Xj8 PAPERS FROM TORTUGAS LABORATORY vol. xxxiv 



of body and color, the pectoral had 20 and 21 rays about evenly, and 1 had 22, 

 whereas in 20 specimens of the other species this fin had 18 or 19 rays, except 

 that 2 of 13 specimens of planijrons each had 20. Aside from the rather slender 

 body and distinctive color, leucostictus may be recognized by the stronger serra- 

 tions on the preopercular margin, which is not covered to the edge with scales as 

 in the other species. 



According to Dr. Longley's observations, all the local species deposit their eggs 

 on or in some solid object, to which they become attached by adhesive threads. 

 There they are closely guarded by a parent fish, which apparently always is the 

 male. S. F. H. 



Pomacentrus adustus Troschel 



Pomacentrus adustus Troschel, in von Miiller, Reisen in den Vereinigten Staaten, Canada, 



und Mexico, vol. 3, 1865, p. 633 — Adantic Ocean. 

 Pomacentrus dorsopunicaus Poey, Repertorio, vol. 2, 1868, p. 328 — Havana. 

 Pomacentrus obscuratus Poey, Enumeratio, 1875, p. 101 — Havana. 

 Eupomacentrus diencaeus Jordan and Rutter, Proc. Acad. Nat. Sci. Philadelphia, vol. 49, 



1897, p. 116 — Jamaica. 

 Eupomacentrus fuscus Jordan and Evermann (part not of Cuvier and Valenciennes), Bull. 



U. S. Nat. Mus., No. 47, pt. 2, 1898, p. 1552 — West Indies. 

 Eupomacentrus rubridorsalis Beebe and Hollister, Zoologica, vol. 12, 1931, p. 85, fig. 16 — 



Chatham Bay, Union Island, Grenadines. 



Common about the larger coral stacks. 



Although this species has not always been distinguished clearly from others, it 

 has generally been referred to as Pomacentrus (or Eupomacentrus) fuscus. I 

 think, however, that it is not the Brazilian form described by Cuvier and 

 Valenciennes (Hist. nat. poiss., vol. 5, 1830, p. 432). The true fuscus is a larger 

 fish, commonly attaining a length of 120 to 130 mm., whereas this species scarcely 

 exceeds 100 mm. 



For this northern species, if it be distinct, there is no earlier name than 

 Troschel's, and the identity of his P. adustus with this one must next be deter- 

 mined. On this point it was impossible to obtain light from examination of the 

 type, as it now (May 1935), at least, is not to be found in the Berlin Museum. 

 The published description, however, is conclusive on some points. 



The type had a black spot on the upper side of the caudal peduncle. It there- 

 fore belonged neither to P. leucostictus nor to P. partitus, and Troschel's P. flaui- 

 venter belongs to neither for the same reason. But from the published descrip- 

 tion, P. flaviventer is recognizable. The spotting with bluish white on the head 

 and below the dorsal fin, the dark saddle on caudal peduncle, and the brown 

 color above, passing gradually to yellow below, identify it. 



Now P. adustus can scarcely be the same as P. planifrons. At the time the 

 latter species shows its dark saddle on caudal peduncle, it also shows a dark spot 

 on the dorsal fin and back, which could scarcely have been overlooked. It is also, 

 at least in early life, a yellow fish. By the time its dorsal ocellus and yellow color 

 are lost, it should scarcely show even such traces of blue spotting as Troschel 

 mentions. 



