n8 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. VII. 



aa. Mouth smaller, the mandible less than half the length of the 

 head ; teeth subequal, anterior occasionally slightly enlarged. 



c. Soft dorsal, anal and caudal fin scaly at base, the scales on 



interradial membranes; fold of the lower lip continuous. 



d. Base of anal fin shorter than the head; anal spines less than 9 ; 



lower margin of eye above a line from upper lip to upper edge 

 of base of pectoral (Erythrichthus) . 



e. Lips normal. 



f. Dorsal spines low, the last one 3.4 to 3.7 in length of head ; pec- 



toral fin short, 1.3 to 1.4 in head. granadense 121 



ff. Dorsal spines high, the last one 2.3 to 3.0 in length of head ; pec- 

 toral fins longer, i.o to 1.2 in head. citrinellum 121 

 ee. Lips very broad, slightly produced medianly. 



g. Snout short, 2.36 in head; depth, 2.14 in body; lips very broad, 



not thick; color not red. dorsatum 123 



gg. Snout longer, 2.10 in head; depth, 2.36 in body; lips broad and 

 thick; color red, or nearly so. erythr&um 124 



eee. Lips broad and thick, medianly produced into a long triangu- 

 lar flap. 



i. Red or yellowish to nearly black with red blotches, dark indi- 

 viduals with bars and lateral and caudal spots indefinite or 

 absent. labiatum 124 



ii. Olivaceous with dark bars and prominent lateral and caudal 

 spots. lobochilus 125 



dd. Base of anal fin longer than the head, its spines 9 or more; 

 lower margin of eye on or below a line from upper lip to upper 

 edge of base of pectoral (A rchocentrus) . centrarchus 126 



cc. Soft dorsal, anal and caudal fins not scaly at their bases; fold 



of the lower lip not continuous, 

 k. Mouth moderate ; snout pointed ; pectoral fin long, reaching to 



or beyond last anal spine (Thorichthys) . 



1. Interobital narrow, 3.5 to 3.7 in length of the head; depth of 



body 2.1 to 2.2 in length; no dark lateral band; caudal fin 



profusely spotted or barred. rostratum 126 



11. Interorbital broader, 2.8 to 2.9 in head; depth of body 1.9 to 



2.0 in length; a dark lateral band from eye to lateral spot; 



caudal fin not spotted. longimanus 127 



kk. Mouth small ; snout rounded or bluntish ; pectoral fin shorter, 



not reaching middle of spinous portion of anal fin (Theraps}. 



m. Body deep, 2.1 in head; profile moderately steep; vertical fins 



unspotted. nigritum 128 



mm. Body elongate, 2.4 to 2.7 in head; profile very steep. 



