314 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 92 
having 48 to 44 scale rows between head and base of caudal fin, 8 or 
9 scales behind adipose fin, and 10 or 11 in front of the dorsal instead 
of 51 to 54; 13 or 14 and 12 or 18 respectively. The color patterns of 
intermedius and seyboldi are the same. WN. fasciatus has a broader 
head and more robust body, with 12 or 13 scales behind the adipose 
fin and base of caudal instead of 8 or 9 as in intermedius. Possibly 
the specimen figured by Fowler ?? as WV. taenia is closely related to 
this new species. (Table 2.) 
TABLE 2.—Ceriain counts and measurements* made on three species of 
Nannocharax from West Africa 
| | 
Character N. seyboldi,? new species N. intermedius 3 pi haar 
Standard length in millimeters_ 43.2 32.9 41.0 33. 6 53. 7 48.8 68. 6 
Mengthiot head2--2_ 22. 222222 24.3 26. 7 26.8 25. 6 23.8 DIY 22.9 
Width oPhead ==. 222 sei e226e ipa 12.4 12.4 11.9 11.8 9. 83 13.5 
henethotsnouts. 22.0 -2- eee 7. 64 7. 90 8. 54 7. 44 7.08 6.76 8.74 
Greatest depth of body_-__------ 17.4 21.0 18.8 19.3 18.8 17.0 23.3 
Diameter of eye__.------------- 7.40 8. 51 7.80 8. 93 6. 70 6.35 5. 83 
Width of bony interorbital____- 4.86 5. 48 5.12 5. 36 4. 28 4.51 5. 68 
Postorbital length of head_____- 9, 72 11.5 12.7 11.6 11-2 GE 10.3 
Distance from tip of snout to 
Tear ofmaxillary 22) -- =~ ee 4. 63 5.17 4. 63 4.46 4, 28 4. 51 4.98 
Length of caudal peduncle__---- 16.9 18.2 17.8 19.3 18.2 19.1 16.8 
Least depth of caudal peduncle- 9. 49 9. 73 9. 50 9. 52 9.13 8. 40 10. 2 
Distance from snout to: 
Origin of dorsal fin__------- 44.9 45.3 45.4 43.2 44.0 41.0 43.0 
Origin of adipose fin____-_-- 82.2 84.2 84.9 86.0 80. 0 77.2 80. 2 
Origin: of anal tint == 222 - = 73.1 75.1 74.2 75.0 71. 2 69.3 73. 2 
Insertion of pectoral fin_ _-_- 23:1 24.3 26.6 28. 0 23.7 21.9 20. 2 
Insertion of pelvic fin__-__- 41.2 41.3 46.4 45.5 41.9 41.0 37.9 
Middlevofjanus. 2-22-22 66. 2 62.6 64.8 64.9 60. 6 58. 6 60. 6 
Longest ray of: 
Dorsal finals eee 22.7 24.3 21.9 23. 2 21.8 22.5 21.4 
Amalifinusse ees Ae 16.7 LOS |e eee 16.4 14.3 15.2 16.9 
Pectoralwin@se. a= eee 22.0 24.0 PAL 19.3 19.6 ily AY- Ea} 
Pelvietin 5. - soo eee 28.9 25.5 24. 4 23.5 2320 Zone 29.3 
@audalifin®. 45s 27.8 Pf fin Wn ae a ae | a ee oe 2522 24.8 23.3 
Pectoraliraystss-- = sees 14 16 14 15 13 14 17 
Morsalirayseso ss eee ene ees iii, 10 iii, 10 iii, 10 iii, 10 iii, 10 iii, 10 iii, 10 
SAT ALIrA VS oe cee tenn ee oe iii, 7 iii, 7 iii, 7 iii, 7 ili, 7 iii, 7 iii, 6 
Number of scale rows---------- 43 44 44 44 51 54 47 
Seales above lateral line_-_--_-_-- 44 414 416 4 5144 54g 414 
Seales below lateral line_-_------ 444 4 4 4 54 4h9 444 
Scales in front of dorsal___------ 10 ata il 1 13 12 10 
Seales from adipose fin to base 
of caudal finuass2os ss 9 8 8 8 13 14 13 
1 All measurements expressed in hundredths of the standard length. 
2 For locality data see description. 
3 From Cameroons, vicinity Lolodorf and Etat. 
4 From Cameroons. 
It differs from other species of Nannocharax in the combination of 
fewer scales with the color pattern and a narrow head. 
Named seyboldi after George Seybold, Firestone Plantation, Li- 
beria, who extended much help to Dr. Mann. 
2 Proe. Acad. Nat. Sci. Philadelphia, 1936, p. 270, fig. 20. 
