A NEW SPECIES OF AKGULUS. WITH A MORE COMPLETE 

 ACCOUNT OF TWO SPECIES ALKEADV DESCRIBED. 



By Charles Branch Wilson, 



Depurtment of Bloloff;/, Stale XomixJ SrJionl. Wcufjield, Mas.-<, 



In u paper already published in these Proceedings" four new species 

 of Argulus were described. But the diagnosis of each was necessarih' 

 very lirief and only specific differences could be noted. Such accounts 

 answer very well for preserved material, and may be allowed to stand 

 until further information is obtained from a study of living specimens. 

 But as soon as such information is olitained it becomes expedient to 

 gi^e a more detailed description together with as much of the habits 

 and mode of life as may be of vakie. 



Such an attempt has been made in the present paper upon two of 

 the species previously described, A. ain<nlv(iint.s and ^1. rcrsicolor^ the 

 only ones which have been obtained alive. In addition a diagnosis is 

 given of a third species which proves to be new. 



ARGULUS AMERICANUS Wilson. 



Arfjulus nmericaniis Wilsox, Proi-. U. S. Xat. Mus., XXV, p. 718. 



Much of the anatomy of this interesting species has already been 

 given in the paper referred to, but it was disconnected and min- 

 gled with that of many other species. It is here gathered together 

 and completed and suppl'.mented by an account of the development. 



The species was obtained b}' Prof. Jacob Reighard at Ann Arbor, 

 Michigan, from some Amia calva kept in aquaria and was sent to the 

 author in the winter of 1901-2. It was diagnosed as a new species 

 and described supposedly for the first time. 



But shortly- afterwards a manuscript upon The Yermine and Crus- 

 tacean Parasites of Fresh-Water Fishes, by Dr. R. R. Curley. was 

 sent to the author from the U. S. Fish Commission. This manuscript 

 was evidently prepared with considerable care and labor about ten 

 3'ears ago, but has never been published. 



In it are included two new species of Argulus, one of which is evi- 

 dently the same as A. americamts, since it corresponds in every detail. 



«Proc. V. S. Nat. Mus., XXV, pp. 635-742. 



Proceedings U. S. National Museum, Vol. XXVII— No. 1368. 



tiL'7 



