American Cichlid Oenus Cichlosoraa. 65 



iu the length of head ; dark cross-bars and a 

 dark lougitudiual band from operculum to 



base of caudal 22. Gadovii, 



2 or 2| scales between lateral line and base of 

 anterior part of soft dorsal ; a broad dark 

 band from operculum to middle of side and 

 thence running upwards to the dorsal tin ... . 23. intermedium. 



tttt Depth of body 2f-2f in the length. 



D. XVIII 13. A. VI 9-10 24. Guentheri. 



D. XVI 12, A. V 8 , 25. pavonaceum. 



y. Last dorsal spine 5 the length of head ; depth of body 

 25-21 iu the length. 

 D. XVII 11. A. V 8. Depth of body 2^ in the 



length 2G. Sieboldii. 



D. XVI-XVII 12-13. A. V 10. Depth of body 



2f-2| in the length 27. Godmanni. 



8. Last dorsal spine ^-| the length of head ; depth of body 

 3-3iin the length. D. XV-XVII 12-14. A. IV-V 9-10. 



28. irregulare. 



b. Caudal emargiuate, with rounded lobes. 



29. lentiginosuin. 



6. D. XVin-XrX lO-ll. a. VII-VIII 7-9. 9 or 10 gill-rakers 



on the lower part of the anterior arch. Pectoral ex- 

 tending to above the origin of aual or beyond. 

 Interorbital width 3 iu the length of head ; pec- 

 toral extending to above the origin of anal. . 30. balttatum. 

 Interorbital width 2i-2-| in the length of head ; 

 pectoral extending a little beyond the origin 

 of anal 31. nicarcujuense. 



7. D. XIV-XVII 10-14. A. V-yil 8-10. 9 to 13 gill-rakers ou 



the lower part of the anterior arch. Depth of body f its 

 length or more. Pectoral extending beyond origin of anal or 

 11 to 13 gill-rakers ou the lower part of the anterior arch. 

 Soft dorsal more or less distinctly scaly at the base. Lips 

 normal. 



a. Fourth to sixth dorsal spines longer than the rest. 



D. XVI 10-11. A. VI 8-9. 

 Pectoral extending to above the middle of anal , . 32. Robertsoni. 

 Pectoral extending to the posterior end of anal . . 33. lon(/imanus. 



b. Dorsal spines either subequal from the fifth or sixth or 



increasing in length throuu-hout. 

 a. D. XIV-XV 12-15. A. V 8-9. Snout shorter than post- 

 orbital part of head. 

 Pectoral extending beyond the origin of anal .... 34, macr acanthus. 

 l'ectt)ral not extending beyond the origin of anal. 35, lieterodontus. 



^. D. XVI 11. A. V 8-9. Snout longer than postorbital 

 part of head ; pectoral extending nearly to the origin uf 



anal 36. altifrons. 



y. D. XVI-XVII 11-12. A. VII 8-9, 



t Pectoral extending to above the last anal spine, 



37. rostrutum. 



Ann. d: Mcuj. N. lliat. Ser. 7. Vol. xvi. 5 



