MAY, 1902. THE ICHTHYOLOGY OF MEXICO MEEK. 101 



female. Peritoneum, black, intestinal canal elongate, coiled on 

 ventral and right side, its length three times the total length of 

 the body. Mr. Bean kindly sent me one of the types of Goodea 

 atripinnis. It is more slender than the specimens of this species 

 in our collection. A study of the material in hand leads me to 

 believe that all specimens listed below belong to one species. 



Huingo, longest specimen 3.20 inches in length, average 

 length 2 to 2.50 inches. Head about 3^; depth 3. These speci- 

 mens are very light in color; collected May 26, had evidently 

 spawned a short time previously. . Gill-rakers 37 on first gill- 

 arch; vertebrae 17-1-19=36. Viviparous. 



Celaya, a few gravid females collected May 28. 



Acambaro, females all spawned. Collected May 27. 



Lagos, females all spawned. Collected June 6. 



San Juan del Rio, one female 3.50 inches in length contained 

 44 young, each .53 inch in length, evidently near spawning time. 

 Collected May 16. 



Aguas Calientes, females spawned. Collected June 7. Gill- 

 rakers 38, vertebrae 19-1-17 = 36. 



Goodea luitpoldi (Steindachner). 



In general appearance this species resembles a Fundulus. It 

 reaches a length of 7.75 inches, and is perhaps the largest Mexican 

 species of the family to which it belongs. 



I have compared a large series of specimens from Lake Zira- 

 huen, Patzcuaro and Chapala, and find but one species. G. xal- 

 iscone, described by Jordan and Snyder from Lago de Chapala, is 

 evidently this same species. 



The specimens from Lago de Zirahuen are much darker than 

 those from other localities, and those from Patzcuaro are much 

 the lightest. 



Alimentary canal three times the total length of the fish; 

 peritoneum black; gill-rakers 40 on the first arch. 



This species is viviparous; one female from Patzcuaro 5.15 

 inches in length contained 31 young of about equal length, 

 longest 1.14 inches. There was no modification of the anal fin 

 in any of these young, as found in the adult male. This modi- 

 fication of the anal fin is a sexual character, which probably 

 appears when the sexual organs develop. 



Specimens from Patzcuaro were collected May 19 to 22, 

 Zirahuen May 24, and those from Chapala, June 2. The latter 

 had spawned before our arrival. 



