19. GIRARBINUS. 353 



Body uniform brownish olive, dorsal fin with the upper margin 

 blackish. 



BrazU ; Caraccas. 



a. Female, 2| inches long. Brazil. From Mr. Clausen's Collection. 

 h-f. Females. Caraccas. Presented by the Berlin Museum. 



5. Girardinns guppii. 

 D. 7-8. A. 8-9. V. 5. L. lat. 26-28. L. transv. 8. 



The height of the body is two-sevenths of the total length (with- 

 out caudal), the length of the head nearly one-fourth ; males rather 

 more slender. The diameter of the eye is more than the length of 

 the snout, not quite one-third- of that of the head, and three-fifths 

 of the width of the interorbital space, which is flat. In both sexes 

 the origin of the dorsal fin is somewhat nearer to the extremity of 

 the snout than to that of the caudal, and in the female it is opposite 

 to the origin of the anal. Caudal fin large, rather longer than the 

 head, obtusely rounded behind. The free portion of the tail is some- 

 what elongate, the length of the base of the anal being one-third of 

 its distance from the caudal. Pectoral fin as long as the head, not 

 extending so far backwards as the ventral fins, which reach the 

 origin of the anal. 



In the male the anal fin is advanced to between the ventrals, 

 which are elongate. The anal process, formed by two or three rays, 

 is as long as the head, and without hooks. 



The female is yellowish olive, with the belly silvery, atid with the 

 trunk above the belly blackish ; all the scales with a narrow blackish 

 edge. 



The male is conspicuously marked : two brown streaks run along 

 the trunk, and are sometimes confluent into a band; one brown streak 

 runs along the middle of the side of the tail, a round black spot be- 

 hind the shoulder, another at the commencement of the caudal streak, 

 a third at the root of the caudal. One or two of these spots may be 

 absent. 



Trinidad; Venezuela. 



a. Many male (1 inch long) and female (Ig inch long) specimens. 



Presented by Lechmere Guppy, Esq. 

 h~d. Adult male and females. Venezuela. Mr. Dyson's Collection. 



The male from Venezuela difi'ers somewhat in coloration from those 

 from Trinidad. The spaces between the brown streaks are occupied 

 by very large silvery patches, and there is a largo ovate black spot 

 in the middle of the side of the tail. 



6. Girardinus pleurospilus. 

 D. 8. A. 9. V. 6. L. lat. 28. L. transv. 8. 

 The height of the body is somewhat more than the length of the 

 the head, which is one-fourth of the total (without caudal) ; the dia- 

 meter of the eye is more than the length of the snout, one-third of 



VOL. VI. 2 A 



