GILUEUT AND STAUKS — FISHES OF I'ANAMA BAY 



141 



fri tilt' adult, the preorhital is very wide, equaling or exceeding the diameter 

 of tiic eye; the iiiterorbital space is very wide and strongly arched; the margin of 

 the preorbital is smooth or nearly so for some distance behind the angle of the n)outh. 

 There are 20 scales traversed by the lateral line, and 26 or 27 in a series along middle 

 of trunk. 



Mc-asinininils in I fundredtlis of Length willwut Caudal. 



127 



32i 



52 



s 



l.cnjjth without caudal expressed in mm 



Head 



Depth 



Orl)it 



Interorbital 



Preorbital at end of maxillary 



Longest dorsid rays 24 



Longest anal rays ■ 22 



Length of pectoral ' 27^^ 



Length of ventral 28 



Upper lobe of caudal 30 



Height of caudal peduncle ^ 16 



Scales along middle of body. 



26 



121 



33 



55 



9 



8i 

 24 

 24 

 29 

 29 



30 

 i6 



263. Pomacentrus gilli sp. nov. 

 Platk XXII, Fui. 44. 



Very closely related to P. redi/ricninn, but differing constantly in tlie uniformly translucent 

 pectorals, the larger eye, the narrower and flatter interorbital space, the narrower preorbital, which is 

 serrated to a point opposite to or in advance of the angle of the mouth, and in the shorter dorsal and 

 anal fins. 



Adult specimens, 14 cm. long, are brownish olive, or darker brown, on head and body, in- 

 cluding the bases of the vertical fins. Rich of the scales on back and sides h;is a distinct black edge. 

 The vertical fins and the ventrals are black, or in some S|3ecimcns yellowish. The pectorals are trans- 

 lucent yellow in life, with the upper rays colored like the rest of the fin. There is a blue spot at the 

 ba.se of the upper pectoral rays. Each scale on the sides of the head and on the base of the anal fin is 

 marked with a pinkish blue sjjot. These are fainter in adults, but were not wholly lost in any of our 

 sijecimens. The smallest specimen procured is 1 1 cm. long. The spots are here more generally dis- 

 tributed. Large spots are present on the scales of the four lower series of the trunk, and on the scales 

 in front of the pectoral base. Small spots are present on the scales of the caudal peduncle and on 

 scattered scales on the top of the head and the sides of the trunk, especially evident above the lateral 

 line. The scaly portions of the caudal, the soft dorsal and the pectorals are also marked with small 

 blue spots less conspicuous than those on the anal hn. A few scales on middle of sides show vertically 

 elongated spots, indicating the probable presence in the young of vertical^ streaks along the rows of 



(19) December 14, 1903. 



