Edentulous Genera of Ciirimatime. 419 



postventral region with median and lateral keels which converge to- 

 wards the anal. Predorsal region broad, with indistinct median and 

 lateral keels; postdorsal region rounded or with three keels. 



Scales persistent, crenate or serrate margined; lateral scales with two 

 or three diverging ridges. Caudal lobes scaled to the tip in all speci- 

 mens. 



Profile scarcely depressed over the eyes. Eye 3^3^ in head, 1^-3 in 

 interorbital. 



Air-bladder extending to the anal. 



Origin of dorsal about equidistant from tip of snout and tip of adi- 

 pose. Highest dorsal ray little longer or shorter than head. Anal 

 emarginate, the tips of some of the anterior rays reaching the caudal. 

 Ventrals considerably shorter than head, not reaching the vent. 



Scales above the lateral line usually with a golden base and a cres- 

 centiform dark spot parallel with the margin, remaining parts golden. 

 Sometimes uniform steel blue, without markings. 



Head 3|-3^; depth 2^-3. D. 12-13; A. 10-11. Scales 5-36 to 38-5. 



4a. CURIMATUS ALBURN (IS LINEATUS. var. nov. 



Type, No. 20,297, one specimen, .09 m. Jutahy; James, Thayer, and 

 Talisman. 



Color of alburnus, but the dorsal scales with a blackish median 

 line. 



Depth 2f. D. 13; A. 10-11. Lat. 1. 33-35. 



5. CURIIWIATUS SPIIiURXJS. 



Curimatus spilurus Gthr., '64, 288 (Essequibo); Steind., '76a, 31 

 (Hyanuary; lya; Teffe; Rio Negro); Cope, '78a, 684 (Peruvian Ama- 

 zon); Steind., '79a, 5 (Orinoco near Ciudad Bolivar). 



Habitat, Northern Brazil and northward. 



About two hundred specimens, .045-12 m. 19a; Teffe; Jutahy; Cuda- 

 jas; Jose Fernandez; Lake Hyanuary; Alexo; Ueranduba; Jatuarana; 

 Obidos. 



Compressed elongate. Preventral region flattened, with a median 

 series of large scales; postventral surface rounded, the large scales of 

 the median series slightly carinate. Predorsal region depressed or 

 grooved to near the dorsal; postdorsal region rounded. 



Scales perfectly smooth-edged in the smaller examples, slightly den- 

 tate in the largest specimens. Lateral line complete. Scales only on 

 the base of the caudal lobes. Lateral scales with two longitudinal 

 ridges. 



Profile from nares to near dorsal straight and not very steep. Eye 3^ 

 in head, H-l^ in the interorbital. 



Air-bladder extending to the anal. 



