( . UKROS. 21>l{ 



fifths in the total length (witliout caudal), the length of the head 

 twice and three-foui'ths. Head as high as long ; snout compressed, 

 elevated, with the cleft of the mouth oblicjue and with the lower jaw 

 prominent. PrKo:bital wider than the orbit (in the larger indi\-i- 

 duals), the diameter of which equals the width of the interorbital 

 space ; the eye is considerably nearer to the extremity of the oper- 

 culum than to that of the snout. Opercles scaly ; suboperculum with 

 two or thi-ee series of small scales. 



Dorsal and anal fins entirely scaleless ; dorsal spines rather strong 

 and long, the length of the twelfth being two-fifths of that of the 

 head. Anal spines very strong. The middl(> of the soft dorsal and 

 anal is sometimes produced into a long filament, extending beyond 

 the middle of the caudal. The free portion of the tail is a little 

 higher than long. Caudal slightly emarginate, two-ninths of the 

 total length. Pectoral nearly as long as the hcad;^ extending to the 

 middle of the soft anal ; the outer ventral ray is produced. The 

 distance between the vent and the root of the ventral is one-third of 

 the length of the head. 



Olive, with five or six dark cross-bands, thn middle of which has 

 a deep-black spot where it passes the lateral line ; a more or less 

 distinct /black spot on the suboperculum ; sides of the head and ver- 

 tical fins with bluish, dark-edged ocelli. 



Tliis species is very closely allied to //. aureus, but may be di- 

 stinguished from it by larger scales, by a more backward position of 

 the eyes, by stronger spines, &c. 



13. Heros spurius. 



Ileros se varus, Heckvl, Bras. Iluss-Fische, p. 3G2. 



coryphajus, Hcckel, I. c. p. 364. 



modest us, Hcckel, I. c. p. 3G6. 



spurius, Heckvl, I. c. p. 3(58. 



? Cliromys appendicidata, Casteln. Anim. nouv. ou rarcs Ani6r. Sud, 

 Poiss. p. 15. pi. 7. fig. 3. 



D■•i^^ A.^,. L.lat.29. L. trunsv. M±!. 



The fold of the lower lip continuous in the middle ; five series of 

 scales on the cheek. The height of the body is more than one-half 

 of the total length (withoiit caudal). A dark vertical band bt^twcen 

 the dorsal and anal, terminating in a blackish spot on the root of the 

 anterior dorsal and on that of the posterior anal rays. Tlie remainder 

 of the fish either nearly uniform dark-brown, or lighter with more 

 or less distinct vertical bands ; head with short vermiculated lines ; 

 body with series of broAvn dots. 



Fresh waters of Brazil and Guiana. 



n--h. Fine specimens. River Cupai. Purchased of Mr. Stevens. — 



Dark variety, 

 c. F'ine specimen. (Juiana. Presented by Sir R. Schoniburgk. — Light 



variety. 

 Fine si ocimen. Fioni the (!ollection of the Zoological Society. 



Liffht variet\-. 



