466 CALIFORNIA ACADEMY OF SCIENCES. 



dd. Body without longitudinal bands; dorsal plain. D. I, 7; A. I, 6; 

 P. I, 7-8; V. 6. 



/. Head and dorsal plates deep bronze; ventral plates yellowish; all 

 the fins immaculate, opercle, humeral and nuchal plates irrides- 

 cent blue; base of the dorsal fin shorter than the distance between 

 the dorsal and adipose; depth less than 4- of the total length; eye 

 4| in the head, more than two in the interorbital. (Gill.) 



ceneus 460. 



ff. Olive, the nine or ten anterior scutes with vertical series of 

 blackish spots; base of the dorsal fin equal to the space between 

 the dorsal and adipose fins; depth 3 in the total length; eye 

 about 3 in the head; spines of the fins very strong and long, dor- 

 sal spine as high as the body, pectoral spine shorter; 4-5 azygous 

 shields. (Giinther.) armatus 461. 



cc. Caudal fin with 4-5 dark vertical bars; dorsal with dark markings. 

 g. Dorsal fin with 2 irregular cross bars; sides of the body with series 

 of dark blotches; middle of the lower fins blackish. paleatus 462. 

 gg. A dark vertical bar on the first dorsal rays sometimes extending 

 on to the body below; anal fin barred or spotted; ventrals and pec- 

 torals plain. punctatus 463. 

 ggg. Dorsal with a black spot on ends of rays. 



h. Anal spotted; dark brown above, 3 series of dark spots along 

 middle of side. trilineatus 464. 



hh. Anal plain. 



i. Lat. pi. \\; azygous plates none; a pale band on side; clavicle 



and opercle with blue reflections. (Cope.) acutus 465. 



. Lat. pi. f ; azygous plates 4; numerous black dots on the side 



shields, which are wanting on middle line of side; a black spot 



at the base of the dorsal spine. (Cope.) amphibelus 466. 



ccc. A hastate black spot at base of caudal fin, margined behind by 



white; a black lateral band. hastatus 467. 



456. Corydoras eques. 



Corydoras e^MesSteiudachner, Ichthyol. Beitr. v, 92, pi. 12, figs 3-3, 



1876 (Teffe; Cudajas). 

 Habitat: Solimoens. 



Form heavy forward, decreasing backward; at the 

 dorsal spine high, compressed, the width about H in the 

 greatest depth; the caudal peduncle much compressed, 

 its depth less than half the depth at the dorsal spine. 



Head short and very deep, the width nearly equal to 

 its length, the profile convex and steep, especially steep 

 from above the eyes forward; transverse profile strongly 



