Haseman : E^xPEDiTiON TO Ckn'tral South America. 357 



Genus Rktroculi'S l^i^cnmaiin and l?ra\-. 



56. Retroculus lapidifer (Castt'lnan). 



No spccinuMis WLTf taken by me. Habitat. — "Aniazonas." 



Genus IIeterogramma Regan. 



57. Heterogramma agassizi (Steindachner). (Plate LXIV.) 

 No. 272Q, Mana<is, Xo\-. 30. 1909. 3.6 cm. 



Snout four-tiftlis as long as the diameter of the eye; I). XY, 6; A. 



1 2 

 III, 6; scales 2.5-23-8; depth 2.75; head 3; pores -; diameter of eye 



3 



equal to the interorbital space and four times the preorbital width; 



vertical fins red- and white-spotted; no caudal spot; a faint lateral 



band, but no cross-bars; a bar below the eye; pectoral fin about as long 



as the head; no distinct gill-rakers on the lower branch of the first 



arch; la^t dorsal spine seven-elevenths the length of the head; caudal 



peduncle seven-eighths to as long as deep. 



No. 2730C-&, 1.2-2.5 cm., Santarem, Dec. 11, 1909. 



Last dorsal spine five-ninths as long as the head ; snout a little shorter 

 than the diameter of the eye; lateral line in some cases with only a 

 few pores and in others almost complete; D. XV, 7; A. 111,7; head 3; 

 eye 3 ; depth 3 to 3.33 ; two rows of scales on the cheeks, and none on the 

 preoperculum; scales 2-22 to 25-7; pectoral fin as long as the head; 

 caudal peduncle as long as or a little longer than deep; a dark lateral 

 band from the eye to base of caudal, with faint caudal spots and median 

 lateral spots in a few cases; bands from the eyes to the mouth; only 

 three have bars from beneath the eyes to the interoperculum; vertical 

 fins with ashy white bars and spots; scales speckled with brown spots; 

 depth of preorbital not one-half the diameter of the eye. These 

 specimens do not agree with the description of the typical specimen. 

 No. 273ia-c, 1.7-2.1 cm., San Joaquin, Bolivia, September 4, 1909. 



Lateral lines incomplete; snout much shorter than the eye; last 

 dorsal spine not quite one-half the length of the head; depth 2.8; 

 head about 2.8; diameter of eye more than one-third the length of 

 the head; no gill-rakers on the first arch; caudal peduncle about as 

 long as deep; coloration like a typical specimen plus a spot on the 

 lateral band. 



58. Heterogramma taeniatum (Giinther). (Plate LXV'.) 

 No. 2732a-c, 2-3.6 cm., Braganga, Para, Dec. 29, 1909. 



One gill-raker on the lower anterior arch (one specimen with no 



