202 CALIFORNIA ACADEMY OF SCIENCES. 



Chocolate brown, many dark violet spots on back and 

 sides. D. I, 6; A. 12. (Steindachner.) 



XXXIII. STEINDACHNERIA. 



Steindachneria Eigenm. & Eigenm. Proc. Gal. Acad. 2d 

 Ser. i, 137, 1888 (amblyura). 



Type: Steindachneria amblyura E. & E. 



Palatine teeth none; vomerine teeth in one or two 

 patches. Occipital process reaching or almost reaching 

 the dorsal plate. Spines of the dorsal and pectoral short, 

 prolonged in a fleshy ray. No dermal ossification about 

 the head. Adipose fin longer than the anal. Origin of 

 dorsal equdistant from tip of snout and middle of adi- 

 pose fin. Branchiostegals 8-10. 



The species of this genus, three in number, are con- 

 fined to southeastern Brazil. While the smaller species of 

 other genera are usually common to several or all of the 

 rivers of southeastern Brazil, these basins seem to be 

 well enough separated to prevent too ready intermingling 

 of the larger species, and there are consequently differ- 

 ent species in the different rivers. Duopalatinus emar- 

 ginatus, another of the large species, is found in the Rio 

 San Francisco. 



ANALYSIS OF THE SPECIES OF STEINDACHNERIA. 



a. Caudal broadly rounded; teeth of the vomer in two patches; maxillary 

 barbel extending to adipose; postmentals beyond base of pectoral; head 

 lj?-lf in distance from vent to caudal; distance from vent to anal equals 

 4 orbital diameters. D. I, 6. amblyura 148. 



act. Caudal deeply lobed; teeth of the vomer in a single patch; maxillary 

 barbel not extending beyond dorsal; distance of vent from anal li orbital 

 diameters. D. I, 7-8. 



b. Depth of head 2-3 in its length; greatest depth 2-2 J in the length 

 of the head; blackish brown with yellow spots and vermiculations. 



doceana 149. 



bb. Depth of head l-2 in its length; greatest depth 1J in length of 

 head. Maxillary barbel not reaching beyond tip of pectoral; post- 

 mentals to base of pectoral; head 1^ in distance between vent and 

 caudal; brownish, with darker spots. /xn-ahybce 150. 



