GILBERT AND STARKS — FISHES OF PANAMA BAY 



141 



In the adult, the preorbital is very wide, equaling or exceeding the diameter 

 of the eye; the interorbital 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 mouth. 

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

 of trunk. 



Measurements in Himdredths of Leiigth without Caudal. 



Length without caudal expressed in nini. 



Head 



Depth 



Orbit 



Interorbital 



Preorbital at end of maxillary 



Longest dorsal rays 



Longest anal rays 



Length of pectoral 



Length of ventral 



Upper lobe of caudal 



Height of caudal peduncle 



Scales along middle of body 



122 



33J 

 61 



H 



I2i 



24 

 23 

 30 

 30 

 30 



i6i 



27 



121 



33 



55 



9 



12' 



5 



24 



24 



29 

 29 

 30 

 16 



27 



263. Pomacentrus gilli sp. nov. 



Plate XXII, Fig. 44. 



Very closely related to P. rectifreenum, but differing constantly in the 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. Each of the scales on back and sides has a distinct black edge. 

 The vertical fins and the ventrals are black, or in some specimens 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 

 base 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 spot. These are fainter in adults, but were not wholly lost in any of our 

 sjjecimens. 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 fin. 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 U, 1903. 



