116 



PROCEEDINGS OF THE NATIONAL MUSEUM 



Table 15. — Armature of thoracic legs I-IV of the female and male of 

 Caligus quadratus Shiino, 1964c 



Hawaiian specimens also differ from C. kuroshio in the nature of 

 other appendages and the body. 



2. Shiino does not figure or describe a break in the plumosities 

 on the inner margin of the first segment of the exopodite of the 

 first thoracic leg in C. quadratus. This break, although slight, is 

 distinct in the Hawaiian specimens. 



Caligus quadratus and the following 2 species of Caligus are diffi- 

 cult to separate. A discussion of the characteristics most readily 

 usable is given following the description of the third species. 



Caligus productus Dana 



Figures 43-45 



Caligxis productus Dana, 1853, p. 1354, pi. 94, fig. 4. — Steenstrup and Liitken, 

 1861, p. 357, pi. 3, fig. 6.— Kr0yer, 1863, p. 138. pi. 3, fig. 4a-i.— Brian, 

 1898, p. 10.— Basse tt-Smith, 1899, p. 452.— Brian, 1906, p. 42.— Fowler, 1912, 

 p. 481.— Wilson, 1913, p. 208.— Brian, 1935, P. 53.— Pearse, 1952a, p. 

 15.— Causey, 1953a, p. 6; 1953b, p. 10; 1955, p. 5.— Shiino, 1959b, p. 

 14, figs. 6-8.— Causey, 1960, p. 329.— Shiino, 1960a, p. 471.— Hewitt 

 1963, p. 65.— Shiino, 1963a, p. 335.— Yamuguti, 1963, p. 58, pi. 73, fig. 

 3.— Kirtisinghe, 1964, p. 53, figs. 25-26. 



Caligus monacanthi Kr0yer, 1863, p. 59, pi. 3, fig. 2a-e. — Wilson 1905b, p. 

 607; 1937, p. 424, figs. 6-19. 



Caligus lobatus Wilson, 1935a, p. I, pi. 1, figs. 1-10. 



Caligus katuwo Yamaguti, 1936a, p. 6, pi. 4, fig. 55; pi. 5, figs. 56-68. — Shiino, 

 1954f, 1 fig.— Nunes-Ruivo, 1956, p. 11, pi. 1, fig. b; pi. 2, fig. b. 



Distribution and hosts. — 37+host records: 



locality 

 Subtropical Atlantic 



hosts 

 Thymnus pelamys [sic] 

 Thynnus 



Coryphaena 

 Monacanthus species 

 Bonito 



Naucrates ductor 

 Neothunnus albacora 



references 

 Dana, 1853 



Steenstrup and Liitken, 

 1861 



Kroyer, 1863 

 Fowler, 1912 

 WUson, 1935a 

 Nunes-Ruivo, 1956 



