432 A Revision of the Gurimatinm. 



Origin of dorsal little nearer to tip of snout than to tip of adipose. 

 Some of the anterior dorsal rays produced. Anal emarginate ; pectorals 

 not reaching ventrals. 



Air-bladder extending to anal. 



Iridescent brassy below, purplish and bluish lustre above; immaculate. 



Head 3^-3f ; depth l-i%-a. D. 13; A. 11; V. 9-10. Lat. 1. 86-'* 90.'* 



38. CURIMATUS IiATI€£PS. 



Curimatus laticeps Cuv. and Val. xxii., 21, pi. 634 (Lake Maracaibo) ; 

 Gthr., '64, 393 (copied); Steind., '81a, 37 (Rio Guapore ; Cujaba ; 

 Villa Bella ; Silva, Lake Saraca). 

 Curimatus altamazonicus Cope, '78a, 684 (Peruvian Amazon). 



Habitat, Amazons from Villa Bella to Peru ; Rio Guapore ; Lake 

 Maracaibo. 



Sixty specimens, .09-. 35 m. Coary ; Fonteboa ; Villa Bella ; Serpa. 



Compressed elongate, shape of C. latior ; head wider and flatter 

 above, upper profile somewhat steeper and more convex. Postventral 

 region compressed trenchant, but without carination ; preventral region 

 rounded. Median line before dorsal naked, at least in adult ; postdorsal 

 region rounded. Scales somewhat deciduous, very thin, crenate. 



Anterior profile somewhat concave. Eye 4 in head, 2^-2f in inter- 

 orbital. 



Origin of dorsal little nearer to tip of snout than to tip of adipose fin. 

 Dorsal truncate, or some of the anterior rays produced, as long as the 

 head. Anal emarginate. Pectorals about reaching to ventrals, ventrals 

 usually not to vent. 



Air-bladder reaching to near end of anal. 



Silvery on sides and below, bluish above. 



Head 3|-3i; depth 2|-3. D. 13; A. 15-17. Lat. 1. 94-110. 



Very similar to latior, but much less abundant. 



39. CURIMATUS LATIOR. 



Yulilla. 



Anodus latior Spix, '29a, 63, pi. 41 (Equatorial Brazil). 

 Curimatus latior C. and V. xxii., 19; Castelnau, '55a, 58 (Amazon); 

 Kner, '59a, 145 (Rio Negro; Guapore; Cujaba); Gthr., '64, 393 

 (copied); Steind., '81a, 36 (Rio Negro; Teffe; Serpa; Jatuarana); 

 id. '83a, 13 (Huallaga). 

 Habitat, Amazons and tributaries from Serpa to Huallaga; Surinam. 

 About two hundred and fifty specimens, .10-. 33 m. Manacapuru; 

 Hyavary; Hyanuary; Coary; Lago Alexo; Tabatinga ; Obidos; Rio 

 Negro; Sao Paolo; Teffe; Serpa. 



Compressed elongate. Entire ventral region trenchant, but without 

 carination. Median line before dorsal naked in adult, covered with 



