246 PROCEEiDINGS OF THE NATIONAL MUSEUM vol.94 



interorbital space 7.82 and 8.21; width of gape of mouth 9.13 and 

 9.66; longest (outer) mental barbel 11.3 and 11.1; length of maxillary 

 barbel measured from its anterior base to its tip 22.2 and 20.3; distance 

 between anterior nostrils 5.15 and 5.80; anus to anal origin 11.7 and 

 13.5; tip of snout to anus 4.09 and 5.84; length of base of dorsal fin 

 from bony origin to end of membraneous base 24.8 and 24.6; length 

 of first ray of dorsal fin 20.9 and 22.2; length of last ray of dorsal fin 

 13.5 and 12.5; length of first ray of anal fin 23.9 and 19.3; length of 

 pectoral spme to its fleshy tip 28.2 and 32.4; length of pelvic spine to 

 its fleshy tip 16.5 and 18.4; length of upper ray of caudal fin 18.3 and 

 19.3; length of lower simple ray of caudal fin 21.9 and 25.1 ; length of 

 (longest) branched ray of caudal fin 21.7 and 22.9; length of depressed 

 anal fin 28.3 and 28.5; length of caudal peduncle or distance from base 

 of last anal ray to midbase of caudal fin rays 32.1 and 33.3; least depth 

 of caudal peduncle 3.91 and 4.75; distance from eye to origin of dorsal 

 fin 45.6 and 47.3; distance from eye to origin of anal fin 52.2 and 57.0; 

 distance from eye to insertion of pelvic fins 36.1 and 38.2. 



The following counts were made, respectively: Dorsal rays i, 4; 

 i, 4; i, 5; i, 5; i, 4; i, 4; i, 4; i, 4; anal rays ii, 5; ii, 5; ii, 6; ii, 5; ii, 5; 

 ii, 5; ii, 5; ii, 5; pelvics always i, 5 and pectorals always I, 6; munber 

 of caudal fin rays i+7+i; i+7 + i; i+7 + i; i+8+i; i+7+i; i+7+i; 

 iH-7+i; number of platelets along the lateral line 37; 39; 34; 38; 35; 

 35; 33; number of plates in the dorsal series from origin of dorsal to 

 base of caudal fin 21; 21; 21; 20; 21; 22; 23; number of plates in the 

 ventral series from anus to base of caudal fin 21 ; 20; 20; 21 ; 21 ; 21 ; 21 ; 

 plates behind base of last anal ray to base of caudal 12; 11; 11; 11; 

 12; 13; 13; plates in front of origin of anal fin always 3; number of 

 spines on inner edge of pectoral spine 5; 5; 5; 6; 6; 6; 6. 



Color. — The c*^or pattern consists of four wide black bars, the first 

 through middle of dorsal fin across body, meeting its fellow around 

 the anal origin, thus basally from the first to third dorsal rays the 

 color is white, with a wide white margin posteriorly on the dorsal fin; 

 the second bar is at rear of anal fin but does not extend on that fin; 

 third across caudal peduncle and the fourth across second quarter of 

 the caudal fin; conspicuous black bar near middle front of pectoral 

 fin; basal third of soft rays of pelvics black, the spiny ray pale; a 

 narrow black line across top of head through eyes to base of outer 

 mental barbel; anal fin pale. 



Remarks. — This new species differs from Hoplomyzon atrizona 

 petroleus and Hoplomyzon atrizona atrizona in lacking barbels near 

 front corner of mouth, and in having four black color bars and a black 

 line across top of head. The three plates in front of the anal fin 

 separate it from both species. 



Named sapito after the common name of this species in the Mara- 

 caibo Basin. 



