FRESH-WATER FISHES OF SIAM, OR THAILAND 



145 



as long as head ; caudal as long as head, deeply forked, lobes pointed, 

 anal rays iii, 5, longest equal to head less snout ; ventrals arising under 

 eighth or ninth scale of lateral line, rays i, 8, longest ray 1.3 in head ; 

 pectorals equal to ventrals, not quite reaching ventral base, rays i, 15. 

 Coloration : Upper parts reddish brown, below silvery white ; each 

 scale of back and side with a round, dark brown spot at base, the spots 

 forming faint longitudinal lines of which three or four along middle 

 of side are the most distinct ; an obscure dark blotch on caudal peduncle 

 near base of caudal fin ; dorsal fin with blackish edge and blackish mem- 

 branes ; caudal fin dusky ; other fins plain. 



v/.' 







s^^^" 



""^S;^.. 



Figure 19. — Cyclocheilichthys coolidgei, new species: Type (M.C.Z. No. 35519). 



by Mrs. Aime M. Awl. 



Drawn 



Type and paratypes. — The type, an ovigerous female, 10.6 cm. long, 

 collected April 27, 1937, by the Harvard Primate Expedition at 

 Chiengmai, Northern Thailand, is in the Museum of Comparative 

 Zoology (M. C. Z. No. 35519). Sixteen other specimens, 6.8 to 10.8 

 cm. long, taken at the same time and place, are paratypes. Those in 

 the U. S. National Museum are U. S. N. M. Nos. 118452, 118453. 



Remarks. — This is a very small species, reaching full maturity and 

 spawning when less than 7 cm. long. The maximum size among the 

 specimens in hand is 10.8 cm. The smallest is a male 6.8 cm. long with 

 well -developed gonads. 



This species is close to C. armatiis. Agreement is seen in the number 

 of scales in the lateral and transverse series, in the single small maxil- 

 lary barbel, and in the fin formulae. Differences are chieflj^ in the body 

 proportions and in the number of circumpeduncular scales. In C. 

 arinatus the body is deeper and the head is longer, the caudal peduncle 

 is deeper, and there are always 16 circumpeduncular scales as against 

 an invariable count of 18 in the present species. 



Named in honor of Harold J. Coolidge, Jr., leader of the Harvard 

 Primate Expedition, who made the interesting collection of fishes in 



