14 



BULLETIN- 15 8, UNITED STATES NATIONAL MUSEUM 



ARGULUS LATUS Smith 



FlGtTBE 2 



Argulus latus Smith, Rep. U. S. Gomm. Fish and Fisheries, 1872-73, p. 574, 

 1873.— Rathbun, Proc. U. S. Nat. Mus., vol. 7, p. 484, 1884.— Wilson, Proc. 

 U. S. Nat. Mus., vol. 25, p. 704, pi. 0, figs. 1-4, 1902. 



Locality. — O ne female 

 swimming freely at the sur- 

 face in Vineyard Sound. 



Distribution. — Casco Bay, 

 Me. (Wilson). 



Color (preserved materi- 

 al). — Body a uniform yel- 

 lowish white, turning brown- 

 ish in alcohol. 



Female. — Carapace orbicu- 

 lar, wider than long, scarcely 

 covering the second legs; 

 posterior sinus one-fifth the 

 length of the carapace, as wide as long ; urosome longer than wide, cut 

 one-third of its length, caudal rami basal, posterior lobes acute. Max- 

 illary disks very large, one-fourth the width of the carapace, widely 

 separated; each supporting rod made up of 18 segments, which are 

 transversely lunate. Basal plate of maxillipeds slightly reentrant at 

 the center of the posterior margin, without teeth or lobes. No flagella. 

 Total length, 3 mm. Width of carapace, 2.5 mm. 

 Male. — Unknown. 

 Remarks. — T h i s species 

 may be recognized by its 

 small size and by the absence 

 of teeth or lobes on the basal 

 plates of the maxillipeds. 



Figure 2.- — Argulus latus: a. Female, ventral 

 (drawn by Emerton) ; 6, supporting ribs of 

 sucking disk 



Figure 3. — Argulus catostomi: a. Female, dorsal ; 

 i, supporting ribs of sucking disk 



ARGULIS CATOSTOMI Dana and 

 Herrick 



Figure 3 



Argulus catostomi Dana and 

 Herrick, Amer. Journ. Sci., 

 ser. 1, vol. 31, p. 297, pi. 1, 

 1837.— Wilson, Proc. U. S. Nat. 

 Mus., vol. 25, p. 709, pi. 13, 1902. 



Host and locality. — Outside surface of sucker, Gatostomus com- 

 inersonii., near New Haven, Conn., and at Woods Hole, Mass. 



Distribution. — In fresh water at Warren and Chicopee, Mass. 

 (Wilson) ; at the outlet of Lake Champlain on G atostomus nigricans 

 and G. catostomus (Wilson) ; at Lake Maxinkuckee, Ind., on G. 

 catostonius (Wilson). 



