570 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 9* 



to prove that the species cannot be synonyms and that there is no need 

 of waiting foi' the discovery of the niger male. The relative length 

 of the flagellum in the antenna and of the second segment in the 

 second antenna and the comparative size and armature of the end 

 segment in the maxilliped are especially noticeable. 



ARGULUS VARIANS Bere 



Plate 21, Figures 10, 21; Plate 26, Figures 105-107 



Argulus various Bere, 1936, p. 579, pi. 1, figs. 11-16. 

 Argutus megalops Mei:hean, 1940, p. 492 (part). 



Although Meehean claims only that variaiis is "similar to megalops^ 

 except for the great variation in the size of the carapace" (1940, p^ 

 468), he records it as a synonym. Dr. Bere's species was established 

 in the laboratory of the present author and her specimens were care- 

 fully examined before being accredited as new. The following con- 

 siderations led to the separation of vmians from inegalofs and these- 

 still seem sufficient. 



The size and shape of the respiratory areas are shown in figures 

 19 and 20, and while they are similar they are by no means identical^ 

 Figures 21 and 22 show the supporting rods in the sucking cups^ 

 In vai^ns each is made up of four segments longer than wide, sub- 

 rectangular, the basal one as long as the other three. In megalofs 

 each rod is made up of ten segments wider than long and strongly 

 imbricated. The second antennae are 5-segmented and as long as 

 the first pair in variant; they are only 4-segmented in 7negalops but 

 are nearly twice as long as the first pair. The ventral surface of 

 the maxillipeds and the basal plate in varians are covered with scales 

 whose distal margins are divided into four to seven sharp points. In 

 megalops there are no scales, only minute spines. In varians the 

 seminal receptacles are close to the anterior margin of the abdomen 

 and almost touch each other on the midline. In megalops they are 

 larger, farther from the anterior margin, and well separated. All 

 these characteristics are opposed to synonymy with the similarity 

 in the respiratory areas the only point in its favor. The balance of 

 evidence therefore is decidedly against synonymy and varians must 

 be restored to validity. 



ARGULUS MACULOSUS Wilson 



Pi^TE 21, FiGUitis 24, 2(i, 28, .'50 



Argulus maculosus Wilson, 1902, p. 715, pi. 19, figs. 46-50, pi. 26, fig. 82; 1907b„ 

 p. 416, pi. 31, figs. 15-22. (Not Argulus maculosus Meehean, 1940, p. 507.) 



Meehean (1940, p. 468) stated that he was compelled to redescribe 

 this species because no specimens could be found "to match the 



