28 MK. G. A. BOULENGEE ON FISHES 



24. EuANEAius NiGRiPiNNis. (Plate IV. fig. 2.) 

 Euanemus nigripinnis, Boulenger, P. Z. S. 1895, p. 524. 



Depth of body equal to length of hetid, 4^ to 5 times in total length ; width of head 

 equal to length without snout ; groove extending from end of snout to occipital bone ; 

 eye as long as snout, 3| times in length of head, half interorbital width; maxillary 

 barbel extending nearly to end of pectoral spine, mandibular barbels to a little beyond 

 base of pectoral spine. Humeral process covered with skin, J length of pectoral 

 spine. Dorsal I 6 ; spine serrated behind, as long as head. Pectoral spine a little 

 shorter than head. Ventral as long as pectoral, reaching a Kttle beyond origin of 

 anal. Anal 36-37. Caudal deeply notched. Upper surface of head, back, and a 

 lateral stripe dark grey, rest white ; pectorals and ventrals deep black, white at the 

 base ; caudal black at the base. 



Total length 190 millim. 



roiir specimens from Paraguay. 



25. AUCHENIPTERUS GALEATUS, L. 



Matto Grosso. 



26. Tkachelyopterus coriaceus, C. & V. 

 Descalvados, Matto Grosso. 



27. Doras costatus, L. 

 Descalvados, Matto Grosso. 



28. Doras mauulatus, Val. 

 Paraguay. 



29. Doras weddelii, Cast. 

 Paraguay. 



30. OxYDORAS eigenmanni. (Plate IV. iig. 3.) 

 Oxydoras eiyenmanni, Boulenger^ P. Z. S. 1895, p. 524. 



Both jaws with small teeth. Depth of body equal to length of head, 4 times in 

 total length. Posterior nostril nearer the eye than to the anterior nostril. Diameter 

 of eye 4 times in length of head, 1^ in interorbital width, If in length of snout; 

 bases of the six barbels united by the fold of the lower jaw ; maxillaiy barbels 

 branched, extending a little beyond base of pectoral spine, twice as long as man- 

 dibulars. Gill-cleft extending to below posterior border of eye. Humeral process 



