MAY, 1902. THE ICHTHYOLOGY OF MEXICO MEEK. gi 



larger; peritoneum black; alimentary canal shorter than the 

 total length of the fish; origin of dorsal slightly in advance of 

 anal, midway between tip of caudal and posterior margin of the 

 orbit: base of dorsal 2^ in head, its height slightly more than 

 half head; pectoral ijj in head; ventral a|; caudal fin subtruncate. 



Brownish olive, a dark spot in the middle of each scale. These 

 spots are more prominent on the posterior half of the body of 

 males which are from i J to i| inches in length. In these males 

 there is usually a row r of spots on base of dorsal and anal fins. 

 Young specimens have a few faint dark cross bars on the sides, 

 which, in the larger females, become a faint dark lateral band. 



Largest specimens, 2.46 inches in length. This species 

 resembles Fundulus punctatus, from which it differs in having a 

 larger head, a more robust body, the more forward position of 

 the dorsal fin, and larger scales. It is evidently a smaller fish. 

 The larger specimens have no spots on dorsal and anal fins. 

 The type of Fundulus punctatus was taken at Chiapas, Guatemala. 



Oviparous; eggs quite mature, 100 eggs in a female 2.05 

 inches in length; diameter of eggs J- ff of an inch. Our specimens 

 were collected May 4. 



Time of spawning, about the third week in May. Oaxaca. 



ZOOGOXETICUS, gen. nov. 



Type, Pti'dlia quitzeocnsis B. A. Bean. 



This genus has the general appearance of Fundulus, differing in 

 the modification of the reproductive organs. The anal of the male 

 has the first 5 or 6 rays short and stiff. The ovary is a strong mem- 

 branous sack with several fold-like partitions. In this the young 

 are hatched, and reach a comparatively large size, after which they 

 are then born.. 



The body is usually deeper than in Fundulus, and the anal and 

 dorsal fins are usually longer. The dorsal fin of the male is con- 

 siderably higher than that of the female. 



Zoogoneticus quitzeoensis (B. A. Bean). 



This species was first known from a female collected in Lake 

 Quitzeo by Mr. Nelson, and described by Mr. B. A. Bean. It 

 has a short intestine, the length being i \ times total length of the 

 fish. The teeth are conical and in more than one series, the 

 dentition being that of Fundulus. 



