128 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. VII. 



portions of dorsal and anal fins with light spots; caudal fin plain or 

 with very few light spots. 



The individuals of this species in the collection range in length 

 from 45 mm. to 165 mm. An examination of 6 of the larger ones to 

 determine sex showed these to be females. I was unable to determine 

 positively the sex of the younger individuals. I also examined a 

 number of individuals of the preceding species, all of which proved 

 to be males. It is quite probable that C. rostratum and C. longima- 

 nus are the same species, the former being males, the latter females. 

 The material that I have examined is insufficient to positively de- ( 

 termine this point, and so I have preferred to recognize the two 

 species rather than substitute one doubt for another by combining 

 them. 



Momotomba (i), 100 mm.; Managua (5), 100 to 125 mm.; San 

 Francisco (9), 90 to 125 mm.; Jenicero (55), 45 to 155 mm.; Cis- 

 playa (12), 100 to 165 mm. 



Theraps. 



Cichlasoma nigritum sp. nov. 



Type, No. 5979, F. M. N. H.; length, 142 mm.; Lake Nicaragua, 

 Granada, Nicaragua. 



Head 2.95; depth 2.09; D. xvn, 12; A. vn, 9; scales 8-32-12. 

 Body deep, compressed, dorsal region elevated, profile steep, evenly 

 convex, with slight interorbital depression ; mouth small with conical 

 teeth, the anterior ones slightly the larger; maxillary not reaching 

 vertical from front of orbit, its length 3.62 in head; snout 2.41; 

 mandible 2.89; preorbital 4.01; postorbital 2.58; diameter of eye 

 3.35; distance of eye to lower margin of subopercle 2.58; interorbital 

 2.68 ; tip of snout to scales of nape 2.76 ; lower lip with a broad frenum ; 

 scales on cheek in five rows; origin of dorsal fin over base of pectoral, 

 its distance from tip of snout 2.27 in body; dorsal spines increase 

 rapidly to fifth, then gradually to last one; last dorsal spine 1.90 in 

 head; last anal spine 1.72; base of anal fin 3.68 in body; middle rays 

 of dorsal and anal fins reaching past middle of caudal; pectoral short, 

 1.2 in head, its tips not reaching first anal spine; ventrals 1.05 in 

 head, their tips reaching third anal spine; caudal fin rounded, its 

 middle slightly marginate. 



Color dark olivaceous, plain; middle of scales darkest, forming 

 faint lateral stripes ; no lateral or caudal blotch ; no dark lateral band ; 

 soft dorsal with few dark spots; all of the fins except pectorals dark. 



One specimen 142 mm. in length. 



