152 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



indicates that the first segment includes not only the segment bearing 

 the hook-shaped spine but also the succeeding segment and it is here 

 suggested (fig. 56e) that these are 2 distinct segments. 



The distribution of C. longipedis is intriguing. Originally described 

 from near Aden, it has since been described from Australia, the Revilla- 

 gigedos, the Gulf of Mexico, and now Hawaii. Peculiarly enough, 

 there has, to the author's knowledge, never been a specimen described 

 from either India or Cejdon. Many of the collections of parasitic 

 copepods made from the latter, however, were from market fish, and 

 in a good many cases these collections were from the gill cavities and 

 buccal cavity of the hosts. The only reports giving parasite location 

 of C longipedis indicate that it is found on the external surface of the 

 host. In collections from Hawaiian fishes it was noted that specimens 

 of this species move rapidly and have a tendency to crawl oft' the sur- 

 face of the host when it starts to dry. 



C. rugosus Shiino, 1959d, exhibits characteristics which closely 

 ally it with C. longipedis (maxilla, thoracic legs) , The exact relation- 

 ship, however, can not be presently determined. 



Caligus kapuhili, new species 



Figures 57-59 



Material.— One female (holotype, USNM 112918) from the gill 

 cavity of Chaetodon miliaris Quoy and Gaimard, captured in a fish- 

 trap by Lester Zukeran in Kaneohe Bay, Oahu, Hawaii. One male 

 (allotype, USNM 112919) from the holotype host specimen. One 

 female and 1 male (paratypes, USNM 112920) from the gill cavity of 

 C. miliaris Q. and G., captured in a fishtrap by Lester Zukeran in 

 Kaneohe Bay, Oahu, Hawaii. Two females and 1 male (paratypes, 

 USNM 112921) from the giU cavity of an unknown chaetodontid 

 captured in the Oahu area, Hawaii. One female (paratype, USNM 

 112922) from the gill cavity of Chaetodon jremhlii Bennett, speared by 

 Carolyn Lewis off Rabbit Island, Oahu, Hawaii. One female (para- 

 type, USNM 112923) from the gill cavity of C. miliaris Q. and G. 

 from the Honolulu Aquarium. One female (paratype, USNM 112924) 

 from the gill cavity of C. miliaris Q. and G., captiu-ed in a fishtrap 

 by Lester Zukeran in Kaneohe Bay, Oahu, Hawaii. One female 

 (paratype, USNM 112925) from the gill cavity of C. miliaris Q. and 

 G., captiu-ed in a fishtrap by Lester Zukeran in Kanohe Bay, Oahu, 

 Hawaii. Five females and 2 males (one immature) (paratypes. 



Figure 57. — Caligus kapuhili, new species, dorsal view: a, male; b, female; c, posterior 

 cephalothoracic sinus. Ventral view; d, female free fourth pedigerous segment, genital 

 segment, abdomen, and caudal ramus; e, male, same;/, male fifth and sixth legs; g, female 

 fifth leg; h, caudal ramus 



