292 CHKOMIDES. 



terior dorsal rays ; the seventh across the free portion of the tail. 

 A large black, white-edged ocellus on the root of the caudal. Fins 

 blackish ; pectoral yellowish towards the base. 



11. Heros aureus. 



D. J. A. |. L. lat. 33. L. transv. 6/13. 



The fold of the lower lip is continuous in the middle. Scales on 

 the cheek in five series. Base of the dorsal scaleless. 

 Guatemala. (Mexico.) 



a. Guatemala. From Mr. 0. Salvin's Collection. 

 ? b. Young. Mexico. From M. Salle's Collection. 



Description of the specimen. — The height of the body is contained 

 twice and a third in the total length (without candal), the length of 

 the head three times. Head as high as long ; snout somewhat ele- 

 vated, with the cleft of the mouth very oblique and with the jaws 

 equal anteriorly ; praiorbital as wide as the orbit, the diameter of 

 which is contained thrice and a third in the length of the head, and 

 is more than the width of the interorbital space. The eye is situated 

 immediately below the upper profile, a little nearer to the extremity 

 of the operculum than to that of the snout. Opercles scaly ; suboper- 

 culum rather broad, with two series of scales. 



Dorsal and anal fins entirely scaleless ; dorsal spines rather slender, 

 the length of the twelfth being a little less than one-half of that of 

 the head ; the points of the soft dorsal and anal extend to the middle 

 of the caudal. The distance between the dorsal and caudal is some- 

 what less than the greatest depth of the free portion of the tail. 

 Caudal sUghtly emarginate. The pectoral extends to the soft anal ; 

 ventral pointed. The distance between the vent and the root of the 

 ventral is one-third of the length of the head. 



Yellowish-olive, with six dark cross-bands, extending downwards 

 to a yellow longitudinal band running from above the pectoral to 

 the lower half of the base of the caudal. The thii-d cross -band ter- 

 minates in a large black lateral spot ; sides of the head with several 

 bluish dots, and with a blackish spot on the operculum and suboper- 

 culum, darkest on the latter bone. Fins light- coloured, immaculate. 



The length of the typical specimen is 57 lines. 



12. Heros afftnis. 



D. i|. A. g. L. lat. 29. L. transv. 5/12. 



The fold of the lower lip is continuous in the middle. Scales on 

 the cheek in four series. Base of the dorsal scaleless. Eye nearer 

 to the end of the operculum than to that of the snout. A black spot 

 in the middle of the side. 



Guatemala. 

 a-d. From 31 to b\ inches long. Lake Peten. From the Collection 

 of Messrs, Salvin and Godman. 



Description. — The height of the body is contained twice and two- 



