356 



U.S. NATIONAL MUSEUM BULLETIN 2 02 



Vol. 2 



Color in alcohol. — Body and head of males plain light brownish to 

 tan, with dorsal, anal, and caudal fin dusky to blackish; caudal fin 

 white edged distally; dorsal fin with light or white streaks distally; 

 sides sometimes with traces of 7 or 8 vertical darldsh bars, sometimes 

 traces of 2 lengthwise dark lines about opposite tip of pectoral fin: 

 sides with 2 or 3 rows of small pale-centered spots edged with dark, 

 spaced as part of vertical bars; pectoral fin unspotted; just behind and 

 at upper edge of eye a very small dark spot, another behind lower edge 

 of eye, both may be pale centered with dark edges, in upper part of 

 opercle another small dark spot, all three of these rather tiny spots 

 persistent in appearance but somewhat indistinct. Background color- 

 ation of females light tan, with 4 lengthwise black lines on sides be- 

 ginning about opposite tip of pectoral fin and breaking up into black 

 dots posteriorly; the upper 3 lines are on middle of sides, evenly 

 spaced, whereas the most ventral black line is more widely spaced and 

 runs along lower part of side; dorsal and caudal fins distinctly barred 

 with small black spots; anal fin dusky distally, with a row of spots or 

 transverse dark line basally. Peritoneum blackish and edge of lower 

 lip dusky in both sexes. 



Ecology. — This species was taken in shallow rocky tidal pools left 

 during low tide. 



Remarks. — Day described this species as Salarias andamensis, S. 

 andamanensis and S. striolatus; Gunther as S. caudolineatus. 



Figure 123. — Istihlennius afilinuchalis, new species, holotype, USNM 115421, from Hull 

 Island. Drawn by Dorothea B. Schultz. 



ISTIBLENNIUS AFILINUCHALIS. new species 



Figure 123 



Salarias gibbifrons, Schultz, U. S. Nat. Mus. Bull. 180, p. 284, 1943 (Enderbury, 

 Hull, and Swains Islands). 



Holotype.— VSNM 115421, Hull Island, channel, July 7-17, 1939, 

 Schultz, standard length 88 mm., male. 



Paratypes. —VSNM 115419, Hull Island, reef, July 12-15, 1939, 

 Schultz, 34 specimens, 24 to 61.5 mm.; USNM 111886, Hull Island, 



