COPEPOD PARASITES AND MUSSEI* GLrOCHIDIA ON FRESH-WATER FISHES 365 

 Achtheres corpulentus Kellicott. 



Achlheres corpvlenlus Kellicott, Proc. American Soc. MicroscopistS, vol. i, p. 54, pt. i, fig. 1-3; Wilson, Proc. U. S. Nat. 

 Mus., vol, 47, p. 619. 



Host and record of specimens. — This species has been obtained from Argyrosomus ariedi ia Buffalo 

 Harbor and Niagara River; from A. prognathus in Lake Ontario and Lake Michigan; from A. hoyi in 

 Lake Michigan; and from Coregonus clupeiformis in Lake Erie. 



Achtheres micropteri Wright. 



Achllieres micropleri Wright, Proc. Canadian Institute, n. s., vol. i, p. 249, pi. 2, fig. i-ii; Wilson, Proc. U. S. Nat. Mus.. 

 vol. 47, p. 620, pi. 34. 



Host and record of specimens. — Foimd by Wright on the smallmouth black bass near Toronto, Canada, 

 and by the present author on the same host in the Kankakee River, Ind. ; also foimd upon the large- 

 mouth black bass in the Kankakee River and at Lake Maxinkuckee, Ind., and at Constantia, N. Y, 



Remarks. — On the gills of the largemouth bass this species, together with Ergasilus centrarchidarum, 

 is often associated with glochidia of the Lampsilis group. Thus far none of these glochidia have been 

 found on the gills of the smallmouth bass, but since both of the copepod parasites are found there it is 

 reasonable to believe that future search will reveal some of the glochidia. At all events, the presence of 

 the copepods shows that both bass are good subjects for artificial infection. 



Achtheres lacse Kr0yer. 



Achtheres lactB Kr0yer, Naturhistorisk Tidsskrift, 3 Raekke, 2 bd., p. 348, pi. 17, fig. 6; Wilson, Proc. 17. S. Nat. Mus.. vol. 

 47. p. 622, pi. 35. 



Host and record ofspecintens. — Found originally by Kr0yer in the mouth of a North American perch, 

 which he called " Perca laca, ' ' probably P. flavescens. Eight females were obtained from the gills of the 

 striped bass, Roccus lineatus, in the Potomac River near Washington, D. C. 



Remarks. — If Kr0yer's specimens really came from P. flavescens, they were strictly fresh-water 

 species; the striped bass, on the other hand, goes back and forth from fresh to salt water. This fact of 

 cotuse would make it of no use as a carrier of glochidia; none have ever been found upon its gills nor are 

 they likely to be in the future. 



Achtheres coregoni (S. I. Smith). 



LertuBopoda coregoni STnith. Report U. S. Commissioner Fish and Fisheries for 1872-73, pt. 2, p. 664, pi. 3, fig. 17. 

 Achtheres coregoni Wilson, Proc. U. S. Nat. Mus., vol. 47, p. 623, pi. 36. 



Host and record of specimens. — This species has been found upon the whitefish, Coregontis clupei- 

 formis, in Lake Michigan, upon Argyrosomus artedi in the Niagara River, and upon A. hoyi in Lake 

 Michigan. It has not yet been associated with any glochidium. 



Achtheres ambloplitis Kellicott. 



Achtheres ambloplitis Kellicott, Proc. American Soc. MicroscopistS, vol. i. p. 56, pi. 3, fig. 6, 7: Wilson, Proc U. S. Nat. 

 Mus., vol. 47, p. 626. 



Host and record of specimens. — Found on the red-eye, Ambloplites rupeslris, at Lake Maxinkuckee, 

 Ind., and in the Shiawassee River, Mich., and upon "redfish" at Big Payette Lake, Idaho. 



Remarks. — This species is associated with Lampsilis glochidia on the gills of the red-eye, and its 

 presence indicates that these fish are good hosts for artificial infection, as has been proved by actual 

 experiments. 



LERN^ID^E. 



Lemseocera variabilis, new species. (PI. lxxii.) 



Host and record of specimens. — Ten females were obtained from the scales and flesh of Lepomis 

 pallidus in Whisky Slew, Fairport, Iowa, July 10, 1912, and have received catalogue no. 47727, U. S. 

 National Museum; fifteen females were obtained from the same host in the Mississippi River at Fairport, 

 July 25, 1912, and have received catalogue no. 47738, U. S. National Museum; six females from the 

 same host in McPhersons Slew, Fairport, August 8, 1912, catalogue no. 47739, U. S. National Museum; 

 eight copepodid larvae from the gill filaments of the short-nosed gar, Lepisosteus platostomus, in "Sun- 

 fish Lake," Fairport, July 24, 1914, catalogue no. 47740, U. S. National Museum; five copepodid larvas 

 from gill filaments of the sauger, Stizostedion canadense, in Whisky Slew, Fairport, August 12, 1914, 

 catalogue no. 47741, U. S. National Museum; four copepodid larvae from gill filaments of saucer in Dark 

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