ART. 7 



NEW SIAMESE FISHES SMITH 



23 



Fins: Dorsal formula iv,14; origin of dorsal over ninth and 

 tenth scales of lateral line, slightly posterior to that of ventrals, and 

 midway between tip of snout and base of middle caudal rays ; dorsal 

 eniarginate, the branched rays becoming gradually shorter, last ray 

 slightly produced, shortest ray one-third length of first; fourth 

 simple dorsal ray denticulated, very stout and strong, its length with 

 soft tip 1.6 in depth of body; length of dorsal base 1.6 times head; 

 caudal fin broad, forked, lobes pointed, length of fin nearly equal to 

 dorsal base; origin of anal under seventeenth scale of lateral line, 

 anal rays iii,6, third simple ray osseous, strong, its length less than 

 that of similar dorsal ray, border of fin rather deeply 

 emarginate, the last ray 0.4 length of first branched 

 ral ; ventrals extending beyond vent, equal to pectorals 

 and somewhat shorter than head. 



Figure 11. — Scaphognathds stbjnegeri 



Color: Silvery, black pale green, scales of back and sides with 

 dark green base. 



Type. — A specimen 22.5 cm. long taken in the Mekong Kiver near 

 Ban Mekong, Northeastern Siam, February 24, 1929. Cat. No. 

 90303, U.S.N.M. 



Remarks. — This species is apparently rare. In extensive collecting 

 in the Mekong where it forms the boundary between Siam and 

 French Indo-China, only a single specimen was obtained. 



Named in honor of Dr. Leonhard Stejneger, head curator of bi- 

 ology in the United States National Museum. 



