.A. Eucley collectors) #94 [illegible] Snout-vent 6.7cm, tail 6.5 cm. Dorsum dark olive, finely spotted with black [1], tail light, beneath and with coarser spots [2], head with finer spots. Venter pale olive, with a coarse network of black melanopores, which is often broken to form light spots [3], these spots largest ventro laterally and most numerous in the pectoral region. Iris dark olive like ground color.