10 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



exist, then the fact that it is the only known host for G. hygomianus 

 supports this point of view (all other species of Gloiopotes are found 

 on biMshes). A. solandri is cosmopolitan in distribution and G. 

 hygomianus has been collected from it (8 collections) in the Atlantic 

 and Indo-Pacific Oceans. 



The remaining 4 species of Gloiopotes are related more closely to 

 each other than to G. hygomianus. Two species {G. ornatus and G. 

 americanus) are found only in the Atlantic, and the other 2 {G. 

 huttoni and G. watsoni) are restricted to the Indo-Pacific. The isti- 

 ophorids from which these collections were made are also divided into 

 Atlantic and Indo-Pacific species. In the Atlantic, G. americanus 

 has been found only on /. americanus (10 collections) and it is the 

 only species of Gloiopotes so far collected from that host. G. ornatus 

 is found on T. albidus (22 collections) and on M. nigricans (10 collec- 

 tions) and is the only species of Gloiopotes from those hosts. In the 

 Indo-Pacific, both G. huttoni and G. watsoni have been collected 

 from T. audax and /. orientalis. In 22 collections from T. audax, 

 14 of these were G. huttoni and 8 G. watsoni, indicating about a 2 : 1 

 prevalence of G. huttoni. In 16 collections from /. orientalis only 4 

 were G. huttoni while 12 were G. watsoni, indicating a 3 : 1 prevalence 

 of G. watsoni. AU 18 collections from the genus Makaira (14 M. 

 mazara and 4 M. indicus) were G. watsoni. 



A single collection of G. huttoni in the USNM from Xiphius gladius 

 collected off Cahfornia is insufficient on which to base any conclusions 

 regarding relationships with this host. I hope that future collections 

 from this host will fill the gap. So far, no copepods have been col- 

 lected from Tetrapturus brevirostris. 



A summary of number of collections of the 5 species of Gloiopotes 

 and then- distribution among the host species is as follows: 



Kecent papers by Hewitt (1964) and Lewis (1967) have alluded to 

 the wide range of intraspecific variation in the genus Gloiopotes. 

 Both of these authors have considered G. huttoni and G. watsoni as 

 synonymous species. Analysis of the 50 collections from the Indo- 



