5i Mv. C. T. Regan on (he SoulJi~Aiueric<iii 



Acara minuta, Ilensel, appears to mc to be founded on 

 vcrv young examples of tins species. 



3. Geophagns brachyurus. 



Geophfigua: bracJn/urKs, Cope, Proc. Am. Phil. Soc. xxxiii. 1894, p. 105, 

 pi. ix. fig. 18 ; IV Ik'gr. Mem. Soc. Zool. Frauce, xvi. lUOi^, p. 195 

 {1904). ' 



Depth of body 2-2,^ in the length, length of head 2^-3. 

 Snout 25-3 in the length of head, diameter of eye 3-4j, 

 interorbital ^vidth 3-3^, depth of prseorbital 3-3i. Maxillary 

 not extending to below the eye ; jaws equal anteriorly ; fold 

 of tiie lower lip not continuous or subcontinuous ; eheek 

 M ith 4 to 6 series of seales, the lower 2 or 3 series sometimes 

 deciduous ; 8 to 10 gill-rakers on the lower part ol the ante- 

 rior arch. Scales 27-28 *=^, 1 or 2 between lateral line and 

 anterior rays of soft dorsal, those of the thoracic regiou 

 small. Dorsal XIV-XVI 8-10, the spines subequal from 

 tlie fourth, the last ^ the length of head. Anal III 8-9. 

 Dorsal and anal fins scaleless. Pectoral longer than the 

 head, extending to above the middle of anal. Caudal 

 truncate or slightly emarginate. Caudal peduncle |-| as 

 long as deep. Olivaceous, with obscure darker cross-bars 

 and with pearly longitudinal stripes along the series of 

 scales of the ])()sterior part of the body ; a dark blotch on 

 the middle ot the side; a dark vertical stripe through the 

 eye in the young, but not in the adult ; vertical fins usually 

 with oblique stripes, the dorsal sometimes with a dark edge; 

 outer half of the ventral fin blackish. 



Kio Grande do Sul; Uruguay. 



1-2. (89 and 99 mm.) llio Grande do Sul, Dr. II. von Iheriug. 



3-4. (o2 and 69 mm.) ^Mercedes, Uruguay. 0. V. Apliu, Esq. 



4. Geophagus cvpidu. 



Geophagus ciipiJo, Heck. Ann. Mus. ^Vien, ii. 1840, p. 399 ; Pellegr. 



Mem. Soc. Zool. France, xvi. 190.3, p. 189 (1904). 

 Mesops ciipidv, Giiuth. Cat. Fish. iv. p. 311 (]8ti2j. 

 Geophagus (Mesops) cupido, Steind. Sitzb. Ak. A\'iei), Ixxi. 1875, p. 107. 



Depth of body 2U2| in the length, length of head 31-31. 

 Snout 31 in the length of head, diameter of eye 2|, inter- 

 orbital width 3|, depth of prseorbital 31-3^. ]\i axillary not 

 extending to below the eye ; jaws equal anteriorly ; fold of 

 the lower lip continuous ; cheek Avith 6 series of scales ; 6 to 

 8 gill-rakers on the lower part of anterior arch. Scales 

 29-31 j;,!^, 3 between lateral line and anterior rays of soft 



