TUKUGOBIUS 121 



Key to the species of Tukugobius. 



a 1 . Dorsal spines usually seven; a naked area under ventrals; predorsal 



scales 8 or 10 T. bucculentus. 



a 2 . Dorsal spines six or seven. 



b\ Belly partly or entirely naked back to anus; predorsal region naked 



or with very few scales T. carpenteri. 



V. Belly not naked behind ventrals; twelve to fourteen rows of pre- 

 dorsal scales T. philippinus. 



50. TUKUGOBIUS BUCCULENTUS sp. nov. 



PLATE 8, FIG. 4 



Dorsal VII, 1-8 or 9; anal I, 8 or 9; there are from 40 to 

 44 scales in a longitudinal series and 14 to 16 in a transverse 

 series; in one specimen the first dorsal has eight spines and 

 some specimens have irregular scalation; 8 or 10 rows of minute 

 scales before the first dorsal. 



The body little elevated, its posterior half strongly com- 

 pressed, and the depth 4 to 5 times in length; the large head 

 is contained 3.1 to 3.4 times in length, and is broad, with bulging^ 

 cheeks, its breadth 1.6 times to twice its depth; the eyes on 

 top of head, 5 to 5f times in head, 2 to 2.5 times in the convex, 

 broadly rounded snout, and close together, the interorbital space 

 about f an eye diameter; the mouth subterminal or inferior, 

 the lower jaw shorter than the upper, the posterior angle of 

 maxillary not extending to eye, except rarely; the upper jaw 

 has an outer row of enlarged teeth, with a broad band of four 

 or five rows of minute teeth behind it; the outer row in lower 

 jaw is of smaller teeth than the outer row above, with a band 

 of three or four rows behind it ; the caudal peduncle broad, its 

 depth two-thirds to one-half of its own length; under the ven- 

 trals and next its base is a small naked area ; small scales extend 

 forward as far as the region above the gill openings, leaving 

 the entire head, breast, base of pectorals, and region beside the 

 ventrals naked; the second and third spines of first dorsal 

 more or less elongate, with filiform tips, their length equal to 

 or nearly as great as depth; the second dorsal angulate pos- 

 teriorly, its height equal to depth of trunk beneath it; the anal 

 similar in outline but slightly lower; the rounded caudal 

 slightly exceeds pectoral in length and is $ to \ of length of 

 head; the ventrals are typical of the genus and extend much 

 less than halfway to anus. 



The color in alcohol yellowish brown, with a more or less 

 evident, dark, longitudinal line or stripe along the middle of 

 each side; in some specimens there are traces of large dusky 



