KO. 4 WILSON: PARASITIC COPEPODS 27 



Cypselurus callopterus (Giinther), at Charles Island, and thus con- 

 firms Heller's species, adding a new host and locality. The excel- 

 lent description of the species in the reference given above was trans- 

 lated by the present author and published in Proceedings U. S. Na- 

 tional Museum, vol. 28, p. 602. The present specimens conform to 

 that description in every particular. 



Caligus latifrons Wilson 

 Caligus latifrons Wilson, Proc. U. S. Nat. Mus., vol. 28, p. 587, pi. 12, figs. 140-149. 



A single female was taken from the flying fish, Cypselurus cal- 

 lopterus, in company with the 3 females of C. isonyx just mentioned. 

 When the type of this species was described from the Woods Hole 

 area the host was unknown, and it has so remained. The present 

 specimen supplies a definite host as well as a new locality. 



Caligus lunatus Wilson (plate 3, fig. 5) 



Caligus lunatus Wilson, Results Swedish Zool. Exped. to Egypt, No. 26B. p. 4, 

 pi. 1, figs. 7-12; pi. 2, figs. 13-17. 1924. 



A single male was found on the gills of the yellowtail, Seriola 

 dors alts (Gill), at Bahia Honda, Panama. The original types were 

 taken from another species, aurovittatus, of the same genus of fish 

 captured in the Red Sea. Although this new locality is so far re- 

 moved from the original one there is no doubt of the identity of the 

 specimen. 



Caligus mutabilis Wilson 



Caligus mutabilis Wilson, Proc. U. S. Nat. Mus., vol. 28, p. 573, pi. 8, figs. 91-102. 



One male and four females were found on the skin of a Spanish 

 mackerel, Scomberomorus maculatus , at White Friars, Mexico. This 

 species has not before been found outside the Woods Hole area 

 where it was originally discovered, and the host as well as the lo- 

 cality is new. 



Caligus aliuncus Wilson (plate 3, figs. 4, a-f.) 

 Caligus aliuncus Wilson, Proc. U. S. Nat. Mus., vol. 28, p. 576, pi. 9, figs. 103-111. 

 A single male was taken from the skin of a yellowtail, Seriola 

 dorsalis (Gill), and six males from the skin of an oceanic bonito, 

 Gymnosarda pelamis (Linnaeus), both from Tagus Bay, Albermarle 

 Island. Females of this species were found upon the skin of a bonito 

 at the Dry Tortugas by Dr. Planter, but these are the first males 

 to be discovered. The correspondence in the detail of the appendages 



