124 SILtJRID^. 



The height of the body is one-sixth of the total length (without 

 caudal), the length of the head rather more than one-fifth ; head 

 much depressed and broad, its greatest width being four-fifths of its 

 length. Eye small ; its diameter is one-third of the extent of the 

 snout (which equals the -nddth of the interorbital space), and two- 

 sevenths of the postorbital part of the head. The lower jaw is a 

 little shorter than the upper ; the band of intermaxillary teeth is six 

 times as broad as long. Dorsal fin with the spine feeble, longer than 

 high ; the base of the anal is a little shorter than that of the dorsal, 

 and its rays do not extend quite so far backwards as the adipose fin. 

 Pectoral as long as the head without snout ; its spine is three-fourths 

 as long as the fin. Ventral shorter than pectoral. No porus axillaris. 

 Dark brown, with indistinct black spots ; the dorsal and anal fins 

 and the lower parts appear to have been ruddy during life. 



Bahia. 

 a~d. From 6 to 10 inches long. From Dr. 0. Wucherer's Collection. 



1 8. Pimelodus godmanni. 

 D. 1/6. A. 13. P. 1/8. V. 6. 



Head covered with soft skin above ; occipital process triangular, 

 much longer than broad, not reaching the basal bone of the dorsal 

 spine. Adipose fin very long, one-third of the total length (without 

 caudal) ; its distance from the dorsal is one-third of its own length. 

 The maxillary barbels extend to the origin of the adipose fin, the 

 outer ones of the mandible to the root of the pectoral. 



The height of the body is one-sixth or rather more than one-sixth 

 of the total length (without caudal), the length of the head one- 

 fourth or somewhat less than one-fourth. The lower jaw is but little 

 shorter than the upper ; the band of intermaxillary teeth is about 

 six times as broad as long. The chameter of the eye is two-fifths of 

 the width of the interorbital space. Dorsal fin with the spine very 

 feeble, rather higher than long. Pectoral spine serrated interiorly 

 and granulated exteriorly, half as long as the head, or even still 

 shorter. No porus axillaris. The anal fin does not extend quite to 

 the vertical from the end of the adipose fin if laid backwards. 

 Caudal fin cleft nearly to the base, its lobes being of the same length, 

 one-sixth of the total. Coloration uniform ; dorsal fin with the usual 

 whitish cross-band. 



Guatemala, Mexico. 

 a-e. Adult and half-grown. Lower Vera Paz. From the Collection 



of Messrs. Godman and Salvin. 

 d-e. Adult (12 inches long). Eio Motagua. From the Collection 



of Messrs. Godman and Salvin. 

 /, g-h. Half-grown. Mexico. Purchased of M. Salle. 



19. Pimelodus micropterus. 

 D. l/(>. A. 13. P. 1/8. 

 Head covered with soft skin above ; occipital process styliform, 



