248 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



</. Antero-lateral angles of the first thoracic segment obtusely rounded, not reach- 

 ing the middle of the head ( 'ymothoa exiyua Schi<L>dte and Meinert 



V. Antero-lateral angles of the first thoracic segment wide. 



Cymothoa caraibica Bovallius 



a / . Antero-lateral angles of the first thoracic segment very large and wide, half as 

 wide as the head, rounded and extending to the anterior margin of the head. 

 No traces of eyes present. First thoracic segment twice as long as second seg- 

 ment. Uropoda as long as the terminal abdominal segment. Outer branch 

 slightly shorter than inner branch Cymothoa oestrum (Linnaeus) 



CYMOTHOA EXCISA Perty. 



Ctfmothoa excisa PERTY, Del. Amin., 1830-34, p. 211. 



Cymothoa parasita SAUSSURE, Revue Mag. Zool. (2), IX, 1857, p. 306; Mem. Soc. 



Phys. Geneve, XIV, Pt. 2, 1858, p. 485, pi. v, fig. 44. 

 Cymothoa excisa SCHKEDTE and MEINERT, Naturhistorisk Tidsskrift (3), XIV, 



1883-84, pp. 238-244, pi. vi, figs. 11-16. (See Schiccdte and Meinert for 



above synonymy.) RICHARDSON, American Naturalist, XXXIV, 1900, p. 



221; Proc. IT* S. Nat. Mus,, XXIII, 1901, p. 530. 



Localities. Massachusetts; Florida Reefs; Charleston Harbor, 

 South Carolina; Bahamas; Biloxi, Mississippi; Cuba; Maranhao; Rio 



FIG. 259. CYMOTHOA EXCISA (AFTER SCHICEDTE AND MEINERT). a, UNGULA OF THE LEG OF THIRD 



PAIR OF YOUNG OF SECOND STAGE (KNGARGED). b, LATERAL VIEW OF THORAX OF ADULT FEMALE 



(REDUCED), c, ADULT FEMALE (REDUCED), d, YOUNG OF SECOND STAGE (ENLARGED), e, ADULT 



MALE (ENLARGED). /, LATERAL VIEW OF THORAX OF ADULT MALE (ENLARGED). 



Janeiro; South Florida; Key West, Florida; Porlaraar, Margarita 

 Island, Venezuela. 



Parasite of chub (from lip); in the gills of a sparid (" Spanis" sp. 

 Schiosdte and Meinert). 



Body oblong-ovate, nearly twice as long as wide, 12 mm. : 23 mm. 



Head a little wider than long, 3 mm. :4 mm., and deeply set in the 

 first thoracic segment, the narrow, acute antero-lateral angles of which 

 extend half the length of the head. The antero-lateral angles of the 

 head are rounded and curve slightly upward, the anterior portion of 



