KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 419 



The uropoda (PL XVII, tig. 20). The first pair do not reach fully to the apex 

 of the third pair; they are broadly ovate, broader below than above, and fringed with 

 minute hairs. The second pair do not attain the apex of the first pair, and are consi- 

 derably narrower; they are fringed with minute hairs as in the first pair. The third 

 pair are rather broader than the first pair, and are more than twice as long as the last 

 coalesced ural segment; the margins are fringed with minute hairs. 



The telson is broadly triangular, with the margins somewhat convex and the apex 

 rounded; it is broader than long, and about half as long as the last pair of uropoda. 



The female. 



PI. XVII, fig. 3, 5, 19, and 21. 



The body is thicker and shorter than in the male. The head and peraeon together 

 are longer than the pleon and urus together. 



The head is comparatively deeper than in the male. 



The first pair of antennae (PL XVII, fig. 5) consist of a two-jointed peduncle and 

 a minute flagellar joint. The first joint of the peduncle is thick and swollen, the second 

 is very short, and a little broader than long. The single flagellar joint is rather shorter 

 and narrower than the last peduncular joint, and is covered with long stout olfactory hairs. 



The second pair of antenna 3 are represented by a slightly protruding tubercle below 

 the insertion of the first pair. 



The month-organs are like those in the male, but the mandibles want a palp. 



The perceon. The first and second coalesced segments are longer than the third; 

 the fifth segment is the longest of all. 



The ovitectrices are thin, irregularly ovate, and a little shorter than the corresponding 

 branchial vesicles. 



The perwopoda are exactly like those in the male. 



The pleon is considerably shorter than the perason. 



The urus and its appendages are like those organs in the male. 



