KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 185 



broader than that of the third and fourth pairs, and by the telson being shorter than half 

 the peduncle of the last pair of uropoda. 



The male. 



PI. X, fig-. 25—29. 



The body is broad but not tumid, the hind part not being more compressed than 

 the peraeon; the pleon and urus together are considerably longer than the person. 



The head is deeper than long, and a little deeper than broad. The antennal groove 

 on the front side commences above the middle and is somewhat higher than broad. 



The first pair of antenna? in the adult male are much more than half as long as 

 the whole length of the animal, longer than the head and pera?on together, and shorter 

 than the second pair. The first joint of the peduncle is about as long as broad, and not 

 fully twice as long as the two following joints together. The first joint of the flagellum 

 is about as long as the whole peduncle, not very tumid and slowly tapering towards the 

 apex; the under and inner sides are thickly covered with olfactory hairs; the second and 

 third joints are very short; the following joints increase in length to the eighth, the 

 next are equal in length, the last is somewhat shorter; in all the flagellar joints are 

 twenty-four in number. 



The second pair of antenna?. The peduncle is stout; the first free joint is as long 

 as broad; the glandular cone is very large and obtusely rounded at the apex. The second 

 peduncular joint is a little more than half as long as the first; the third is almost cylin- 

 drical, and scarcely as long as the two preceding together. The first joint of the flagellum 

 is longer than the last peduncular joint, broad at the base and evenly tapering towards 

 the apex; the following joints are subequal in length. The flagellum has in all twenty- 

 five joints. 



The mouth-organs are like those in Hyperia Latreillei. 



The perceon. The first segment is fully as long as the second; the third is a little 

 longer; the seventh is the longest of all and considerably longer than the sixth. 



The epimerals are about as long as the under margins of the corresponding seg- 

 ments, and irregularly rounded below. Those of the first four pairs are fully as deep as 

 long; the following are longer than deep. 



The branchial sacks are large, ovate, and almost as long as the femora of the 

 corresponding pairs. 



The first pair of perosopoda (PI. X, fig. 26 and 27). The femur is as long as the 

 four following joints together. The genu is broader than long, with a few comparatively 

 short bristles at the lower hind corner. The tibia is broadly produced at the lower hind 

 corner, gouge-shaped, truncated at the apex, and fringed with tolerably short bristles. 

 The carpus is longer than the two preceding joints together, dilated, and much longer 

 than broad at the lower end; it is distinctly produced, and the margins of the front side 



K. Sv. Vet. Akad. Handl. Rand. 22. N:o 7. ^4 



