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description and figures (1902, pp. 715-716, pi. 19), he seems to have 

 separated the species according to the presence or absence of pig- 

 ment spots. On about one-third of the types of americanus one may 

 note the typical flecks that he indicates as characteristic of maculosus. 

 The remaining vials do contain specimens with the characters 

 outlined above, some of which may be designated as types for the 

 species. There is no such specimen as that from which he described 

 the species and which was probably aberrant. 



ARGULUS MISSISSIPPIENSIS Wilson 

 FlQUKE 41 



Argulus mississippiensis Wilson, 1916, p. 350, pi. 61, figs. 13-15; pi. 62, fig. 21; 

 pi. 63. 



Carapace subcircular, wider than long, alae somewhat truncate 

 posteriorly so that lobes just about reach abdomen; eyes small and 

 widely separated; abdomen one-fourth the total length of the body. 



FiGUBE 41. — Argulus mississippiensis: a, Accessory organs of last three legs of male; 

 6, respiratory areas ; c, ribs of suction cups. 



