334 Bulletin ^j, United States National Museum. 



blackish caudal spot. (Giinther.) Oaxacu, Mexico, and Jiio Chagres, 

 south to Brazil, {wneus, brassy.) 



Telragnnoptents lenetis, Gunther, Proc. Zool. Sue. Lond., 18G(), 319, Oaxaca, Mexico. (Coll. 

 Sallo.) GCnthek, Cat., v, 320, 18G4. 



554. TETRAGOXOPTERUS RUTILUS, Jeuyus. 



Head 4^ ; depth 2| ; eye 31 iu head. D. 11 ; A. 25 to 29 ; scales 6-37-6; 

 upper profile little concave; maxillary reachiug beyond front of ventrals; 

 dorsal inserted just behind root of ventrals: pectorals reaching ventrals. 

 Silvery, -with an indistinct round dark spot behind shoulder; generally 

 a band-like blackish spot on root of caudal; sometimes extending as a 

 dark band to humeral spot; this band sometimes silvery; sometimes both 

 band and spots absent. Mexico to Ecuador and Rio de la Plata, recorded 

 as common in Central America. (Rio Chisoy, Rio Guacalate, Huamuchal, 

 Cordova, etc.) (RiUilus, the roach, from rutilus, ruddy.) 



TetrtKiouoplenm rittihis, .Jenvns, Zoiil. Beagle, Fish., 12.''>, 18-12, Rio Parana. (Cull. Darwiu). 



EroENMANN, I'roc. U. S. Nat. Mug., 1891, 52. 

 Telnigouoplerm Iteiaaliis, Jenyns, /. c, 12G, 1842, Rio Janeiro. (Coll. Darwiu.) 

 Telraijonoplems fiiscoaxircdtis, Castelnau, Anini. Amer. Sud; Poiss., GO, pi. 3:i, fig. 2, 1855, Bahia. 

 Tetragonoplt;rus vikrosloma, Gi'NTHEn, Cat., v, 323, 18G4, Bahia. (Coll. Dr. Wucherer.) 

 Tdraijonopierns fasfiahis, Gunther, Cat., v, 322, 1864, (not of CuvierA Valenciennes). 



555. TETRAGONOPTERUS PANAMENSIS, Giinther. 



Head 31; depth 2i; eye 3i in head. D. 11; A. 28; scales 8-36-7. Simi- 

 lar to T. rutilu/i, but with more scales in a transverse series. Maxillary to 

 front of eye ; pectorals reaching a little beyond ventral base. Humeral 

 and caudal spots present, united by a silvery band. (Giinther.) Streams 

 about Panama and Lake Yzabal ; locally abundant. 



Telnigonopterm paiHxmeiisix, Gunther, Cat., v, 324, 1S04, Panama; Yzabal. (Coll. Godman & 



Salviu.) 

 Tetmijnuiipli'riisjisclieri, Steindachner, Flussfiscbe SUdanierikas, i, 1G7, 1879, Mamoni River at 



Chepo, Colombia. 



556. TETRAGONOPTERUS MICROPHTHALMUS, Gunther. 



Headli; depth 2f ; eye about 4 in head. D. 11; A. 26 to 29; scales 

 7-36-8. Sinular to T. rutilus, but the pectoral fin shorter, not reaching 

 base of ventral. Maxillary reaching front of eye. Silvery, with a band- 

 like spot at root of caudal ; usually a silvery lateral band. Guatemala, 

 (Lake Amatitlan), to Peru. (Giinther.) {/iiKpuq, small; oqjOaAiihc, eye.) 



Telrngonopierns microphihalmtts, Gunther, Cat., v, 324, 1804, Lake Amatitlan ; Rio Rimac, 

 Peru. (Coll. Salvin.) 



557. TETRAGOXOPTERUS U-^RSTEDII, Kriiyer. 



Head 4 ; depth 3 ; eye 3 in head. D. 11 ; A. 29 to 31 ; scales 7-37-8. 

 Mouth moderate, the maxillary about to front of eye ; pectorals about to 

 ventrals. Humeral and caudal spots present, connected by a faint silvery 

 band. Rio San Juan, Nicaragua. (Liitken.) (Named for Professor A. S. 

 Orsted of Copenhagen.) 



Tctragonnplcrus wrstedii, Kboyer, MS., LuTKEN, let. Bidrag, in, 229, 1874, Rio San Juan, Nica- 

 ragua. 



