52 Mr. C: T. Regan on the SoutJi-American 



1). XV 0-10. Scales 29-31 ,/'|^. Pectoral extending 



to above the anal spines; caudal peduncle longer 



than deep 4. cupido. 



r>. XV-XVI 11-12. Scales 30-31 ---,. Pectoral 



10-11 



extending to above the anal spines; caudal pe- 

 duncle longer than deep 5. camopiensis. 



2. Dorsal with 17 to 19 spines C. surinamensia. 



B. Pectoral not or scarcely extending beyond the origin of anal. 



1. Pectoral extending about to above the origin of anal; last 



dorsal spine from | to h the length of head, 



1). X rV-X VI 9-10. A. Ill 0-7 " 7. jxrupan. 



1 ). X 1 V-X VI 10-13. A. Ill 8-9 8. ' bramliensis. 



2. Pectoral not extending to above the origin of anal ; last dorsal 



spine i the length of head. D. XVI 10-11. A. Ill 7-8. 



9. crassilahris. 



II. 19-21 gill-rakers on the lower part of the anterior arch. 



A. D. XV 10. A. Ill 7 ; dorsal spines subequal from the third, 



which is \ the length of head ; pectoral extending to above the 

 origin of anal 10. pajjpaterra. 



B. D. XII-XIV 11-14. A. Ill 7-8. 



Last dorsal spine \ the length of head ; pectoral ex- 

 tending to above the vent 11. dccinon. 



Last dorsal spine § the length of head ; pectoral ex- 

 tending to abovo the anal spines 12. acuticeps. 



1. Geophagus Balzani. 



Geophugtts Bnlzmii, Perugia, Ann. Mus. Genov. (2") x. 1891, p. 623 ; 



Pellegr. ^hS.u. Soc. Zool. France, xvi. 1903. p. 191 (1904). 

 Geophaf/iis duodeciiiixpinosus, Bouleng. Proc. Zool. Soc. 1895, p. 524, 



and Trans. Zool. Soc. xiv. 1896, pi. iv. lig. 1 ; Eigenm. & Kennedy, 



Proc. Ac. Philad. 1903, p. 535 ; Pellegr. /. c. 



Depth of body 1| to nearly 2 in the length, length of 

 head nearly 3. Snout 2|-2.^, in the length of head, diameter 

 of eye 3^-3^, interorbital width 2;=;-2^, depth of prteorbital 

 2|-2J-. MaxiUary not extending to below the eye; jaws 

 equal" anteriorly; fold of the lower lip continuous; cheek 

 Avith 7 series of scales; 10 or 11 gill-rakers on the lower 

 part of anterior arch. Scales 28-29 y^fij, 3 between lateral 

 line and anterior rays of soft dorsal, those of the thoracic 

 region small. Dorsal XII (XIII-XIV 12) 13-14, tliespines 

 subequal or only slightly increasing from the fourth, the 

 last from more than ^ to nearly ^ the length of head. 

 Anal III (7) 8-9. Pectoral much longer than the head, 

 extending to the end of the base of anal. Caudal truncate 

 or slightly emargiuate. Caudal peduncle ^-| as long as 

 deep. Olivaceous ; a dark stripe bslow the eye ; body with 



