DEC. 28,1916. FISHES OF PANAMA MEEK AND HILDEBRAND. 291 



Color silvery; sides with a plumbeous lateral band; a distinct 

 shoulder spot present; no caudal spot; fins unmarked. 



The present collection contains over 400 specimens of this species, 

 ranging in length from 30 to 70 mm. All are from the Rio Tuyra Basin. 

 Inhabiting upland streams where the current is swift. 



This species is evidently very closely related to C. affinis Stein- 

 dachner, from which it, however, differs in having i or 2 more longi- 

 tudinal rows of scales between the base of dorsal and base of anal. 



Habitat: Rio Tuyra Basin, Panama. 



28. Genus Roeboides Giinther. 

 ANCHOVATA OR ANCHOBETA. 



Rceboides Gunther, Cat. Fish. Brit. Mus., V, 1864, 347 (type Anacyrtus 



microlepis Reinhardt). 



Body elongate, ventral region rounded; teeth mostly pointed, in 2 

 or more series, present on maxillary, premaxillaries and mandible; gill- 

 openings wide, the membranes separate, free from the isthmus; gill- 

 rakers slender; shoulder girdle with a large spine; lateral line straight, 

 complete; anal fin very long; adipose fin well developed. 



KEY TO THE SPECIES. 



a. Scales in lateral line 82 to 89, rarely with 80 or 81; gill-rakers 

 short, 8 or 9 on lower limb of first arch; origin of dorsal notably 

 nearer tip of snout than base of caudal; origin of anal nearer tip 

 of snout than base of last ray of anal; no black blotch behind the 

 obscure spot at upper angle of gill-opening; a black longitudinal 

 bar in lateral band under base of dorsal usually present. 



guatemalensis, p. 291. 



aa. Scales in lateral line 72 to 80; gill-rakers longer, 10 to n on lower 

 limb of first arch; origin of dorsal about midway between tip of 

 snout and base of caudal; origin of anal midway between tip of 

 snout and base of last anal ray; a large black blotch an eye's 

 diameter behind the obscure spot at upper angle of gill-opening. 



occidentalis sp. nov., p. 293. 



38. Roeboides guatemalensis (Gunther). 



Anacyrtus (Rceboides) guatemalensis Gunther, Cat. Fish. Brit. Mus., V, 



1864, 347 (Rio Chagres; Huamuchal; Lake Nicaragua); Vaillant, 



Bull. Mus. d'Hist. Nat., 1897, 221 (Rio Chagres). 

 Cynopotamus guatemalensis Garman, Bull. Essex Inst., XII, 1890, 13 



(Rio Chagres). 



