25 >2 ciiKiiMiDr.s. 



tt'rioi' <lni's;il r;iys ; tlic scvciiili iktoss the I've |)(irti(ni nf thi' tail. 

 A laijiv black, white-cd^-fd ocellus on tho root oi' tlic caudal. Fins 

 blackish ; pectoral yellowish towards the base. 



1 ] . Hevos aureus. 



n. "'. A. ' . I,, hit. SA. L. trniisv. C i:-;. 



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

 the cheek in live series. Huse of the dorsal scaleless. 

 (luatemala. (Mexico.) 



n. (Juatoniahi. From Mr. (). Salvin's Collection. 

 "^ b. ^'oung. Mexico. From M. Salle's Collection. 



/J(sn-ipfio>i of iJic spfciuien. — The height of the body is contained 

 twice and a tliird in the total length (without eaudiO), tlie length of 

 tli(> head tliree times. Head as high as long; snont somewhat ele- 

 vateil, with tlu; cleft of tho mouth very ob]i(iue and with th(> jaws 

 (•((ual anterioi-ly ; pra'orl)ital as wide as the orl)it, the diametei' of 

 which is coutained 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 up])(>r ])rofilc, a little nearer to the (extremity 

 of th(^ oj)erculum than to that of tho snout. Operclcs scaly ; sul)oi)er- 

 culum rather broad, with two series of scales. 



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

 the length of the tAVclfth Ijciug a little less than one-half of that of 

 the head ; the points of tlu; soft dorsal and anal cxtei 1 to tho middle 

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

 what less than the greatest depth of the fr(M> ])ortion of the tail. 

 Caudal slightly cmarginate. The pectoral extends to the soft anal ; 

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

 ventral is one-third <»f the length of the head. 



Yi'Ilowish-olivc, with six dark cross-bands, extending downwards 

 to a yellow longitudinal band running from above the jjcctoral to 

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

 minates in a large ])lack lateral spot; sides of the head with several 

 Iduish dots, and with a Idackish spot on the operculum and suboper- 

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



The length of the typical specimen is 57 liiu'S. 



32. Heros affinis. 

 [). 11, A.^'. L. lat. 29. I., transv. 5/12. 



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

 tlu; check 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. 



(iuatemala. 

 (itl. PVom ;irl to 5^ inches long. Lake IVten. From the Collection 

 of Messrs. Salvin and (Jodman. 



/>/sc,-iptit)ii. — The height of the l>ody is continued twicr and two- 



