eigenmann: the cheirodontinje. 



59 



31. Aphyocheirodon hemigrammus sp. nov. (Plate IX, fig. 2.) 

 6802, C. M., type, 45 mm. 6803, C. M., paratypes, twenty-six, largest 48 mm. 



Jaquara, Aug. 18, 1908. Haseman. 

 6804a-d, C. M., paratypes, four; largest 45 mm., Mogy Guassii, Aug. 25, 1908. 



Haseman. 

 6805a, C. M., paratype, one, 39 mm. Riberao Azul, 12 miles from Tiete, Oct. 7, 



1908. Haseman. 

 Range : Tiete basin, Jaquara. 



Head 4; depth about 3; D. 11 rarely 10; A. 23-25 (27 in one); scales usually 

 34, more rarely 36 or 37; eye 2.5-3 in the head, about equal to the interorbital. 



Fig. 18. Aphyocheirodon hemigrammus Eigenmann. a, outline of head; 6, c, variations in the post- 

 orbitals; d, top of head, to show form and location of the fontanels; e, premaxillary;/, maxillary; g, mandible, 

 showing relay teeth at r and p; h, outline of entire mandible, showing teeth-bearing portion at .r. (All figures 

 much enlarged.) 



Compressed, elongate, dorsal and ventral profiles nearly equally arched; pre- 

 ventral area rounded; sometimes a nearly regular median series of twelve scales, 

 sometimes the scales irregular; postventral area rounded; predorsal area rounded, 

 with a median series of about twelve scales; occipital process bordered by two or 

 three scales reaching one-seventh to the dorsal; skull convex above; frontal fon- 

 tanel very small, the f rentals sometimes mesially in contact with the bridge; 



