306 MEMOIRS OF THE CARNEGIE MUSEUM. 



cc. Sides with numerous spots, those ah.)ng the middle line not forming a Ijand; origin of ven- 

 trals equidistant from caudal and base or middle of the pectorals; distance between the 

 anal and caudal four and three-tenths to five in the length; distance between origin of the 

 dorsal and the caudaj one and three-fourths to one and four-fifths in its distance from 



the snout 27. caliense Eigenmann. 



ccc. Sides plain; maxillary barbel extending beyond the axil; oiigin of ventrals equidistant from 

 caudal and pro-opercle; distance between anal and caudal five and one-half in the length; 

 distance between origin of dorsal and caudal two in its distance from the snout; origin of 

 anal a little in advance of the middle of the dorsal. See also kneri. 



28. latidens Eigenmann. 

 fflo. Teeth sharp-pointed, conical or recurved conical."' 



/. Origin of ventrals nearer to caudal than to tip of pectoral filament, the distance between the ven- 

 trals and caudal two in the distance from the snout; distance between origin of dorsal and 

 caudal two and two-fifths in its distance from the snout. Sides densely covered with small 



spots with only vermiculating light lines between them 29. metae Eigenmann. 



//. Origin of ventrals nearer to tip of pectoral filament than to caudal, usually much further forward. 

 g. Sides plain. 



h. Origin of dorsal nearly over origin of the ventrals, nearer the eye than the tip of the 

 caudal; distance between origin of dorsal and caudal 1.5 or less in its distance from 



the snout, head 4. .5-5. .33 in the length 30. stramineum Eigenmann. 



hh. Origin of dorsal above or a little in advance of the vent, its distance from the caudal 

 1.8 in its distance from the snout; head six times in the length; caudal subtruncate; 



barbels as long as head 31. unicolor Regan. 



hhh. As under /;, caudal emarginate, barbels reaching considerably beyond origin of pec- 

 toral 32. kneri (Steindachner). 



hhlih. Origin of dorsal distinctly behind the origin of the ventrals, much nearer the tip of the 



caudal than the eye striatum, No. 41, which see. 



gg. Sides irregularly spotted, more rarely a lateral band, the spots along the middle of the sides 

 rarely in a distinct series; caudal rounded. 

 i. Maxillary barbels very slender, reaching to the middle of the pectoral rays; eye entirely 

 in the anterior half of the head; origin of dorsal equidistant from tip of caudal and 



opercle; sides and back with moderate-sized dark spots 33. meridae Regan. 



ii. Maxillary barbels not reaching to the middle of the pectoral; eye in middle of the head. 



j. Origin of dorsal, on an average, slightly nearer to the caudal than to the eye; dorsal 



inclusive of the rudimentary rays most frequently 12.5; head a little longer than 



wide; distance between dorsal and caudal 1.5-1.7 in its distance from the snout; 



sides and back with numerous large spots, rarely in rows, the spots largest in the 



larger specimens 34. bogotense Eigenmann. 



jj. Origin of dorsal nearly equidistant from tip of caudal and snout; D. 11.5 or 12.5; 

 head as wide as long; distance between dorsal and caudal 1.4-1.52 in its distance 

 from the snout; sides and back in the largest with numerous irregularly arranged 

 spots about the size of the eye, the spots larger and less numerous in the young. 

 Sometimes nearly plain, sometimes with a lateral stripe. 



35. nigromaculatum (Boulenger). 

 ggg. Sides with distinct longitudinal bands or rows of spots; caudal emarginate, truncate, or 

 truncate-rounded. 

 ^' Not examined in unicolor, kneri, and retropinne. 



