io6 Field Columbian Museum — Zoology, Vol. VII. 



4.8 to 5 in head; length of pectoral fin 1.6 to 1.7 in head; pectoral 

 spine 2.4 to 2.5 in head; humeral spine about half length of pectoral 

 spine; ventral fin 1.8 in head; anal fin short, its length 1.6 in head, 

 tips of anal rays not reaching end of adipose fin; caudal peduncle 

 slender, its least depth 2.6 to 2.7 in head; caudal fin deeply forked, 

 its lower lobe the larger. 



Color light olivaceous, more or less silvery; no lateral shade or 

 band; indistinct light dorsal band, tips of dorsal fin dark, all other 

 fins plain. 



Managua (2), 205 to 240 mm. 



Rhamdia nicaraguensis (Giinther). Bagre; Chuchin. 



Pimelodus nicaraguensis Gunther, Cat. , v. 1 2 5 , 1864, Lake Nicaragua. 



Rhamdia nicaraguensis Gill, Proc. Acad. Nat. Sci., Phila. , 1877, 190. 



Head 4.1 to 4.6; depth 4.4 to 4.9; D. 1.6; A. 11 to 13. Body 

 rather slender; head flattish, interorbital width 3.1 to 3.4; snout 

 2.3 to 2.5 in head; diameter of eye 4.6 to 6 in head; upper jaw the 

 longer; gill rakers 3+9; maxillary barbels reaching nearly to or 

 slightly past origin of adipose fin, outer mandibulary barbels to or 

 slightly past base of pectoral spine; dorsal spine weak, its length 3.2 

 to 3.6 in head; length of dorsal fin 1.8 to 1.9 in head, its height 1.5 to 

 1.8; origin of dorsal to end of snout 2.7 to 2.9 in body; adipose iin 

 long, its length 2.3 to 2.6 in body, its height 6.5 to 7 in head; dis- 

 tance from last dorsal ray to origin of adipose fin 3.6 to 4.7 in head; 

 length of pectoral fin 1.6 to 1.7 in head, its spine 2.00 to 2.5; humeral 

 spine about half length of pectoral spine; ventral fin 1.6 to 1.8 in 

 head; anal fin moderate, its length 1.4 to 1.8 in head; tips of anal 

 rays not reaching end of adipose fin, caudal peduncle slender, its least 

 depth 2.6 in head; caudal fin deeply forked, its lower lobe the longer. 



Color light olivaceous, with slight bluish tinge; no distinct lateral 

 band; light band across dorsal very faint; tips of dorsal fin dark, 

 other fins plain. 



Managua (18), 150 to 250 mm.; San Francisco (i), 155 mm. 



Rhamdia barbata sp. nov. Bagre; Chuchin. 



Type, No. 5906, F. M. N. H.; length, 200 mm. ; San Francisco, 

 Nicaragua. 



Head 3.7 to 4; depth 4.3 to 4.6; D. 1-6; A. 10 or 11. Body 

 robust; head large, broad; interorbital width 2.4 to 2.6 in head; top 

 of head nearly flat; snout a. 6 to 2.8 in head; diameter of eye 5 to 

 6.7; upper jaw slightly the longer; gill rakers 3+6; maxillary bar- 

 bels large and long, their tips reaching past middle of adipo.se fin ; 



