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PROCEEDINGS OF THE NATIONAL MUSEUM 



D. litus it forms a shelflike projection, the base of which extends 

 proximally along the posterior lateral sm"face of the first segment. 

 In D. curtus, this projection is bifurcate distally. 



The basic design of the female antenna is similar in all fom* species. 

 The size of the first and second segments varies to some degree and 

 the complexity of the first segment differs. These are, however, 

 not thought to be of a value sufficient to show interspecific similarities 

 and differences. 



The antenna of the male does however show some rather distinct 

 interspecific differences, especially in the makeup of the third segment 

 and the terminal process. The terminal processes of D. curtus and 

 D. litus are so bizarre that a comparison is almost impossible. The 

 The male antenna of D. ulua is quite similar to that of Lepeophtheirus 

 crassus (Wilson et Bere) Shiino, 1960, in the position and extent of 

 the adhesion surfaces and the shape and makeup of the third segment 

 and terminal process, although that of D. ulua is somewhat more 

 complex. The similarity of the male antenna of D. hifurcatus to 

 the other species is questionable, although it is more like that of D. 

 ulua in regard to the adhesion surfaces, third segment, and terminal 

 process than either D. curtus or D. litus. 



The postantennal process is fairly similar in all four species and 

 the differences do not appear sufficient to warrant any specific com- 

 ments. 



Table 9. — Female fifth leg measurements (in mm.) and relative lengths 



• TL: total length. 

 a L-5: fifth leg. 



3 TP-5: terminal process of fifth leg. 



Table 10. — Male fifth and sixth leg measurements {in mm.) and relative lengths 



1 TL: total length. 



* L-5: fifth leg (L-6: sixth leg). 



3 TP-5: terminal process of fifth leg (TP-6: terminal process of sixth leg). 



