94 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. III. 



Viviparous; One female 3 inches in length contained 28 young, 

 each about .60 inch in length; another female 3.15 inches in 

 length contained 47 young, each .43 inch in length; egg all 

 absorbed. Specimens collected May 19 to 24. Spawning sea- 

 son about the last of May or early in June. Named for Porfirio 

 Diaz, President of the Republic of Mexico. Patzcuaro: Zir- 

 ahuen. 



Zoogoneticus miniatus, sp. nov. 



Type, No. 3680, F. C. M. Length, 1.60 inches. 



Locality, Lago de Chalco, near Chalco, Mexico, Mexico. 



Head 3!: depth 3^; D. 17: A. 14: scales 32-14. Body 

 elongate, compressed: mouth rather large, very protractile, 

 lower jaw slightly the longer; teeth conical, very large, in a band; 

 eye 2|: snout 4^: interorbitals 3: pectorals short and broad, 

 i^ in head: ventrals 3; origin of dorsal fin midway between base 

 of caudal and middle of preopercle, and slightly in advance of 

 origin of anal. 



Intestinal canal short, about as long as body; anal fin modi- 

 fied, the first 7 rays short, the other 7 long, and the two groups 

 of rays separated by a shallow notch. 



Olivaceous, much mottled w r ith darker. No distinct lateral 

 band. The last blotch forms an indistinct black caudal spot. In 

 general color and form this fish very closely resembles Skiffia 

 variegata. Largest specimen (Type) 1.60 inches long. 



Total number of specimens 5, in rather poor condition. 

 Chalco. 



This genus includes the following species: 



Zoogoneticus quitzeoensis (B. A. Bean). Lago de Ouitzeo; 

 La Barca: Ocotlan. 



Zoogoneticus dugesii (Bean). Guanajuato; Lagos: Patzcuaro. 



Zoogoneticus robust us (Bean). Guanajuato: Ocotlan: Patz- 

 cuaro; Zirahuen. 



Zoogoneticus guatemalensis (Gunther). Lake of Duenas; 

 Lake Amatitlan; Rio Guacalate, Western Ecuador. 



Zoogoneticus pachycephalus (Gunther). Lake Atitlan. 



Zoogoneticus labialis (Gunther). Rio San Geronimo: Guate- 

 mala: Yzabal. 



Zoogoneticus diazi Meek. Patzcuaro: Zirahuen. 



Zoogoneticus miniatus Meek. Chalco. 



