CYPRINODONT FISHES. 989 



cJ. Dorsal origin eqxiidistant from eye or postorbital part of 

 head and base of caudal ; longest rays |^ the length of head. 



Jamaica. 



Six females, measuring up to 47 mm. in total length, and seven 

 males, the largest 33 mm. Some of these were collected by 

 C. A. Wray, others by the Rev. J. Seed Roberts. 



15. Gambusia gkacilior, sp. n. (PI. XOIX. figs. 5, 6, and 

 Text-fig. 168 C.) 



2 • Depth of body equal to or a little more than length of 

 head, which is 3^- (young) to 4 in the length of the fish. 

 Diameter of eye 3 in length of head, interorbital width 2. 

 31 to 33 scales in a longitudinal series. Dorsal 8-9 ; origin 

 above end of anal, a little nearer to base of caudal than to base 

 of pectoral ; fin rounded, longest rays ^ length of head. Anal 

 10-11 ; first or second branched rays longest, the rest regularly 

 decreasing. Pectoi'al as long as head without snout ; pelvics 

 reaching vent. Caudal rounded or subtruncate. Caudal peduncle 

 slender, its least depth -^ the length of head. Brownish above, 

 yellowish below ; usually a narrow dark lateral stripe, some- 

 times a few scattered dark spots ; dorsal and caudal with small 

 spots. 



c^ , Dorsal farther forward and more elevated ; origin about 

 equidistant from middle of opercle and base of caudal ; longest 

 rays about |- the length of head. Least depth of caudal peduncle 

 3^ the length of head. 



Jamaica. 



Eight females, measuring up to 50 mm. in total length, and 

 five males, the largest 37 mm., collected by C. Wiuy. These were 

 mixed up with the examples of G. oligosticta, and could be picked 

 out by their more slender form and smaller head, characters 

 found to be associated with difierences in the structure of the 

 intromittent organ. 



16. Gambusia dominicbnsis, sp, n. (PI. XCIX. fig. 7, and 

 Text-fig. 169 C.) 



$ . Depth of body 3-^ in the length, length of head 3|. 

 Diameter of eye 3^ in length of head, intei'orbital width 2. 

 28 or 29 scales in a longitudinal series. Dorsal 9 ; origin above 

 posterior end of anal, nearer base of caudal than base of pectoral ; 

 longest rays f length of head. Anal 10-11 ; first branched ray 

 longest. Pectoral |- length of head ; pelvics i-eaching origin of 

 anal. Least depth of caudal peduncle ^ length of head. 

 Brownish, scales dark-edged ; a faint lateral stripe ; a few 

 scattered dark spots on upper parts ; abdomen golden ; dorsal and 

 caudal fins with series of small dark spots. 



c^" . Dorsal origin equidistant from head and base of caudal. 



Haiti. 



A female of 52 mm., and two males, each 25 mm. in total 

 length, presented by Herr A. Rachow. 



Proc. Zool. See— 1913, No. LXYI. 66 



