ICHTHYOLOGY OF VENEZUELA — SCHULTZ 83 



8a. Branched rays of dorsal 5 or 6, usually 6; of anal 11 to 14; total 

 rays of pectoral 13 to 15; scales 35 to 38; 3 or 4 rows of spots 

 on lower half of body most prominent. 



Bivulus hartii (Boulenger) 

 86. Branched rays of dorsal 8; of anal 13 to 15, seldom 13; total 

 rays of pectoral 15 to 17; scales 37 to 41; two rows of spots on 

 lower side of young and half grown most prominent. 



Rivulus holmiae Eigenmann 

 8c. Branched rays of dorsal 6 or 7, occasionally 6; of anal 12 to 15, 

 usually 14; total rays of pectoral 14 to 16; scales 38 to 41; 

 all rows of spots on females and young of about same promi- 

 nence Bivulus bondi, new species 



6b. Dorsal rays 11 or 12; head as deep as broad; body compressed, tail 

 more so; anal rays 12 or 13; pectoral 14; scales 30 to 32, 10 or 11 

 below origin of dorsal; color brownish, upper parts of head and 

 back darker; scales of opercle each with a large white or bluish 

 white spot; some scales of preopercle with similar spots, similar 

 but smaller spots scattered on some of the scales of the body and 

 tail; a dusky vertical band through eye and suborbital region, a 

 less distinct one along hind border of preopercle; dorsal, sometimes 

 anal and pelvics, with rows of dusky spots; caudal dusky, with 

 vertical rows of dark spots, but lower lobe of fin pure white, sharply 

 contrasting with the rest.-Bacliovia hummelincki De Beaufort 

 2b. Oribital rim with a free margin. 

 9a. Anal rays of males unmodified. 



10a. Teeth in both jaws in a single series of 3-pointed incisors, with middle 

 point a little longer and broader; origin of dorsal fin midway be- 

 tween caudal fin base and snout; anal origin under rear of dorsal 

 fin base or a little behind base; depth 2}^ to 2?^ head 2.7 to 2.9 in 

 standard length; gill membranes broadly united with a wide free 

 fold across the isthmus; about 23 or 24 rows of scales from head to 

 midcaudal fin base; humeral scale enlarged; dorsal rays ii, 8 or ii, 9; 

 anal rays usually ii, 8; a narrow blackish bar across base of caudal 

 fin; sides of body with dark bars or males may lack the dark bars 

 and have a dark streak along middle of sides; dorsal and anal fins 

 often with a black spot posteriorly except in mature males; an 

 elongate black bar occurs at front of fins; also in the males the fins 

 are more elongate and more heavily pigmented. 



Cyprinodon dearbomi Meek 

 106. Teeth simple, conical, in two series at front of both jaws; diameter of 

 eye greater than length of snout; interorbital flat; maxillary and 

 anterior edge of preorbital oblique, the upper corner farther for- 

 ward than lower; no angular pocket formed at dorsal edge of pre- 

 orbital; dorsal origin equidistant between midcaudal fin base and 

 front of margin of eye; anal origin very slightly closer to rear margin 

 of eye than midcaudal fin base; anal origin behind a vertical line 

 through dorsal origin; caudal fin rounded; gill rakers short, about 

 10 on lower part of first gill arch; the row of scales along middle of 

 sides much larger than those above and below this row; dorsal rays 

 i, 12; anal iii, 7; pectoral rays 15-15; pelvics 7-7; scales 32; scales 

 before dorsal 9 + 3 or 4 enlarged ones on top of head; scales in 

 zigzag row around caudal peduncle 14, and 8 from dorsal origin 

 to anal fin base; about 12 scales on breast in front of pelvics, the 

 middle row not regularly placed and not enlarged. 



Hubbsichthys laurae, new genus and species 



