i94i CATALOGUE OF FISHES OF TORTUGAS 227 



Elacatinus horsti (Metzelaar) 



Gobiosoma horsti Metzelaar, Bijdr. Dierk. Amsterdam, vol. 22, 1922, p. 139, with fig. — 



Curacao. 

 Gobiosoma charted Beebe and Hollister, Zoologica, vol. 12, 1931, p. 87, fig. 17 — St. George's 



Bay, Grenada. 

 Gobiosoma (Elacatinus) horsti Ginsburg, Bull. Bingham Oceanog. Coll., vol. 4, art. 5, 



i933> P. 22 - 



A female, 37 mm. long, was taken east of Bird Key reef and Bush Key, at a 

 depth of 13 to 14 fathoms. This species was taken also in the 10-fathom channels 

 within the lagoon. 



D. VII-13; A. 12. Graded in color from black or indigo blue dorsally, through 

 ultramarine blue from upper margin of pectoral base, to the pale ventral surface, 

 the darkest pigment continuing to tips of median rays of caudal; a median dash 

 of sulphur yellow extending from tip of snout nearly to interorbital space; a line 

 of the same color, at its widest exceeding diameter of pupil, running from dorsal 

 surface of eye to caudal base, just above its mid-point. W. H. L. 



Two specimens, 27 and 31 mm. long, are in the collection. Though this species 

 is close to Elacatinus oceanops, it may be distinguished by the subterminal mouth, 

 not decidedly inferior as in oceanops, and by the much narrower and more 

 sharply outlined pale (sulphur yellow in life) line extending from behind upper 

 part of eye to caudal. This line scarcely exceeds the width of the pupil, whereas 

 the less definite pale (light blue in life) line or band in oceanops is almost as 

 wide as the eye where it is broadest. The ventral disk is proportionately much 

 longer in horsti than in oceanops. In the first-named species it extends nearly to 

 vent, and in the second it reaches only about a third to half the distance to vent. 



West Indies and Florida. S. F. H. 



Tigrigobius macrodon (Beebe and Tee-Van) 



Gobiosoma multifasciatum Metzelaar (not of Steindachner), Trop. atl. Vissch., 1919, 



p. 139 — Curacao; Aruba. 



Gobiosoma macrodon Beebe and Tee-Van, Zoologica, vol. 10, 1928, p. 226, with fig. — 



Port-au-Prince-Bay, Haiti. 



Infrequently seen, but scarcely rare. It may be found under Diadema setosum 

 in eroded Orbicella heads. When the covering urchin is taken away, the fish 

 almost immediately slips into a crevice in the coral, but may occasionally be 

 caught by inverting a test tube over it before it finds shelter. 



In 3 specimens the fin formulas were: D. VII-11 or 12; A. 10 or 11. 



Color in life very pale blue, crossed usually by seventeen narrow vertical dark 

 blue or black lines, regularly arranged at distances of about four times their own 

 width. The flesh is translucent, but the internal color pattern is not elaborately 

 developed. A mark is present upon the meninges, however, two blotches occur 

 on the peritoneum (united above), and seven dashes of pigment extend along 

 the vertebral axis. W. H. L. 



