200 Bulletin, Vanderlilt Marine Museum, Vol. Ill 



Genus: NEROCILA Leach. 

 Nerocila bartscM Boone. 



Plate 76. 



Type : Collected in Bahia Honda, Cuba, June 7, 1914, and deposited 

 in the United States National Museum, 



Remakks: The specimen before me enables me to correct an error 

 made in 1918, in following the advices of my colleagues in the United 

 States National Museum and creating a new family for this curious 

 parasite, first reported from East American waters by a single mal- 

 formed specimen taken at Bahia Honda, Cuba. 



Material examined : The specimen taken by the ''Ara," at Taboga 

 Island, Perlas Islands, Pacific Ocean, February 19, 1928, establishes 

 the first record for the species from the American Pacific. It is to be 

 regretted that the host of the American specimens is unknown in both 

 cases. 



Distribution : Known from the coasts of Cuba ; also from the Perlas 

 Islands. 



Technical description: Body strongly depressed, oval, 20 mm. 

 long, 11 mm. wide, or 13 mm. wide, including the wing expansion; 

 thoracic margins produced acutely into roughly triangular, wing-like 

 formations. A broad, median dorsal black band extends the length 

 of the body; followed on either side by a narrower, creamy band, 

 then a broader black band which widens posteriorly extending to the 

 extreme lateral margin from the fifth thoracic segment backward; 

 the lateral margins of the head and first three thoracic segments are 

 tipped with cream color. 



Head wider than long, 3.5 mm. 2.5 mm., anterolateral margin oval; 

 median posterior margin oval, less curved postlaterally. Eyes very 

 feeble, located in postlateral angles of the head. The antennae are 

 short and are attached so far on the ventral surface of the head that 

 they are scarcely visible dorsally. The first pair consists of eight short, 

 stout, subequal articles and extend almost to the middle of the first 

 thoracic segment. The antennae are similar but slightly longer, con- 

 sisting of ten articles. Mandibles small, with a palp of three articles. 

 First maxillae with outer lobe slender, tipped with small spines ; inner 

 lobe feeble. Maxilliped with a palp of three articles. 



Thorax: First segment 2.5 mm. long, anterior margin excavated, 

 anterolateral angles bluntly produced beyond the angles of the head, 



