NATURAL SCIENCES OP PHILADELPHIA. 219 



Hypsypops rubicundus Gill, Proc. Academy of Natural Sciences of Phila., 



vol. xiii. p. 165, 1861. 

 Parma rubicunda Giinther, Catalogue of the Fishes in the British Museum, 



vol. iv. p. 58. 

 This species, which has only twenty-eight transverse rows of scales, has 

 been referred by Dr. Giinther to his genus Parma, characterized by having 

 the scales " in more than thirty transverse series," thus distinguished from 

 Glyphidodon, which has the " scales in 30 or less transverse series." It is ; 

 however, due to Dr. Giinther, to add that he was logically correct from the 

 data in text in making such an approximation, the species having been truth- 

 fully affirmed by Dr. Girard to have twenty longitudinal rows ; but no men- 

 tion was made of the number of transverse ones. The species is, however, 

 distinguished by the comparative longitudinal extension of the scales, which 

 is accompanied by a less number compared with the longitudinal rows than 

 might have been expected. On the other hand, Dr. Giinther was logically in 

 error in giving the new name Parma to his genus, as he supposed the type 

 and only species which originally served for Hypsypops was a true representa- 

 tive of the former genus ; and the latter name in such a case would, of 

 course, have had to be retained. The characters on which Hypsypops was 

 founded were certainly quite different from those serving for Parma; which 

 were the most valuable is not for the reviewer to decide. As the two types, 

 however, belong to different genera, Parma should be retained for the species 

 having its characters. 



The figure accompanying Girard's description is incorrect as to the form 

 of the dorsal and anal fins and the size of the opercular scales. The fins are 

 acutely produced in advance of the middle, and emarginated behind, while 

 the scales of the operculum are rather smaller than those of the sides. The 

 number of transverse rows of scales is correctly given. 



Genus EUSCHISTODUS Gill. 



This genus, as already remarked, has the physiognomy much like that of 

 Hypsypops and Pomataprion, but is distinguished from them by the deeply 

 grooved and notched teeth, and is, perhaps, really more nearly allied to 

 Glyphidodon. Two species are found along the Western Coast of America, and 

 a third species, closely related to one of the former, is found on the opposite 

 side of the continent. 



Edschistodus concolor Gill. 



Euschistodus concolor Gill, Proc. Academy of Natural Sciences of Phila.. 



1862, p. 145. 

 Glyphidodon concolor Giinther, Catalogue of the Fishes in the British Muse- 

 um, vol. iv. p. 37. 

 This species, which is very distinctly banded in youth, loses its bands in 

 old age, and becomes of a uniform chocolate or purplish-brown, with a 

 brown breast and abdomen. 



A species very nearly related to E. concolor, having almost exactly the same 



4 

 proportions, number of rays (D. XIII. 12. A. II. 10. P. 18.), scales, (26 ), 



9 

 &c, is found on the eastern coast of the isthmus, one specimen from As- 

 pinwall having been sent to the Smithsonian Institution by the Rev. Mr. 

 Rowell. The color is purplish-brown, dotted with green on the centre of each 

 scale, and with the throat and abdomen covered with a lake-colored coat. 

 The teeth are smaller, there being twenty-one or -two on each side of the up- 

 per jaw, seven of which are in the deflected portion behind; and in the lower 

 jaw there are about twenty-five on each side. The anal fin has its produced 

 portion rounded, rather than angular, as in E. concolor : and in the specimen 



1863.] 



