DEC. 28, 1916. FISHES OF PANAMA MEEK AND HILDEBRAND. 289 



27. Genus Creagrutus Gunther. 



Creagrutus Gunther, Cat. Fish. Brit. Mus., V, 1864, 339 (type Leporinus 



mulleri Gunther). 



Body elongate, not strongly compressed; abdomen rounded; head 

 rather low; second suborbital large, covering nearly the entire cheek; 

 premaxillary teeth in 3 series; maxillary with from i to 4 teeth; mandible 

 with a single series of teeth, the anterior ones enlarged; gill-membranes 

 free from the isthmus; lateral line complete; anal fin short, of not more 

 than 17 rays. Species small. 



KEY TO THE SPECIES. 



a. Depth of body 3.6 to 4.3; upper jaw little projecting; none of the 

 premaxillary teeth exposed when mouth is closed; n or 12 gill- 

 rakers on lower limb of first arch. notropoides, p. 289. 



aa. Depth of body 3.1 to 3.7; upper jaw strongly projecting; most 

 of the first series of premaxillary teeth exposed when mouth is 

 closed; 7 to 9 gill-rakers on lower limb of first arch, simus, p. 290. 



36. Creagrutus notropoides Meek & Hildebrand. 



Astyanax mexicanus (non Filippi) Evermann & Goldsborough, Proc. 



Biol. Soc. Wash., XXIII, 1910, 4 (Canal Zone, Panama). 

 Creagrutus notropoides Meek & Hildebrand, Field Mus. Nat. Hist. Pub., 



Zool. Ser., X, 1912, 68 (Rio Indio, upper tributary of Rio Chagres). 

 Creagrutus affinis (in part) Eigenmann, Indiana Univ. Studies, No. 18, 



1913, 7 (Rio Chagres; Puerto Negria; Istmina; Boca de Raspadura). 



Head 3.6 to 3.95 ; depth 3.6 to 4.3 ; D. 10; A. 14 to 16 ; scales 5- 34 to 38-4. 



Body elongate, not strongly compressed anteriorly; caudal peduncle 

 rather strongly compressed, its depth 2.1 to 2.5 in head; dorsal region 

 little elevated; head low, rather wide; snout blunt 3.65 to 4.6 in head; 

 eye 2.6 to 3; interorbital 2.8 to 3.25; mouth small; upper jaw but little 

 in advance of the lower; maxillary-premaxillary border rather 

 strongly curved; maxillary reaching anterior margin of pupil; premaxil- 

 lary teeth all covered by the lower lip when mouth is closed, the series 

 irregular; maxillary with 3 or 4 small teeth; lower jaw with 8 large teeth 

 anteriorly and about 4 smaller ones at each side; teeth in the young 

 pointed or cricuspid, very blunt or even paved in adult; gill-rakers 

 moderate, n or 12 on lower limb of first arch; scales striate, 8 or 9 

 before dorsal, 9 or 10 between dorsal and adipose; 9 or 10 longitudinal 

 rows between base of dorsal and base of anal; origin of dorsal over base 

 of ventrals, midway between tip of snout and tip of adipose, or slightly 

 nearer the latter; adipose fin well developed, just behind vertical from 



