8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. S2 



line a few less, 44 to 51 (range of 19 specimens) to base of caudal, 2 

 or 3 similar perforate scales on caudal at its base. Dorsal rays 74 to 

 82. Anal rays 59 to 65. Number of rays in right pectoral usually 9 

 (in 42 specimens), infrequently 8 (in 4) or 10 (in 2); rays in left 

 pectoral usually 11 (in 36), sometimes 10 (in 11), infrequently 9 

 (in 1). Gill rakers on upper limb of first gill arch quite small, 

 usually 3 (in 32 fish), often 2 (in 17), rarely 4 (in 1 specimen) ; 

 quite large on lower limb, nearly always 7 (in 47), infrequently 6 

 (in 3). Body quite deep, greatest depth about 2 in length without 

 caudal. In 29 specimens 101 to 126 mm in total length, the measure- 

 ments expressed as a percentage of the standard length vary as follows : 

 Depth, 48.2 to 55, average 51.4; head, 26.7 to 29.5, average 27.6; 

 maxillary, 10.8 to 12.8, average 11.7; eye, 6.5 to 8, average 7.2; right 

 pectoral, 14.6 to 18,6, average 16.7. In 21 specimens 65 to 99 mm 

 long: Depth 47.3 to 53.4, average 49.5; head, 26.7 to 30, average 28.3; 

 maxillary, 10.8 to 12.9, average 11.8; eye, 7.1 to 8.9, average 8; right 

 pectoral, 15.2 to 19.2, average 17. Width of maxillary and length of 

 filamentous ray of left pectoral differing with size, but apparently 

 not markedly with sex. If there is an average difference in the two 

 sexes in the interorbital width and the extent of the longest ray of 

 the left pectoral, it may be determined only by dissection, my rough 

 data not showing any line of demarcation in these two measurements 

 by which to separate the sexes without dissection. The 50 specimens 

 measured, divided into three groups by size, irrespective of sex, gave 

 the following results: In 15 specimens 111 to 126 mm long — interor- 

 bital, 3 to 4.5 per cent of standard length, average 3.4; filamentous 

 ray of left pectoral, 23.7 to 35.3, average 27.9. In 21 specimens 94 

 to 109 mm long — interorbital, 1.9 to 3.9, average 2.9; longest ray of 

 left pectoral, 22.5 to 36.8, average 28.3. In 11 specimens 65 to 92 mm 

 long — interorbital, 1.6 to 3.2, average 2.1; left pectoral, 21 to 28.5, 

 average 24.9, 



The frequency distribution of the dorsal and anal rays in 50 

 specimens is as follows: 



Dorsal Rays 



Number of rays 74 75 76 77 78 79 80 81 82 



Number of specimens 1 1 3 4 11 12 10 5 3 



Number of rays 59 



Number of specimens 1 



Color. — Nearly uniformly dusky or irregularly shaded with a dirty 

 brown on upper side; two diffuse dark blotches on lateral line, one 

 more or less in front of tip of pectoral, another near ends of vertical 

 fins faintly ocellated; another blotch, faintly ocellated, a little below 

 lateral fine, between the other two blotches, sometimes present; other 



