DR. GUNTHER ON THE FISHES OF CENTRAL AMERICA. 481 
248. Hap.ocuitus povil. (Plate LX XXII. fig. 5.) 
Ginth. Fish. vi. p. 315. 
DNS eat 14S AVE Game Mat. Sie: transy.18; 
The height of the body is contained five times in the total length (without caudal), 
the length of the head thrice and two-thirds ; head elongate, low, and depressed, with 
the snout much produced and the upper jaw somewhat longer than the lower; the eye 
occupies exactly the middle of the length of the head, its diameter being two-ninths of it, 
and more than one-half of the width of the interorbital space, which is flat. The origin 
of the dorsal fin is a little nearer to the extremity of the caudal than to the gill-opening, 
and corresponds to the twenty-third scale of the lateral line. Anal fin entirely before 
the dorsal ; pectoral extending to ventral, which reaches the vent; caudal rounded; all 
the fins well developed. Light brownish olive; posterior half of the dorsal and anal fins 
with black cross bands; basal half of the caudal with round light spots. 
Two specimens, 6 inches long, probably males, were collected by Capt. Dow at Punta 
Arenas, Costa Rica. 
249. FUNDULUS LABIALIS. (Plate LX XXIV. figs. 1 & 2.) 
Ginth. Fish. vi. p. 319. 
B.6. D. 13-14. A. 16-17. V.6. L. lat. 37-39. L. transy. 15. 
The height of the body, taken on the level of the base of the pectoral, is two-ninths 
of the total length (without caudal). Head rather depressed, its length being contained 
four times or four times and a third in the total. Interorbital space broad, slightly 
convex, its width being less than one-half of the length of the head. Snout broad, 
obtuse, depressed, with the jaws perfectly equal in front; mandible very short, not 
longer than the eye. Upper lip well developed, broad, extending to the angle of the 
mouth. The diameter of+the eye is less than the length of the snout, or than one- 
fourth of that of the head, and, in females, one-half of the width of the interorbital 
space, whilst in males the forehead is somewhat narrower. The origin of the dorsal 
fin is midway between the extremity of the caudal and the orbit, and corresponds to the 
first ray of the anal. Dorsal fin as high as long in both sexes; anal fin rounded in the 
male, scarcely higher than long; much elevated in the female, the length of its base 
being two-thirds only of its depth. Genital opening of the female immediately in 
front of, but disconnected from, the anal fin. Basal third of the caudal fin (which is 
subtruncate) scaly. Body uniform brownish olive, paler below; sometimes irregular 
cloudy markings on the tail. Fins immaculate; the anal fin of the male is black at the 
base, and bright yellow on its marginal half; also the upper margin of the dorsal fin of 
the same sex is yellowish. 
Numerous examples, up to 4} inches long, were collected by Messrs. Salvin and 
Godman in the Rio San Geronimo and at Yzabal. Figure 1 represents the male, and 
fig. 2 the female. 
VOL. VI.—PART VII. 30 
