80 Lake Maxinkuckee, Physical and Biological Survey 



Rock Bass or Redeye (A7nbloplites i-upestris) . Only two females 

 were found on the Redeye; both were full of ripe eggs; evidently 

 they were hunting for a suitable place to deposit them, and were 

 only using the Redeye as a temporary host. 



The Yellow Cat is the true host of this Argulns and nearly half 

 the fish of that species that were examined yielded specimens of 

 this parasite. 



4. ERGASILUS CENTRARCHIDARUM Wright 



Found on the gill-filaments of the Calico Bass (Pomoxis spar- 

 oides) , the Redeye (Ambloplites rupestris) , the Warmouth 

 (Chaenobryttus gidosus) , the Bluegill (Lepomis pallidus) , the 

 Small-mouthed Black Bass (Microptenis dolomieu) , the Large- 

 mouthed Black Bass (M. salmoides), the Yellow Perch (Perca 

 flavescens), and the Walleyed Pike (Stizostedion vitreum) , and 

 would have been found almost certainly upon the different sun- 

 fishes, had there been an opportunity to examine them. 



■ As its name rightly implies, it is a family rather than a specific 

 parasite, and is very widely distributed, as are the hosts upon which 

 it lives. 



5. ERGASILUS VERSICOLOR Wilson 



Found only on the two species of Catfish (Ameiurus nebu- 

 los2is SiJid A. natalis), the latter of which was the more badly in- 

 fested. This species was not found upon any other fish in the lake 

 although many hundreds of them were searched for it, nor was 

 Ergasilus centrarchidarum, so common on the other fish, ever found 

 on these catfishes. 



E. versicolor has since been obtained from the Channel Cat 

 (Ictalurus punctatus), and the Eel Cat {Ictaluims anguilla) , in the 

 Mississippi River. 



The species is thus distinctively a Catfish parasite in sharp 

 contrast to E. centrarchidarum, which is a Perch parasite. 



The life history of Ergasilus worked out upon these two Maxin- 

 kuckee species, was published in vol. 39, Proc. U. S. Nat. Mus., 

 pp. 313-326, and still stands as the only contribution to the onto- 

 geny of the entire family. 



6. ACHTHERES AMBLOPLITIS Kellicott 



Found on the gill-arches of the Redeye {Ambloplites rupestris) , 

 the Bluegill {Lepomis pallidus), the Small-mouthed Black Bass 

 {Microptertis dolomieu), the Large-mouthed Black Bass {M. sal- 

 moides), and the Walleyed Pike (Stizostedion vitreum). It was 



