2 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



Gloiopotes Steenstrup and Lutken, 1861 



Gloiopotes Steenstrup and Lutken, 1861, p. 363. [Type-species =G. hygomianus.] 

 Lepeophtheirus, Thomson, 1889, p, 354 [refers to L. huttoni only]. 

 Caligus, Marukawa, 1925, p. 1243 [refers to C. longicaudatus only]. 



Euryplaoridae. First 3 tlioracic segments fused witli head. Fourtli 

 thoracic segment with winglil^e dorsal plate. Genital segment with 

 posterior outer corners produced in female. Fifth legs conspicuous in 

 both sexes. Abdomen 2-segmented. Caudal rami filiform. First 

 antenna 2-segmented. Second antenna with strong claw. Second 

 antenna claw of male with median accessory process. Postantennal 

 and postoral processes present. Sternal fm'ca present. Legs 1-3 

 biramose (Yamaguti, 1963, p. 103, erroneously cites leg 1 as unira- 

 mose). Leg 4 uniramose. Egg strings uniseriate. 



Key to Females of Gloiopotes 



1. Dorsal body surface without conspicuous ornamentation, posterior process of 



sternal furca with single point, distal posterior lobe of genital segment 



extending beyond end of 5tli leg hygomianus 



Dorsal body surface with conspicuous ornamentation, posterior process of 

 sternal furca bifid, distal lobe of genital segment not extending beyond 

 end of 5th leg 2 



2. Lateral margins of dorsal thoracic plate nearly parallel to anterior-posterior 



body axis, lateral margins of genital segment with conspicuous bulge 



bearing stout spines 3 



Lateral margins of dorsal thoracic plate at nearly 45° angle to anterior- 

 posterior body axis, lateral margins of genital segment uniformly rounded, 

 bearing small spines 4 



3. Middle of 2nd abdominal segment with bulbous swelling, 5th leg extending 



to end of abdomen ornatus 



Middle of 2nd abdominal segment swollen but not bulbous, 5th leg not ex- 

 tending to end of abdomen americanus, new species 



4. Genital segment longer than wide, tip of 5th leg not extending to end of 



abdomen huttoni 



Genital segment wider than long, tip of 5th leg extending to end of abdo- 

 men watsoni 



Gloiopotes americanus, new species 



Figures 1-24 



Specimens studied. — Eight collections from Istiophorus americanus 

 in the southMestern portion of the Gulf of Mexico made by various 

 cruises of the Oregon at stations 1051, 1069, 1071, 1075, and 1145. 

 Holotype 9, USNM 120189, allotype &, USNM 120190, and 12 

 paratypes (499, 8 d'cf) USNM 120191, from the collection made 

 at station 1145 (28°17' N, 87°52' W). Also the following collections 

 in the USNM labelled Gloiopotes ornatus: USNM 78600 from sail- 



