JULY, 1907. FISHES OF GREAT LAKES, NICARAGUA MEEK. 123 



regard them as more than one species meant only to limit the number 

 by the material at hand, and so I have lumped them all in one. 



The fact that no red forms were found in Lake Tiscapa and Lagoon 

 Jenicero led me to believe that there was possibly one form or species 

 in which rubrism did not occur, but I found myself unable to dis- 

 cover any constant character or characters to separate it from the 

 others, except on color alone. As to form, some individuals are very 

 deep, others quite elongate. On some with normal color there are 

 well denned lateral bars but no trace of a lateral spot, on other speci- 

 mens of same size or larger, the lateral blotch is well defined. On 

 some of the more elongate forms (of about 140 mm.) from Lake 

 Nicaragua the nuchal hump is well developed, while on many of the 

 larger individuals it is quite absent. There were no markings or pecu- 

 liarities that I was able. to correlate with sex or size. It is possible that 

 more than one species should be recognized here, and no doubt such 

 will some day be the case, especially if some enthusiastic student of 

 fishes has at his command a far less amount of material than I have 

 had the opportunity to examine. 



Dark forms: Momotomba (9), 65 to 195 mm.; Managua (77), 

 90 to 280 mm.; Tiscapa (21), no to 180 mm.; San Francisco (15), 

 65 to 155 mm. ; Jenicero (n), 50 to 150 mm.; Granada (61), 130 to 250 

 mm.; Cisplaya (5), 40 to 120 mm. 



Red forms: Momotomba (i), 265; Managua (17), 160 to 260 mm.; 

 Granada (29), 130 to 260. 



Cichlasoma dorsatum sp. nov. 



Type, No. 5971, F. M. N. H.; length, 179 mm.; Lake Managua, 

 Managua, Nicaragua. 



Head 2.4 to 2.5; depth 2.1 to 2.2; D. xvn, n; A. vn, 8; scales 

 7-32-11. Body deep, dorsal region elevated, profile slightly concave; 

 nuchal region slightly gibbous; jaws subequal; lips very broad, the 

 lower with free margin; anterior teeth enlarged, those of upper jaw 

 the larger; snout moderately pointed, 2.4 to 2.7 in head; preorbital 

 4:3 to 4.5; postorbital 2.4 to 2.5; diameter of eye 3.6 to 4.11; eye to 

 margin of subopercle 2.7 to 3.1; mouth moderate, slightly oblique; 

 maxillary nearly reaching vertical from anterior of eye, its length 2.7 

 to 2.9 in head; mandible 2.3 to 2.4; interorbital 2.9 to 3.1; snout to 

 scales on nape 1.9 to 2.0; cheeks with four rows of scales; dorsal fin 

 rather low, its last spine 2.3 to 2.6 in head; middle rays of dorsal fin 

 reaching to middle of caudal fin, those of anal shorter; origin of dorsal 

 to tip of snout 2.1 to 2.2 in body; base of anal fin 3.7 to 3.8 in body, 

 its last spine 2.4 to 2.7 in head; ventral fins reaching third anal spine, 



