Durbin : The Expedition to British Guiana. 71 



barely reaching the anal. Pectorals just reaching the ventrals, pec- 

 torals distinctly longer than ventrals. 



Humeral spot very faint, vertically elongated, very near the head. 

 Lateral stripe narrow and very indistinct. Caudal spot intensely black 

 covering the ventral two-thirds of the caudal peduncle, a little nar- 

 rower in front than on the vertical from the origin of the lower caudal 

 lobe, not continued upon the caudal rays. Top of head and dorsal 

 scales very dark, scales of upper half of the sides heavily outlined with 

 dusky. All fin-webs dusky. Numerous chromatophores scattered 

 over the rest of the body, especially large and prominent on the 

 cheeks. 3 Anterior half of anal, base of anal, sides just above the anal, 

 and ventrals reddish ; caudal red or orange to deep yellow, lower lobe 

 often more colored than the upper ; base of dorsal, pectorals, cheeks, 

 and under part of head yellow. 



Hyphessobrycon stictus sp. no v. 



Type, 38 mm. (No. 1197 Carnegie Museum Catalog of Fishes.) 

 Lama Stop -Off. 



Cotypes, 108 specimens. Maduni Creek. (C. M. Cat. No. 



i435> a ~n l > u - Cat - No - Il8 95-) 



Cotypes, 116 specimens, 22-39 mm - Lama Stop-Off. (C. M. 

 Cat. No. 1436, a—z; I. U. Cat. No. 11896.) 



Cotype, 1 specimen. Rockstone. (C. M. Cat. No. 1437.) 



Cotypes, 10 specimens. Christianburg Canal. (C. M. Cat. No. 

 1438, a-e ; I. U. Cat. No. 11897.) 



Cotype, 1 specimen. Canegrove Corner. (C. M. Cat. No. 



H39-) 



Distinguished by distinct humeral spot in a light area ; center of 



humeral spot equidistant from posterior margin of the eye and the 

 dorsal ; no caudal spot. Anal long. Teeth many pointed. 



Head 3.5 to 3.8, depth 2. 75 to 3. 25 ; D. 11, A. 26-31 ; scales 6-33 

 to 35-4; eye 2.25 in head; snout one-half of eye; interorbitals less 

 than the eye, about 2.5 in head. 



Compressed, head at base of occipital process two-thirds to three- 

 fourths the greatest depth. Preventral region rounded, without reg- 

 ular complete series of median scales. Postventral region narrow. 

 Predorsal region rounded, with complete series of nine to eleven 

 median scales. 



3 All specimens at hand were preserved in formalin and so have the black pigment 

 emphasized. 



