66 Proceedings of the Biological Society of Washington. 



Umbra pygmaea (De Kay). Eastern Mud Minnow. 

 Delaware basin in Bucks, Delaware and Philadelphia Counties. Shu- 

 feldt recently describes U. pygmcBa bilineata as a new form, from the 

 tributaries of Chesapeake Bay, which I have discussed elsewhere.' 



POECILIID^. 

 Fundulus heteroclitus macrolepidotus (Walbaum). Mummichog. 

 Delaware basin in Bucks. Delaware and Philadelphia Counties. 



Fundulus diaphanus (Le Sueur). Barred Killifish. 



Delaware basin in Bucks, Berks, Chester, Delaware, Lehigh, Mont- 

 gomery, Northampton and Philadelphia Counties. 



Susquehanna basin in Berks, Center, Columbia, Dauphin, Lancaster, 

 Lebanon, Snyder and York Counties. 



Fundulus diaphanus menona (Jordan and Copeland). Menona Killifish. 

 My examples from the Allegheny River near Warren and at Erie. 



BELONIDiE. 

 Strongylura marina (Walbaum) Green Gar. 

 Delaware basin in Bucks, Delaware and Philadelphia Counties. 

 Susquehanna basin in Lancaster and York Counties. 



Strongylura acus (Lac6p6de). Houndfish. 

 A single example in the Academy obtained by E. D. Cope in the lower 

 Susquehanna, within our limits, is an addition to the State's fauna. No 

 exact locality is given. The specimen is 667 mm. long and still in good 

 preservation. Comparison with Massachusetts and Italian material reveal 

 all its characters in harmony. As the species enters our limits by way of 

 Chesapeake Bay it may occur casually in any of the other large rivers 

 tributary. I have, however, not certainly secured it in the Delaware. 



ATHERINID^. 

 Labidesthes sicculus (Cope). Brook Silversides. 

 My material from the Youghiogheny River and Erie. 



PERCOPSIDiE. 



Percopsis omiscomaycus (Walbaum). Trout Perch. 



I have this interesting fish from the Jordan Creek in Lehigh County, the 



only locality in the Delaware basin. ^ In the Ohio basin it is recorded from 



the Monongahela by Evermann and Bollman,^ and French Creek above 



Frenchtown, by McConnell.^ 



iCopeia, No. 50, Oct. 26, 1917, pp. 94-96. 

 aProc. Acad. Nat. Sci. Phila., 1917, p. 119. 

 3Ann. N. Y. Acad. Sci., Ill, 1883-5 (1886), p. 339. 

 4Rep. Com. Fisher. Pa., 1905, p. 178. 



