neio Ci'chlid Fish from Demerara. 



371 



gill-rakers of the outer series on the lower part of tlie anterior 

 arch. Scales 24 g ; upper lateral line extending to below 

 end of spinous dorsal, from which it is separated by 1 or 1^ 

 series of scales for most of its course. Dorsal XV 7, the 

 spines increasing in length to the last, wliich is more than ^ 

 the length of head ; twelfth spine equal to or a little more than 

 i the length of head. Anal III 6; third spine less than ^ 

 the lengtii of head. Pectoral a little shorter than the head. 



:^^^:^^AM, 



Ileteror/ramittft steindachneri. 



extending to above the origin of anal. C-audal rounded ; 

 caudal peduncle deeper than long. Brownish ; a dark lateral 

 stripe from eje to base of caudal ; a dark stripe from eye to 

 upper lip, another from eye to interoperculum ; dark cross- 

 bands on the posterior part of the body ; vertical tins dusky ; 

 membrane between first three spines of the dorsal blackish ; 

 posterior part of soft dorsal and anal with oblique stripes ; 

 caudal with transverse stripes and with a dark spot at the 

 base. 



Hah. Georgetown, Demerara. 



Two specimens, 70 and 75 mm. in total length. 



Closely allied to //. ajassizii, 8tdr., and to //. anucnum, 

 Cope, which have a ditfereut coloration, whilst the former is 

 also distinguished by the more slender form, the latter by the 

 lower spinous dorsal fin. This is probably the species 

 described from the Amazon by Steindachnor (Sitzungsb. Ak. 

 Wien, Ixxi. 1875, p. 115) as Geophagus tivn>utus, Gthr., but 

 which ditTers from the last-named species in the deeper bodv, 

 shorter fin-spines, smaller eye, &c. 



