KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND. 22. N:0 7. 



291 



The female. 



PI. XIII, fig. 1—5, and 22. 



/£>% 



Euthemisto libellula, Mandt. Adult female. 

 Copy from C. Bovallius, Arct. and Antarct. Hyper., pi. 46, fig. 90, 93, 94 and 96. 



Fig. 1. The female from the side. 2. The second pair of peraeopoda. 3. The third pair. 4. The urus. 



The body is somewhat broader than in the male, the perseon being a little broader 

 than the head, and nearly twice as broad as the pleon. The head and perseon together 

 are considerably longer than the pleon and urus together. The body is distinctly 

 carinated dorsally. 



The head is quite as long as deep, and somewhat broader than long; it is not fully 

 as long as the first three pergonal segments together. The young female has the head 

 comparatively larger, and considerably deeper, than the peraeon, but still it is shorter than 

 the first three pereeonal segments together. 



The first pair of antennce (PI. XIII, fig. 1 — 4) in the adult female are quite as 

 long as the head, and consist of a three-jointed peduncle and a single flagellar joint. 

 The first joint of the peduncle is longer than the two following together. The single 

 flagellar joint is nearly four times as long as the whole peduncle; it is evenly curved, and 

 coarsely serrated along the under margin; the inner side is densely set with long hairs 

 (PI. XIII, fig. 1). In the young female the first pair of antennae are much shorter than 

 the head, and the single flagellar joint is short, irregularly conical, and scarcely longer 

 than the peduncle (PI. XIII, fig. 4). 



