Ki i i- : The I'i \ i i i> \'i maim. \ \ : 395 



I'b. Coracoid pn on the breast or belly, the naked 



area more than a third as wide as the distance between the ba 

 the pectoral spines (except in large specimens of armatu I. 

 1. Sides of the body with a median longitudinal stripe. 



d. Eye 1.5 in the snout, 4 in the head, 2 in the interorbital. 

 First two dorsal rays as long as the dorsal spine. Occipital 

 process truncate, about twice as wide at the base as at the 

 tip. Lateral stripe extending from the middle caudal ray 

 forward, distinct and constant. "Head 3.5, depth 2.6 to 



2.8; D. I, 7-8; A. I, 7; V. 6; P. I, 6-7. Lateral plates -." 



20 



nattereri Steindachner. 21. 



dd. Eye 2 in the snout, 3.5 in the head, 1 .3 in the interorbital. First 



dorsal ray only as long as the dorsal spine. The width of 



the occipital process at its base about equal to its length, 



about three times its width at its tip. Lateral band dusky, 



not intense. Head 3.5; depth 3; D. I, 7.5; A. I, 6.5; lateral 



24 



plates — juquiaa von Ihenng. 22. 



22 



ddd. Eye 2-2.25 ' n the snout, 4-5 in the head, 2-2.5 in the inter- 

 orbital. First three to five dorsal rays as long as the dorsal 

 spine. Tip of the occipital process narrow, about 4 in 

 the length, or the width of its base. Lateral stripe wide. 

 variable in intensity, sometimes weak near the caudal, 

 Head 2.6-3.8; depth 2.5 to 3; D. I, 7-8; A. 7-8; P. I, 8-9; 



22-23 



V. 6; lateral plates . 



20 



micro ps Eigenmann & Kennedy. 23. 

 dddd. Eye 2.75 in the snout, 5.5 in the length, about 2 in the inter- 

 orbital. Snout 2 in head; suborbital a little narrower 

 than diameter of eye; barbel nearly or quite reaching gill- 

 opening. Dorsal I, 7; spine about three-fifths length of 

 head, three or four rays longer than spine; edge of fin 

 slightly convex; base nearly equal to distance from adipose 

 fin, which is preceded by three or four median scutes. Anal 

 I, 6. Pectoral spine extending to base of pelvic. Scutes 

 24/22; humeral shields widely separated below, and each 

 separated by one scute from base of pelvic fin. Brownish 

 above, yellowish below; a broad blackish lateral band; fins 

 immaculate. Habitat Colombia (Regan). 



melanotcenia Regan. 24. 

 ddddd. Eye 3 in the snout, 6 in head, 3 in the interorbital; suborbital 1.5 

 the diameter of the eye; barbels reaching gill-opening; occi- 

 pital plate longer than broad. D. I, 7, spine .5 of length of 

 head or less, five or six rays longer than the spine; base less 

 than distance from adipose, which is preceded by three or four 

 median scutes; A. I, 6; pectoral spine to base of pelvis. 



