234 BULLETIN 54, LTNITED STATES NATIONAL MUSEUM. 



abruptly longer than those of the second pair. There is a high carina 

 on the basis of the four posterior pairs of legs. 

 The male is smaller than tlie female. 



CERATOTHOA IMPRESSA (Say). 



Cymothoa impressa Say, Jour. Acad. Nat. Sci. Phila., 1, 1818, p. 397. 



Cet^atotlioa linearis Dav! A, U. S. Expl. Exp. Crust., XIV, 1853, p. 752, pi. l, titrs. 

 la-Id. 



Ceratothoa exocidi Cunningham, Trans. Linn. Soc. London, XXVII, 1869-71, {). 

 499, pi. Lix, fig. 5. 



Glossobius linearis Schicedte and Meixert, Naturhistorisk Tidsskritt (3), XIII, 

 1881-83, pp. 301-308, pi. xii, figs. 1-2. 



Ceratothoa linearis Stebbing, Hist, of Crust., 1893, p. 354. — Richaedson, Amer- 

 ican Naturalist, XXXIV, 1900, p. 221; Proc. U. S. Nat. Mus., XXIII, 1901, 

 p. 529. 



Localities. — From latitude 42° to 21° north; latitude 8° to 10° north, 



longitude 40° to 50° west; latitude 34° north, longitude 51° west; Rio 



^ de elaneiro, Brazil; in the 



Gulf Stream everywhere; 

 Cape Mav, New Jersey 

 (Say). 



Having had an oppor- 

 tunity to examine Sa5^'s 

 tvpe specimen of Cymo- 

 thoa l/npressa, deposited 

 in the Philadelphia Acad- 

 emy of Natural Sciences, 

 its identity with Cerato- 

 thoa lluearh Dana is 

 found to be unquestion- 

 able. The earlier name 

 will therefore have to be adopted for this specie-. 



Parasite of flying-tish, Exoca'tus sp. ; e. </., Exocdetus exiUens^ Ex. 

 laiaeUiferus^ Ex. hracliyceplialus (Schiosdte and Meinert); on Cory- 

 plixna sp. 



Body elongate, a little more than three times longer than wide, 10 

 mm. : 33 mm. 



Head a little wider than long, 3 mm. :4 mm., not deeply set in the 

 thorax, with the front excavate on either side of a broad and elongate 

 median process, 1 mm. in length and 1 mm. in width, the apex of which 

 is obtusely pointed. The antenn;e lit in these excavations. The antero- 

 lateral angles of the head are acutely pointed. The eyes are small, 

 about twice as wide as long, and somewhat obliquely placed at the 

 sides of the head, about halfway between the antero-lateral and post- 

 lateral angles. The tirst pair of antenna^ are composed of seven arti- 

 cles, the basal articles in each antenna Ijcing adjacent on the ventral 

 side. The first antenna? extend just below the ey^es. The second pair 



Fig. 236.— CERATOTHttA IMPRESSA (Aftee Schicedte and 

 Meinert). a, Adult female. 6, Lateral view ok tho- 

 rax, c. Lateral view of thorax of male, d, Adii.t 

 male. (Enlarged.) 



