Jordan and Evermann. Fishes of North America. 335 



558. TETRAGONOPTERUS PETENENSIS, Giinther. 



Head 4 ; depth 3 ; eye 3i in head. D. 11 ; A. 27; scales 7-37-7. Snout 

 rather compressed; upper profile of head scarcely concave; maxillary to 

 front of eye; dorsal inserted very slightly behind ventrals ; pectorals not 

 reaching ventrals. A silvery lateral baud ending in an oblong black 

 caudal spot. Lake Peten to western Ecuador, southeast to Argentina 

 Republic. (Giinther.) 



Tetragonopterus petetiensis, GUNTHER, Cat., v, 326, 1864, Lake Peten. (Coll. Salrin.) 

 559. TETRAGONOPTERUS SCABRIPINNIS, Jenyns. 



Head 3i ; depth 3. D. 10 ; A. 25 to 28 ; scales 6-37-5. Upper profile 

 scarcely concave ; maxillary to beyond front of eye ; pectoral extending 

 beyond base of ventrals ; humeral and caudal spots present, united by a 

 silvery band. (Giinther.) Jamapa, Mexico to Rio Janeiro, (scaber, 

 rough j pinna, fin, the males having, as in humilis, brevoortii, etc., some of 

 the fin rays roughened.) 



Tetragonopterus scabripinnis, JENYNS, Zool. Beagle, Fishes, 125, 1842, Rio Janeiro. (Coll. Dar- 

 win.) GUNTHER, Cat., v, 325, 1864. 



560. TETRAGONOPTERUS HUMILIS, Gunther. 



Head 4| ; depth 3i ; eye 3f. D. 11 ; A. 27 to 31 ; V. 8 ; scales 7-36-7. 

 Upper profile of head straight; maxillary to front of orbit; dorsal 

 inserted behind ventrals ; pectoral about to ventrals. Humeral and cau- 

 dal spots more or less distinct; sides silvery; anal and ventrals with 

 broad, red margins. Lake Amatitlan, Guatemala. (Gunther.) (humilis, 

 humble.) 



Tetragonopterus humilis, GUNTHER, Cat., v, 327, 1864, Lake Amatitlan, Guatemala. (Coll. 

 Salvin.) 



561. TETRAGONOPTERUS BREVIMANUS, Gunther. I 



Head 3i; depth 3. D. 11; A. 22; scales 6-38-5. Snout short and thick; 

 eye about 4 in head ; upper profile of head not concave ; maxillary extend- 

 ing to beyond front of eye. Dorsal inserted just behind ventrals ; pec- 

 torals not reaching ventrals ; caudal spot usual. Guatemala. (Gunther.) 

 (brevis, short; manus, hand.) 



Tetragonopterus brevimanus, GUNTHER, Cat., v, 325, 1864, Yzabal; Rio San Geronimo, Gua- 

 temala. (Coll. Godman & Salvin.) 



562. TETRAGONOPTERUS MEXICANUS, Filippi. 



Head 4; depth 2f ; eye 3. D. 10 or 11; A. 21 to 23; scales 7-39-5. 

 Snout bluntly rounded, projecting beyond the mouth ; forehead trans- 

 versely convex; maxillary to beyond front of eye; pectoral about to ven- 

 trals, as usual a little longest in males. Sides with the usual silvery 

 band, ending in an oblong black caudal spot. Lakes about the City of 

 Mexico. (Steindachner.) 



Tetragonopterus mexicanws, FILIPPI, in Guerin's Kev. Mag. Zool., 1853, 166, City of Mexico; 

 STEINDACHNER, Ichthyol. Notizen, vn, 11, 1868. 



