124 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Wilson's 1937 reference ("C. monacanthi") is changed. In an ex- 

 amination of the material identified by Rathbun as Cali(}us productus 

 (USNM 6109) for his 1884 publication, all of the specimens were 

 fomid to belong to C. quadratus Shiino. The female specimen that 

 Wilson (1935a) identified as C. productus (USNM 69776) is not 

 C. productus and does not belong to either of the 2 closely related 

 species here described. The material that Wilson (1937) described as 

 C. monacanthi from Panama Bay (USNM 69867, 69868) is all C. pro- 

 ductus. Shiino (1959b) indicates that the males identified as C mona- 

 canthi by Wilson are C. quadratus and the females C. productus. This 

 indication is presumably based on Wilson's statement (1937, p. 426) 

 that "the terminal segment of the first legs [of the male] carries the 

 usual 3 plumose setae on its posterior margin." This indicates that 

 the males are not C. productus inasmuch as the absence of the 3 setae 

 is characteristic of this species. From an examination of Wilson's 

 material, however, it was found that the males as well as the females 

 do not possess any plumose setae on the posterior margin of the 

 second (terminal) segment of the exopodite of the first thoracic leg. 

 Additionally, all of these specimens have other characteristics that 

 associate them with C. productus. An examination of the type 

 material for C. lobatus Wilson, 1935a (USNM 64059, 64060) supports 

 Shiino's conclusion that this species is also a synonym of C. productus. 



The species described as Caligus dentatus Heegaard, 1962, shows 

 some of the characteristics found in C. productus, particularly the 

 absence of plumose setae on the second segment of the exopodite of 

 the first thoracic leg. Whether this species is synonymous with C 

 productus or is distinct remains questionable, and further, undamaged 

 material should be adequately described, figiu-ed, and compared with 

 associated species before the relationship can be realized. 



For a comparison of C. productus with closely related species found 

 in Hawaiian waters, see the discussion section following the descrip- 

 tion of the following species. 



Caligus bonito Wilson 



Figures 46-48 



Caligus bonito Wilson, 1905b, p. 589, pi. 13, figs. 150-153, text figs. 5, 12-15, 29, 

 30, 35, 37, 38, 40-45.— Rathbun, 1905, p. 89.— Brian, 1924, p. 13.— Wilson, 

 1932, p. 407, fig. 255.— Brian, 1935, p. 188, fig. 14.— Yamaguti, 1936a, p. 8, 

 pi. 5, figs. 69-71; pi. 6, figs. 72-85.— Bere, 1936, p. 582.— Causey, 1953a, 

 p. 4; 1953b, p. 8.— Nunes-Ruivo, 1956, p. 6, pi. 2, fig. a.— Causey, 1960, 

 p. 328.— Shiino, 1960b, p. 527, fig. 1; 1963a, p. 336.— Yamaguti, 1963, p. 50, 

 pi. 56, fig. 3. 



ICaligiis kuroshio Shiino, 1959c, p. 51, figs. 1-2.— Pillai, 1963, p. 80, fig. 9.— 

 Yamaguti, 1963, p. 55, pi. 71, fig. 3. 



