SOUTH AMERICAN NEMATOGNATHI. 185 



Adipose fin higher than long; occipital process con- 

 tinued to the dorsal plate. Fontanel not continued be- 

 hind the eye. Dentition very weak, disappearing with 

 age. Snout produced. Anal rays 18 to 20. 



ANALYSIS OF THE SPECIES OF C'ONORHYNCIIOS. 



a. Entire postorbital portion of the head granular. No teeth in the lower 



jaw, all the teeth disappearing with age. (Conorhynchos.) 



h. Barbels thin, shorter than the head. Dorsal spine longer than the 



pectoral spine, 1^ in head. Caudal and anal fins emarginate. Width 



of head 2 in its length. D. I, 6-7; A. 18-20. conirostrh 132. 



aa. Postorbital portion of the head smooth, covered with skin; teeth in 



the lower jaw and on the vomer, (subg. ?) glaber 133. 



132. Conorhynchos conirostris. 



Pimelodus conirostris Cuv. & Val. Hist. Nat. Poiss. xv, 204, plate 



436, 1840 (Kio San Francisco). 

 Conostome conirostris Dumeril, " Ichthyol. Anal. 484." 

 Conorhynchus conirostris Bleeker, Nederl. Tijdschr. Dierk. i, 1863, 



102 (name only); Giinther, Cat. Fish. Brit. Mus. v, 135, 1864 



(Rio Cipo, tributary of Kio das Velhas); Ltitken, Vidensk. Selsk. 



Skr, 162, 1875 (Rio das Velhas). 

 Habitat: Rio San Francisco and its tributaries. 



133. Conorhynchos glaber. 



Conorhynchus glaber Steindachner, SB. Ak. Wien, Ixxiv, 1876, 

 Silsswasserfische siidostl. Bras, iii, 79, plate viii (Porto 

 Seguro). 



Habitat: Porto Seguro. 



XXIV. Bagropsis. 



Bagrojpsis Liitken, Dan. Viden. Selsk. Skr. 1874, 32 

 {reinhardti) . 



Type: Bagropsis reinhardti Liitk. 



This genus is very closely related to Pimelodus. The 

 top of the head is striate, entirely covered with skin. 

 There are two moderately large patches of teeth on the 

 vomer and larger patches on the posterior part of the 

 palate. We have not been able to examine the single 

 species. 



