GAMBUSIA, 57 



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 3| in the length, length of head 3i to 33. Snout as long as or shorter than eye, the 

 diameter of which is 3 to 3j 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 lougitudinal series. Dorsal 10-12; 

 origin equidistant from tip of snout and middle or posterior part of caudal ; free edge of the fiu 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 |- 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. 



Hal. Costa Rica, Carrillo and Juan Viiias (Underwood), Irazu (Rogers). 



Numerous specimens, measuring up to 70 mm. in total length. 



This species is very close to G. episcoin, 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. terrabeiisis, Regan, and G.jonesii, Giinther, and with them forms a series from 

 G. episcopi to G. (Pseudoxiphophorus) bimaculata, Heck., so that the genus Psendo- 

 a-ipJiOpjJiorus can uo 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 3^ to 3| in the length, length of head 3^ to 3i. Snout shorter than eye, the diameter of which 

 is 3 to 3 J ill the length of head; interorbital width equal to the distance from posterior margin of pupil 

 to free edge of 0[)erciilum. 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 nearl}- | the length of head. Caudal subtruncate. Least 

 depth of caudal peduncle nearly -j- the length of head. Scales of the upper part of the body with dark 

 edges; an interi'upted dark lateral stripe ; dorsal tin 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. 



Ilab. Costa Rica, Rio Grande de Terraba, Pacific Slope (Plttier). 

 Six specimens, measuring up to 48 mm. in total length. 



10. Gambusia jonesii. (Tab. XII. fig. 8.) 



MoUienisiajoaesii, (ixmili. Ann. Tsl&g.l^i.'ii.. (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'. 

 Pseudoxiphoplioriis bimaculatus (nou Heck.), Jord. & Everm. t. c. p. 678 '. 

 Pseudoxiphujjliorus paucirudiutus, Regan, Ann. Mag. N. H. (7) xiii. 1904, p. 256 ', and (7) xvi. 



1905, p. 362 =. 



Very closely allied to G. himacidaUx. Dorsal 11-13 ; origin of dorsal equidistant from tip of snout and 

 middle or posterior part of caudal. Longest anal ra}' -f to |^ 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 aud 

 caudal \\ith an oblong dark si.ot on each iuterradial membrane. 



BIOL. CENTK.-AMEE., Pisces, JllljJ 1907. O 



