384 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



mouth parts. First legs with 1-segmented exopod and 2- or 3-seg- 

 mented endopod ; rami of three following pairs of legs 3-segmented ; 

 fifth legs uniramose, 2-segmented. A single species. 



ARTACOLAX SAETIGER Wilson 



FiGUEE 236 

 Artacolax saetiger Wilson, Proe. U. S. Nat. Mus., vol. 39, p. 361, pi. 51, 1911. 

 Occurrence. — Found on the gills of the flying fish {Exocoetus voli- 

 tans) taken at Woods Hole. 

 Disrihution. — Not found outside the present area. 



Color. — Body a rich seal brown, 

 uniform over the entire dorsal sur- 

 face, paler and somewhat yellowish 

 on the ventral surface ; eye invisible ; 

 eggs white. 



. Female. — Cephalic segment semi- 

 elliptical, posterior margin straight, 

 anterior margin unevenly rounded, 

 length to width as 7 : 10 ; third and 

 fourth segments also semielliptical, 

 much narrower than the cephalic 

 segment, length to width as 2:3. 

 Sides of genital segment straight; 

 abdomen considerably narrowed 

 posteriorly ; caudal rami quadrangu- 

 lar, as wide as long. Each first 

 antenna armed at its base with a 

 chitin plate split into three finger- 

 like processes; apical claw of 

 maxillipeds armed with two huge plumose setae ; terminal segment of 

 fifth leg twice as long as basal segment and armed with four apical 

 setae. Total length, 2 mm. 

 Male. — Unknown. 



Remarks. — This species can be recognized by the tripartite chitin 

 plate projecting from the frontal margin of the base of each first 

 antenna. Only a few flying fishes have been examined for this 

 parasite, and it may be more common than would be inferred from 

 the above account. 



Family TAENIACANTHIDAE 



Genus ANCHISTROTOS Brian, 1906 



Body cyclopoid; head fused with the first segment, much larger 

 than any of the free segments, with a small rostral projection at 

 the center of the frontal margin. Urosome one-third the length of 



Figure 236. — Artacolax saetiger: 

 Female, dorsal ; h, female, fifth leg 



a. 



