246 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



FIG. 255. INDUSA CARINATA. 

 HEAD AND FIRST THORAC- 

 IC SEGMENT. X 5. 



4O. Genus INDUSA" Schicedte and Meinert. 



Body convex, anteriorly narrowed, or compressed from side to side. 

 Head but little immersed. First pair of antennae almost contiguous 

 at the base, slender, not dilated. 



Anterior margin of the first thoracic segment widely sinuated, the 

 antero-lateral angles but little produced, rounded. 



Abdomen but little immersed. 



INDUSA CARINATA'' Richardson. 

 Indusa carinata RICHARDSON, Proc. U. S. Nat. Mus., XXVII, 1904, p. 52. 



Locality. West coast of Panama. 

 Parasite of Mugil hospes. 



Body very convex, being highly and roundly elevated. Thorax 

 large, rounded, almost as wide as long, the last two segments rapidly 



converging to the narrow 



abdomen. Abdomen nearly 



three times narrower than 



greatest width of thorax, 



with all the segments of 



equal width. 



Head about two and a half 



times narrower than first 



thoraic segment and four times narrower than 

 fourth segment; front triangular in shape and pro- 

 duced into an acute point projecting between the 

 basal joints of the antennae. 3^68 distinct and 

 situated at the sides and about the middle of the head. First pair of 

 antennae, which are almost contiguous, being separated only by the 

 very acute median point, reach to the eyes; flagellum seven jointed. 

 Second pair of antennas extend to the posterior margin of the head; 

 flagellum nine jointed. 



First thoracic segment rounded anteriorly and posteriorly, the sides 

 of the segment surrounding the head, the lateral angles extending to 

 the e} 7 es. The first four segments gradually increase in width. The 

 fourth and fifth are about equally wide. The sixth and seventh 

 rapidly decrease in width, converging to the narrow abdomen. The 

 epimera are well developed on all the segments with the exception of 

 the first; the} T are narrow and elongate, rounded posteriorly and not 

 reaching the posterior margin of their respective segments. 



The abdomen is likewise very convex and is nearly three times 

 narrower than the thorax at its greatest width. The segments are of 



Schicedte and Meinert, Naturhistorisk Tidsskrift (3), XIV, pp. 334-335. 

 &This species is included because the fish on which it is parasitic is found on the 

 coast of Mexico. 



FIG. 256. INDUSA CARIN- 

 ATA. x 2|. 



