THREE NEW CORYDORAS SPECIES FROM FRENCH GUIANA AND BRAZIL (PISCES, SILURIFORMES, CALLICHTHYIDAE) by H. NIJSSEN and I. J. H. ISBRÜCKER (Institute of TaxonomicZoology, University of Amsterdam,The Netherlands) SUMMARY Three new species of South American plated catfishes of the genus CorydorasLace- pède, 1803 are described and figured: Corydorascondiscipulus n. sp. from Fleuve Oyapock, border river between French Guiana and Brazil (= Rio Oiapoque), C. narcissus n. sp., and C. robustus n. sp., both from a tributary creek of the Rio Ipixuna, Rio Purus system, Est. Amazonas, Brazil. The occurrence of C. oiapoquensis Nijssen, 1972, C. amapaensisNijssen, 1972, and C. condiscipulusin French Guiana and Brazil is recorded. INTRODUCTION The three Corydoras species herein described as new were found while examining specimens from various sources. Measurements and meristic data are taken following the same methods as described for the species of the genus Aspidoras (NIJSSEN & ISBRTCKER, 1976: 108). In the de- scriptions and discussions of the species, figures are proportional in comparison with standard length (sl) or head length (hl). The morpho- metric data for the holotype are given first in millimetres, followed by proportions in parentheses. DESCRIPTIONS OF THE SPECIES S Corydoras condiscipulus n. sp. (Figs 1, 4b, 5) Material examined.- All specimens were collected in the Oyapock river system. Holotype: IRScNB 617 (ex IRScNB 492, a paratype of Corydoras oiapoquensis, illustrated by NijSSEN, 1972: 427, top fig. 7), sl 41.5 mm, French Guiana, Cumuri Creek at left bank of Oyapock River, up- stream of first rapids of Grande Roche, southwest of village Oiapoque 495 (Brazil, Est. Amapa, 03°54' N, 51°46' W), coll. J. P. Gosse, 5-XII- 1962. Paratypes: 2, IRScNB 492, 2, ZMA 110.590 (paratypes of C. oiapoquensis), sl 33.1-46.2 mm, same data as the holotype; -1, IRScNB 494 (paratype of C. oiapoquensis), sl 33.4 mm, French Guiana, Alikene Creek at left bank of Camopi River, coll. J. P. Gosse, 1-XII-1969; - 15, IRScNB 497; 6, ZMA 110.594; 2, USNM 205869 (paratypes of C. oiapoquensis), sl 32.5-54.4 mm, Brazil, Est. Amapa, Adjoumba Creek at right bank of Oyapock River between villages Camopi and Sikini, coll. J. P. Gosse, 6-XII-1969; -2, MNHN 1979-540; 1, ZMA 115.332, sl 39.1-40.3 mm, French Guiana, Crique Sacarangue, coll. F. d'Aubenton, 20-X-1976; -1, MNHN 1979-539; 1, ZMA 115.333, sl 43-50 mm, French Guiana, Rapides Trois Sauts, Taitetu Ipala, coll. F. d'Aubenton, 28-IX-1976; -1, MNHN 1979-542; 1, ZMA 115.334, sl 37.9-47.8 mm, French Guiana, Crique Euleupousing, coll. F. d'Aubenton, 6-X-1976; -2, MNHN 1979-543; 2, ZMA 115.355, sl 39.5-48.2 mm, Brazil, Est. Amapa, Lower course of Rio Oiapoque, track 60 km from village Martinique, coll. F. d'Aubenton, 9-XI-1976; - 1, MNHN 1979-541, sl 38.7 mm, French Guiana, Gabaret Creek (north of St. Georges) at village Codi, coll. F. d'Aubenton, 14-XI- 1976 ; -1, MNHN 1979-544, sl 48.6 mm, French Guiana, Pakoti Creek, coll. Grenant, ll-IX-1976. Fig. 1. Corydorascondiscipulus n. sp., holotype. Description.-Holotype, sl 41.5 mm; bd 16.1 mm (2.6); bw 10.1 mm (4.1); Ids 9.3 mm (4.5); Ips 11.3 mm (3.7); hl 14.8 mm (2.8); sn 8.2 mm (1.8); lbo 4.6 mm (3.2); wi 5.9 mm (2.5); ca 5.3 mm (2.8); dcp 5.9 mm (2.5); fontanel 4.7 mm long; Pz 1,9; dbs/vbs .