234 BULLETIN 54, UNITED 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 the female. 



CERATOTHOA IMPRESSA (Say). 



Cymothoa impressa SAY, Jour. Acad. Nat. Sci. Phila., I, 1818, p. 397. 



Ceratolhoa linearis DANA, U. S. Expl. Exp. Crust., XIV, 1853, p. 752, pi. L, fijjp. 



la-Id. 

 Ceratothoa exocasti CUNNINGHAM, Trans. Linn. Soc. London, XXVII, 1869-71, p. 



499, pi. LIX, fig. 5. 

 Glossobius linearis SCHICEDTE and MEINERT, Naturhistorisk Tidsskrift (3), XIII, 



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

 Ceratothoa linearis STEBBING, Hist, of Crust., 1893, p. 354. RICHARDSON, Aim-r- 



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 

 a j de Janeiro, Brazil; in the 



Gulf Stream everywhere; 

 Cape May, New Jersey 

 (Say). 



Having had an oppor- 

 tunity to examine Say's 

 type specimen of Cymo- 

 thoa impressa, deposited 

 in the Philadelphia Acad- 

 emy of Natural Sciences, 

 its identity with Cerato- 

 thoa linearis Dana is 

 found to be unquestion- 

 able. The earlier name 

 will therefore have to be adopted for this specie.-. 



Parasite of flying-tish, Exocatua sp. ; e. g., keoccetu exiliens, Ex, 

 lamelliferus, Ex. brachyeephalus (Schioedte and Meinert); on Cory- 

 phsena 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 antenna 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 first pair of antennae are composed of seven arti- 

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

 side. The first antennae extend just below the eyes. The second pair 



FIG. 236. CERATOTHOA IMPRESSA (AFTER SCHICEDTK AXI> 

 MEINERT). a, ADULT FEMALE. 1>, LATERAL VIEW OF THO- 

 RAX, c, LATERAL VIEW OF THORAX OF MALE, d, ADVLT 



MALE. (ENLARGED.) 



