102 bulletin: museum of comparative zoology. 



Head 3.75 ; depth 2 (average); D. 11 ; A. 33-35. 

 Form very deep, compressed. Occipital process narrow, long. 

 No caudal spot ; a well-defined, narrow, but very long humeral spot reaching 

 from above the third to above the ninth scale of the lateral line. 

 Many specimens, 55-92 mm. Tabatiuga. 



Moenkhausia jamesi, sp. nov.i 



Head 4 ; depth 2.2 ; D. 11 ; A. 33-35. 



Deep, compressed. Occipital process moderate. 



A dark, vertical caudal spot on base of all but the outermost rays, not continued 

 on middle rays. A silvery lateral band half as wide as eye. An ill-defined, verti- 

 cal humeral spot of scattered cells over the space between fourth and seventh scale 

 of lateral line. No other dark markings. Iridescent silvery and brassy (except 

 in a vertical area, three scales wide and about six high, beginning at the third scale 

 of the lateralline). 



rive specimens, Ija Obidos, Lago do Maximo, Tajapuru. 



Monkhausia comma, sp. nov. 



This species is readily distinguished by the elevated dorsal and peculiar hiumeral 

 spot. 



Head 3.4 ; depth 2 -F ; D. 11 ; A. 26. 



Deep, compressed, subrhomboidal, the anal basis much steeper than the predor- 

 sal profile. 



A well-defined horizontal, comma-shaped humeral spot above the first seven 

 scales of the lateral Hue ; a very narrow, silvery lateral line ; upper posterior parts 

 of the iuterradial membranes of dorsal dark, other fins hyaline. - 



Two specimens, 77 mm. Cudajas. 



Moenkhausia justae, sp. nov.2 



It differs from jamesi in having a tooth on the maxillary, the tooth 4-or 

 5-poiated ; four teeth on each side of the lower jaw. 



A. 31 ; scales 7-36-6; the second preorbital much. nsLrrowev than in M. Jamesi. 

 One specimen, 60 mm. from Dr. Justa through Major Cotinho. 



Moenkhausia melogrammus, sp. nov. 



Readily distinguished by the depth and by the black line along base of anal. 

 Head 4 ; depth 2.5; D. 11 (divided ray counted as 2) ; A. 26. 

 Compressed, dorsal and ventral outlines nearly equal. 



1 For William James, a member of the Thayer Expedition. 



2 For Dr. Justa. 



