NO. 3600 GLOIOPOTES — CRESSET 5 



In G. ornatus the bulge is conspicuous, whereas in G. americanus it is 

 only slight (see pi. 1) . The males of these two species can be separated 

 on the basis of leg 5 extending nearly to the end of the abdomen in 

 G. ornatus whereas it extends only slightly beyond the middle of the 

 abdomen in G. americanus (see pi. 2) , 



So far G. americanus has only been recorded from the sailfish 

 Istiophorus americanus with all collections from the Gulf of Mexico 

 except one collection from Stuart, Fla. It may be that this species 

 is restricted to this host. 



Gloipotes ornatus Wilson 



Figures 25-26 



Gloiopotes ornatus Wilson, 1905, p. 127; 1907, p. 699; 1919, p. 315; 1932, p. 415; 

 1936, p. 32.— Rathbun, 1905, p. 93.— Yamaguti, 1936, p. 5; 1963, p. 104.— 

 Rao, 1951, p. 254.— Shiino, 1954, p. 277; 1959, p. 349.— Heegaard, 1963, 

 p. 174.— Hewitt, 1964, p. 95. 



Specimens studied. — Twenty-one collections from Tetrapturus 

 albidus and 6 collections from Makaira nigricans from various M/V 

 Delaware cruises in the western North Atlantic, 1 collection from M. 

 nigricans caught off Beaufort, N.C., and 7 collections in the USNM 

 (including types) from both hosts cited above (5 collections off east 

 coast of U.S. and 2 from Caribbean). 



Body form and ornamentation as in G. americanus. 



The adult females of G. ornatus tend to be larger than those of G. 

 americanus. Total length 11.72 mm (10.50-12.90 mm); greatest 

 width 5.23 mm (4.50-5.70 mm) based on an average of 136 specimens. 



Adult males total length 9.75 mm (9.00-11.10 mm); greatest 

 width 3.93 mm (3.45-4.50 mm) based on an average of 128 specimens. 

 The 5th legs of males extend posteriorly well beyond middle of 

 abdomen (see fig. 26 and pi. 2). 



Since G. ornatus and G. americanus cannot be separated on append- 

 age characters, a description of the appendages of G. ornatus is not 

 given here. The descriptions and figures of G. americanus appendages 

 apply to G. ornatus as well. 



Remarks. — This species cannot be distinguished from G. americanus 

 on the basis of the appendages. However, the adult females can be 

 separated by certain characters of the genital segment and abdomen. 

 In G. ornatus there is a distinct lateral bulbous expansion of the 

 second abdominal segment that is not present in G. americanus. 

 Also, the lateral swollen areas of the genital segment are more pro- 

 nounced in G. ornatus (see pi. 1). The 5th legs of the female G. ornatus 

 extend to the end of the abdomen or slightly beyond, whereas the 5th 

 legs of G. americanus do not (compare figs. 2 and 25, and see pi. 1). 

 The only specimens of this species studied by the author were collected 



