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PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL.. 79 



its length slightly less than 3 in standard length, its depth 1.7 in 

 its length, and its breadth 1.3 times its depth; snout flat, broad, 

 4.5 in head ; eye small, on dorsal profile, covered with skin, its diame- 

 ter 2.5 in snout and 2 in the broad, flat interorbital space; mouth 

 very large and oblique, gape wide; lower jaw slightly projecting, 

 maxillary long, and extending to within one eye-diameter of lower 

 angle of preopercle, its length contained 1.4 times in head; tongue 

 broad, emarginate; teeth in 2 or 3 rows in each jaw, outer teeth in 

 lower jaw close-set and larger; least depth of caudal peduncle 0.5 

 its length and 2.5 in length of head ; scales thin, ctenoid, uniform in 

 size, completely covering body, 29 in lateral series, 11 in transverse 

 series under second dorsal, head and base of pectorals naked; 

 opercles, cheeks, and jaws with prominent lines of pores. 



Fins : Dorsal rays V-I,7 ; first dorsal spine somewhat shorter than 

 second and third, contained 3.5 in length of head and more than 2 in 

 depth of body; second dorsal elevated, separated from first dorsal 



Figure 18. — Eugxathogobius mickops 



by a space nearly equal to snout, its origin slightly in advance of 

 that of anal, the spine 2.5 in length of head ; caudal rounded, the cen- 

 tral rays equal to depth of body at origin of second dorsal ; anal rays 

 1,6, similar to second dorsal, but the spine somewhat shorter and the 

 soft rays longer; ventrals rather large, extending two-thirds dis- 

 tance to anal; pectorals broad, bluntly pointed, 0.8 length of head, 

 reaching beyond vertical from spine of second dorsal. 



Color: Pale brownish-yellow; body with numerous dark brown 

 narrow, vertical lines corresponding with the posterior margin of 

 scales in transverse series ; fins plain. 



Type. — ^A specimen 33 mm. long over all, 28 mm. to base of caudal, 

 from the lower Bangpakong River, Central Siam, July 1, 1923. 

 Cat. No. 90316, U.S.N.M. 



Remarks. — This striking species is known from a single speci- 

 men obtained from a pongpang net in the swift, tidal part of the 

 Bangpakong River, where small gobies abound in both species and 

 individuals. 



