60 Annals of the Carnegie Museum. 



towards the tip, the rest of anal and the base of dorsal tinged with 



red. Females with yellow on caudal, anal, and dorsal in place of the 



red described in the case of males. The white bar on anal lacking in 



females. 



Hemigrammus iota sp. nov. 



Type, 1 8 mm. (No. 1458 Carnegie Museum Catalog of Fishes.) 

 Gluck Island. 



Cotypes, 4 specimens, 19-21 mm. Rockstone. (C. M. Cat. No. 

 1460, a ; I. U. Cat. No. 11914. ) 



Cotypes, 7 specimens, 18-21 mm. Gluck Island. (C. M. Cat. 

 No. 1459, a-b ; I. U. Cat. No. 11913.) 



Distinguished by vertically elongate black humeral spot, a black I- 

 shaped bar on the caudal peduncle not continued on the caudal rays 

 and not continuous with the narrow blackish lateral stripe. Maxillary 

 with two, four- or five-pointed teeth. 



Head 3.6, depth 3.4; D. 11, A. 15-17; scales 5-30-3; eye 2-J- 

 2.5 ; snout |- of the eye. Interorbitals slightly less than the eye, 2.8 

 in the head. 



Compressed, head at the base of occipital process -| of the greatest 

 depth. Preventral region rounded, usually without complete series of 

 median scales. Postventral region narrow. Predorsal region rounded, 

 usually with complete series of nine to eleven median scales. 



Occipital process one-seventh to one-eighth of the distance from its 

 base to the dorsal bordered by two scales on each side. Interorbitals 

 convex. Frontal fontane much narrower than the parietal, triangular, 

 three-fourths of the parietals without the occipital groove. Second 

 suborbital covering the entire cheek. Snout short, mouth compara- 

 tively large ; lower jaw included only when the mouth is closed. 

 Maxillary . 7 of the eye. Mandible a little longer than the eye, 2 -f 

 in the head. Premaxillary with five, three- to five-pointed teeth in the 

 inner row, and two or three narrow tricuspid teeth in the outer row. 

 Maxillary with one or two broad teeth with four or five points. 

 Dentary with a graduated series of four or five large five-pointed teeth 

 followed by four or five minute conical teeth on the side. 



Gill rakers about 9 + 7. 



Scales cycloid, regularly imbricate, striae few (5-7) variable in 

 number ; no interpolated scales or rows of scales. Anal sheath short, 

 composed of seven scales, covering the base of the first eight or nine 

 anal rays. Caudal scaled. Lateral line with pores on the first six to 

 eight scales. Lateral line very slightly decurved. 



