New species of Pseudothelphusa from the Venezuelan Andes (Crustacea Brachyura, Potamonidae)

During a collecting trip in the Venezuelan Andes three species of fresh water crabs were obtained. One of these is here described as a new species, a second as a new subspecies of an already described species. In these descriptions the abbreviations cb. and cl. have been used for "carapace breadth" and "carapace length", respectively. The material is deposited in the Museum of Biology of the Central University of Venezuela, Caracas (MB). I am greatly indebted to Mr. Andrés Eloy Esteves for his assistance during the field work as well as for the photographs that illustrate this paper. Pseudothelphusa holthuisi new species Description. — The upper border of the front is marked by an ill-defined ridge that does not possess a row of distinct tubercles. In dorsal view it is convex and in frontal view it is concave. The lower frontal ridge is marginate, almost straight and lies in front of the upper border. The carapace is convex in both directions, however, the gastric region is more elevated than the branchial and thus the outline of the carapace in frontal view is not a regular arch. The postfrontal lobes are almost absent, except for a small swelling and a shallow depression in front of these. The carapace between these shallow depressions and the front is inclined towards the front. The median groove is absent. The cervical groove is sinuous, very deep and wide proximally, reaching almost to the anterolateral border of the carapace. There is a shallow notch just behind the orbit. Between this notch and the termination of the cervical groove there are approximately 5 small teeth. Behind the termination of the cervical groove the anterolateral border is divided into approximately 15 small acute teeth. The upper surface of the