536 BULLETIN 188, UNITED STATES NATIONAL MUSEUM 



(U.S.N.M. No. 119549), 7.1 cm. long, was obtained at the same time 

 and place. 



Remarks. — The type and paratype of this species were examined by 

 Dr. Koumans in 1938 and considered by him as representing an un- 

 (lescribed Acentrogohiu^. For reasons elsewhere given this view can- 

 not be accepted unless the limits of Acentrogohius are extended beyond 

 \ he scope of that genus as set forth in Koumans' various papers. The 

 present fish is much closer to GnathoJepis than to Acentrogohiics; these 

 genera were practically synonymized by Koumans (1935) when he 

 gave, as the only character separating them, the degree of the forward 

 extension of the gill openings, although in his 1931 paper he rejected 

 the suggestion that they are synonymous. It is believed that the vari- 

 ability of the feature relied on by Koumans excludes its use as a diflfer- 

 ential generic character. Specimens in the U. S. National Museum 

 regarded as representative of typical Gnatholepis {deltoides (Seale) 

 from Samoa and thompsoni from Cuba) have the extension of the gill 

 openings as Koumans prescribes for Acentrogohius. 



Named for the writer's daughter, Janet Elizabeth Claudy. 



Genus ZONOGOBIUS Bleeker 



ZonogoUus Bleeker (453), Arch. Neerl. Sci. Nat., vol. 9, p. 323, 1874. (Type, 

 OoMus semifasciatus Kuer.) 



The genus Zonogohius may be recognized by the compressed, scale- 

 less head; scaleless anterior part of the body, which posteriorly is 

 covered with 20 to 30 ctenoid scales in longitudinal series; large, oblique 

 mouth; teeth pluriserial in both jaws, outer row enlarged in upper jaw, 

 inner row in lower jaw, no postsymphyseal or other canines; 6 spines 

 and 8 to 10 branched rays in the first dorsal fin, the median spines 

 being elongate and threadlike ; and anal fin with 8 or 9 branched rays. 



ZONOGOBIUS SEMIDOLIATUS (Cnvier and Valenciennes) 



OoMus semidoliatus Ctn'iEB and Valenciennes, 1837, vol. 12, p. 67 (locality not 



given. 

 Zonogobius semidoliatus Smith, 1934b, p. 325 (Southeastern Siam). 



The wide range of this minute goby of the Pacific and Indian Oceans 

 on coral reefs covers Thailand where, however, it is known only from a 

 few specimens, 14 to 21 mm. long, taken in a tide pool at Lem Sing, 

 Southeastern Thailand. The fish may undoubtedly be found in suit- 

 able localities on other parts of the Thai coast. 



Because of the striking coloration the species may be identified with- 

 out difficulty. The head and body are dark red and the head and 

 anterior part of the body are crossed by 7 to 10 or more whitish black- 

 edged bands ; all the fins except the ventrals are orange or yellow with 

 the rays bearing small dark red spots tending to form lines that are 

 especially well marked on the caudal fin ; ventral fins dark red. 



