280 PROCEBDIN'GS OF THE NATIONAL MUSSEUIVI vou 94 



lie. Adipose fin well developed, with spine absent or embedded; barbel 

 short, barely reaching to opposite rear margin of lower lip; teeth 

 in outer row of premaxillary broadly unicuspid; pelvics reaching 

 one-half to two-thirds way to anus; pectorals reaching one-third 

 way out along pelvics; no nasal barbel on flap; anus usually a little 

 closer to base of pelvics than base of caudal fin. 



Astroblepus orientalis (Boulenger) 

 116. Adipose fin with an obvious spine and usually connected by a mem- 

 brane to caudal peduncle. 

 12o. Maxillary barbel reaching to gill opening, pelvics extending three- 

 fourths way to anus; pectorals extending two-thirds out pelvics; 

 nasal flap without barbel (Canelos, Ecuador). 



Astroblepus boulengeri (Regan) 



126. Maxillary barbel reaching not more than one-half distance to gill 



opening or to opposite lower lip. 



13a. Pectorals reaching one-third to two-fifths way out pelvics; 



nasal flap with a small barblet; barbel reaching halfway to 



gill opening; pelvics reaching four-fifths way to anus; color 



pattern in young with three pale bars, but in adults reduced 



to a single bar across caudal peduncle (Balsas, Peru). 



Astroblepus supramollis Pearson 



135. Pectorals reaching one-half to four-fifths distance out pelvics; 



nasal flap triangular without barblet. 



14o. A pale bar across caudal peduncle in adults and three in 



young; premaxillary teeth broadly pointed; pelvics reach 



two-thirds way to anus; maxillary barbel reaches to rear of 



lower lip (Rfo Dagua, Colombia). 



Astroblepus trifasciatus (Eigenmann) 

 146. No pale bars on body; teeth pointed; maxillary barbel reaching 

 halfway to gill openings. 

 15a. Lips very thick and wide; pelvics reach three-fourths way to 



anus (Balsas, Peru) Astroblepus labialis Pearson 



156. Lips normal; pelvics reach two- thirds way to anus (Rio 



Dagua, Coloralna) Astroblepus retropinna (Regan) 



106. Insertion of pelvic fins a trifle in front, directly under, or a little behind 

 origin of dorsal fin. 

 16a. First ray of pectorals long, reaching to tips of pelvics or beyond, 

 pelvics long too, the first ray reaching to anus or beyond; adipose 

 fin elongate without a spine or spine completely embedded; teeth 

 on outer row of premaxillary broadly pointed, and in large adults, 

 140 mm. long, some of teeth may be bilobed: maxillary barbel 

 reaching to gill oldening or a little beyond; interorbitJil equal to or 

 a trifle shorter than distance from eye to margin of posterior nostril; 

 anus about one-third to three-eighths closer to pelvic base than to 

 caudal fin base; nasal flap ending in a short barbel (Peru to 



Colombia) Astroblepus longifilis !» (Steindachner) 



166. First ray of pectorals not reaching to tips of first ray of pelvics, 

 usually not more than three-fourths way out pelvics. 

 17a. Adipose fin without spine, or spine completely embedded, or with 

 tip of spine showing. 

 18a. Maxillary barbel reaching to gill opening or beyond. 



» To this species I refer as a synonym A. heterodon (Regan). 



