U. S. NATIONAL MUSEUM 



PROCEEDINGS. VOL. 94 PLATE 21 



Species of Argulus 



19, 21, Argulus varians Bere: 19, Respiratory areas; 21, ribs of sucking cups. 



20, 22, Argulus megalops Smith: 20, Respiratory areas; 22, ribs of sucking cups. 

 2'i,2S, 27,29, Argulus americanus Wilson: 23, Respiratory areas; 25, first and second 



antennae; 27, ribs of sucking cups; 29, accessory sex modifications on 

 legs of male. 

 24, 26, 28, 30, Argulus maculosusV^ihon: 24, Respiratory areas; 26, first and second antennae; 

 28, ribs of sucking cups; 30, accessory sex modifications on legs of male. 

 31-33, Argulus paulensis Wilson: 31, Respiratory areas of male; 32, abdomen of 

 male; 33, abdomen of female. 



