146 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



pines, Australia (Brady) ; Atlantic and Antarctic Oceans (Wolf- 

 enden). 



Color. — Body a light transparent blue, with a large area of dark 

 blue in the posterior portion of the thorax. Eyes large, separated 

 from each other, and dark red, appearing black by transmitted 

 light. 



Female. — Forehead with a crest; posterior corners of fifth seg- 

 ment with broad acuminate lobes extending diagonally outward and 

 backward beyond the posterior margin of the genital segment; uro- 

 some one-fourth as long as metasome, very asymmetrical; genital 

 segment swollen unevenly on the two sides; first abdominal seg- 

 ment with a dorsal spine at the right distal corner ; second abdominal 

 segment distorted to the right ; caudal rami grossly curved and mis- 

 shapen, the left one the larger, but with shorter setae ; right fifth leg 

 larger than left, endopods stout conical spines, exopods three times 

 as long as endopods, each ending in three stout, divergent spines. 

 Total length, 3.5-3.85 mm. 



Male. — Body longer and more slender than that of the female; 

 corners of fifth segment similar ; urosome and caudal rami symmet- 

 rical, penultimate abdominal segment longer than any of the others ; 

 left fifth leg with a 1-segmented endopod half as long as the 2-seg- 

 mented exopod and tipped with a curved filament ; chela of right leg 

 much swollen at the knuckle, the finger with a wide and angular flap 

 on its inner surface. Total length, 3.75-4 mm. 



Remarks. — All the localities here recorded, except the one in Vine- 

 yard Sound, are in or close to the Gulf Stream. They are the first 

 record of the species from American shores, and are the farthest 

 north of any records, although Wolfenden has reported specimens 

 from the Antarctic Ocean. The extraordinary asymmetry of the 

 female urosome and the details of the fifth legs in both sexes are 

 distinguishing characters. 



LABIDOCEKA NERII (Kr0yer) 



Figure 99 



Pontia nerii Kr0yke, Naturh. Tidsskrift, ser. 2, vol. 2, p. 579, 1849. 

 Labidocera nerii Giesbrecht, Fauna und Flora des Golfes von Neapel, vol. 

 19, p. 446, pis. 23, 25, 1892. 



Occwn^ence. — Two females from trawl wings, Station 2092, Alba- 

 tross^ south of Marthas Vineyard. 



Distribution. — Cape Finisterre (Kr0yer) ; tropical Atlantic (Lub- 

 bock, Giesbrecht) ; Malay Archipelago (Cleve) ; Atlantic (Wolf- 

 enden). 



Color. — No statement with reference to color has ever been made. 



Female. — Posterior corners of fifth segment angular but not pro- 

 duced ; urosome 2-segmented and one-fifth as long as metasome, and 



