CHARACINIDAE FROM VENEZUELA—SCHULTZ 305 
Length of head 28.3 and 28.5; greatest depth at origin of anal fin 
42.4 and 38.6; length of snout 7.94 and 8.00; diameter of eye 6.50 
and 7.28; diameter of orbit 9.52 and 9.46; least width of interorbital 
space 7.14 and 7.46; greatest postorbital length of head 12.1 and 14.0; 
length of mouth from tip of snout to rear of maxillary 13.7 and 14.4; 
length of caudal peduncle from base of last anal ray to midbase of 
caudal fin 9.68 and 9.10; least depth of caudal peducle 9.68 and 8.91; 
length of anal fin base 53.3 and 51.3; distance from tip of supra- 
occipital spine to dorsal origin 22.2 and 22.9; length of longest ray 
of anal fin 14.9 and 15.8; longest dorsal ray 27.5 and 26.4; longest 
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Figure 39.—Roeboides dayi dientonito, new subspecies: Holotype, U.S.N.M. No. 121370, 
63 mm. in standard length. 
pectoral ray 20.6 and 20.0; longest pelvic ray 19.1 and 20.6; length of 
longest ray of upper lobe of caudal fin 26.2 and 25.5, and of lower. 
lobe 26.2 and —-; distance from tip of snout to dorsal origin 51.9 
and 53.6; snout to anal origin 47.9 and 48.2; snout to adipose origin 
88.9 and 88.4; snout to pelvic insertion 37.5 and 37.1; snout to pec- 
toral insertion 27.8 and 28.2; snout to anus 45.2 and 44.6. 
The following counts were made, respectively: Dorsal fin rays u1, 9 
and ii, 9; anal rays iv, 48 and iv, 43; pectoral i, 13-1, 13 and i, 13-4, 13; 
pelvic i, 7-1, 7 and i, 7-1, 7; branched rays of caudal fin 16 and 17; 
number of scale rows crossing lateral line 55 and 58; above lateral 
line to dorsal origin 15 and 15; below lateral line to anal origin 14 
and 14; gill rakers on first gill arch about 6+11 or 12. A summary 
of all counts is recorded in tables 16 and 17. 
Profile from snout to over rear margin of eye nearly straight, then 
abruptly curving dorsally to origin of dorsal fin, thence tapering to 
base of caudal fin; greatest depth of body at origin of anal fin 2% to 
2%, head 3% to 3% all in the standard length; length of anal fin base 
1.8 to 1.9; greatest width of body about equal to least depth of caudal 
