GAMBUSIA, O7 
8. Gambusia annectens. (Tab. XIV. figg. 5, 6.) 
Gambusia annectens, Regan, Ann. Mag. N. H. (7) xix. 1907, p. 259. 
Depth of body 3 to 32 in the length, length of head 32 to 33. Snout as long as or shorter than eye, the 
diameter of which is 3 to 32 in the length of head; interorbital width equal to the distance from middle 
or posterior part of eye to free edge of operculum. 28 to 31 scales in a longitudinal series. Dorsal 10-12; 
origin equidistant from tip of snout and middle or posterior part of caudal; free edge of the fin convex. 
Anal 9-10, pointed, originating a little in advance of the dorsal. Pectoral about # the length of head. 
Caudal rounded or subtruncate. Least depth of caudal peduncle about 2 the length of head. Scales 
with dark edges, forming series of spots on the lower part of the side; often a series of short dark vertical 
bars along the middle of the side ; a series of dark spots on the lower part of the dorsal fin. 
Hab. Costa Rica, Carrillo and Juan Vifias (Underwood), Irazu (Rogers). 
Numerous specimens, measuring up to 70 mm. in total length. 
This species is very close to G. episcopi, Steind., from Panama, which has only 8 or 9 
dorsal rays and also differs in having a blackish spot on the anal fin. It is also close 
to G. terrabensis, Regan, and G. jonesti, Giinther, and with them forms a series from 
G. episcopt to G. (Pseudoxiphophorus) bimaculata, Heck., so that the genus Pseudo- 
viphophorus can no longer be maintained, 
9, Gambusia terrabensis. (Tab. XII. fig. 7.) 
Gambusia terrabensis, Regan, Ann. Mag. N. H. (7) xix. 1907, p. 260. 
Depth of body 34 to 34 in the length, length of head 33 to 34. Snout shorter than eye, the diameter of which 
is 3 to 3} in the length of head; interorbital width equal to the distance from posterior margin of pupil 
to free edge of operculum. 29 to 31 scales in a longitudinal series. Dorsal 12-14; origin equidistant 
from tip of snout and base of caudal or a little nearer the latter. Anal 9-10; origin below or a little in 
advance of the middle of dorsal. Pectoral nearly ? the length of head. Caudal subtruncate. Least 
depth of caudal peduncle nearly 2 the length of head. Scales of the upper part of the body with dark 
edges; an interrupted dark lateral stripe; dorsal fin with a basal series of vertically expanded blackish 
spots and with a second series of smaller spots; anal dark at the base and also distally ; posterior part 
of caudal dusky. 
Hab. Costa Rica, Rio Grande de Terraba, Pacific Slope (Pittier). 
Six specimens, measuring up to 48 mm. in total length. 
10. Gambusia jonesil, (Tab. XII. fig. 8.) 
Mollienisia jonesii, Giinth. Ann. Mag. N. H. (4) xiv. 1874, p. 371°; Garm. Mem. Mus. Comp. 
Zool. xix. 1895, p. 52°; Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 698 °. 
Pseudoxiphophorus bimaculatus (non Heck.), Jord. & Everm. t. c. p. 678°. 
Pseudoaziphophorus pauciradiatus, Regan, Ann. Mag. N. H. (7) xiii. 1904, p. 256 *, and (7) xvi. 
1405, p. 362 °. 
Very closely allied to G. bimaculata. Dorsal 11-13; origin of dorsal equidistant from tip of snout and 
middle or posterior part of caudal. Longest anal ray # to 2 the length of head. Scales with dark edges, 
especially superiorly ; a dark spot on the operculum, another above the root of the pectoral, and a third 
on the upper part of the base of the caudal; dorsal with about 3 series of small dark spots ; anal and 
caudal with an oblong dark spot on each interradial membrane. 
BIOL. CENTR.-AMER., Pisces, July 1907. O 
