174 



PROCEEDINGS OF THE NATIONAL MUSEUM 



U.S.N.M. No. 121630, 37 specimens, 40 to 106 mm., Rio Socuy, 3 km. above 

 mouth, February 24, 1942. 



U.S.N.M. No. 121631, 46 specimens, 13 to 48 mm., Rfo Machango, 20 km. 

 above bridge, south of Lagunillas, March 21, 1942. 



U.S.N.M. No. 121629, 57 specimens, 12 to 106 mm., Lago Tul6 about 75 km. 

 vpest of Maracaibo, March 1, 1942. 



U.S.N.M. No. 121624, 3 specimens, 110 to 140 mm., Lago de Maracaibo, 7 km. 

 south of Maracaibo, March 6, 1942. 



U.S.N.M, No. 121635, 4 specimens, 14 to 34 mm., pond tributary to Rfo G6, 

 near Rosario, March 8, 1942. 



U.S.N.M. No. 121619, 15 specimens, 15 to 170 mm., Rfo Negro below mouth 

 of Rfo Yasa, March 2, 1942. 



U.S.N.M No. 121623, 16 specimens, 17 to 96 mm., Rfo Palmar at bridge 

 70 km. southwest of Maracaibo, March 6, 1942. 



U.S.N.M. No. 121621, 28 specimens, 10 to 143 mm., Cidnaga del Guanavana 

 about 10 km. north of Sinamaica, March 11, 1942. 



U.S.N.M. No. 121622, 49 specimens, 30 to 171 mm., caflo K mile west of 

 Sinamaica, March 11, 1942. 



Table 20. — Measurements and counts made on species of Petenia {all measurements 

 expressed in hundredths of the standard length) 



Characters 



Holotype 



Paratype 



kraussi 



Maracaibo 



Basin, 

 Venezuela 



Standard length in millimeters 



Length of head 



Greatest depth of body 



Length of snout 



Diameter of eye 



Width of interorbital space 



Least width of preorbital 



Postorbital length of head. 



Snout tip to rear end of maxillary 



Snout to nostril 



Eye to nostril 



Length of caudal peduncle 



Least depth of caudal peduncle 



Length of fifth dorsal spine 



Length of last dorsal spine 



Longest ray of pelvics.. 



Longest ray of pectorals 



Distance out that caudal fin is scaled basally 



Longest caudal fin ray 



Dorsal rays 



Anal rays 



Pectoral rays _ 



Pelvic rays 



Branched caudal fin rays 



Scale rows below lateral line 



Scales from dorsal origin to lateral line 



Scales from pelvic base to lateral line 



Pores in lateral line 



Scales between lateral lines.. 



Scales from base of last dorsal spine to lateral line and on base of 



dorsal. 



Zigzag row of scales around caudal peduncle 



137.0 

 37.9 

 43.1 

 14.6 

 8.61 

 10.2 

 4.89 

 15.7 

 24.1 

 10.9 

 3.65 

 17.7 

 14.2 

 12.4 

 12.4 

 31.0 

 21.5 

 13.9 

 25.5 

 XV, 13 

 V, 9 

 ii, 13-ii, 13 

 I, 5-1, 5 

 14 

 32 

 6 

 12 

 18+13 

 2 



5+2 

 20 



65.0 

 40.0 

 46.9 

 13.1 

 11.5 

 9.23 

 4.62 

 16.9 



3.08 

 14.2 

 13.8 

 16.5 



31.5 



24.9 



11.5 



26.2 



XV, 13 



V, 9 



ii, 13-ii, 13 



I. 5-1, 5 



14 



32 



6 



12 



18+U 



2 



5+2 

 20 



149.5 

 40.1 

 43.6 

 12.5 

 9.16 

 10.7 

 4.68 

 19.1 

 20.1 

 9.36 

 3.34 

 13.0 

 14.8 

 12.0 

 16.1 

 34. 1 

 30.4 

 21.4 

 31.8 

 XVI, U 

 VI, 10 

 ii, 13-ii, 13 

 I, 5-1. 5 

 14 

 32 

 7 

 13 

 20+10 

 2 



4+2 

 20 



