KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND. 22. N:0 7. 231 



The first pair of antenna? (PI. XI, fig. 27 and 28) reach a little beyond the under 

 margin of the head. The first joint of the peduncle is large, almost three times as long 

 as the two following together. The single flagellar joint is twice as long as the whole 

 peduncle, slowly tapering towards the apex, and is provided with four pairs of long 

 olfactory hairs along the inner side; the outer margin is fringed with short hairs which 

 are curved at the apex. 



The second pair of antennce (PI. XI, fig. 29) are very short, consisting of only one 

 peduncular joint, and one representing the flagellum. 



The perceon. The coalesced first four segments show distinct sutures at the lower 

 parts of the side, and are provided with distinct epimerals as the last three segments. 

 The coalesced part is about as long as the three following segments together. The. seventh 

 segment is strongly convex, and abruptly much wider than the first pleonal segment. 



The first pair of perceopoda (PL XI, fig. 30 and 31). The femur is shorter than 

 the four following joints together; the front margin is convex, the hind margin almost 

 straight. The genu is broader than long, and without bristles. The tibia is longer than 

 the genu, and is broadly produced at the lower hind horner, which carries three stout 

 bristles. The carpus is only a little produced; the front margin is straight; the hind 

 margin is feebly convex, and twice notched, each notch carrying a bristle; the under side 

 is armed with three bristles on each margin, and a terminal one at the feebly protruding 

 hind corner. The metacarpus is longer than the carpus, the front margin is convex, 

 and without bristles; the hind margin is feebly concave, and finely serrated, with equal, 

 simple teeth; on the outer side of the joint there are two long bristles. The dactylus is 

 more than half as long as the metacarpus, curved, and armed with fine, spine-like teeth 

 along the hind margin (PI. XI, fig. 31). 



The second pair are a little longer than the first, and reach to the middle of the 

 carpus of the third pair. The femur is a little broader below than at the base; the 

 front margin is straight, the hind margin is feebly convex at the lower end; the femur 

 is fully as long as the four following joints together. The tibia is somewhat more pro- 

 duced than in the first pair, and armed at the lower hind corner with four or five bristles. 

 The front side of the carpal process is quite half as long as the hind margin of the 

 metacarpus; each margin is armed with four bristles. The metacarpus is longer than 

 the stem of the carpus; the front margin is convex, without bristles; the hind margin is 

 straight, and serrated as in the first pair; on the outer side of the joint there is a single 

 bristle. The dactylus is more than half as long as the metacarpus, with the hind margin 

 finely serrated. 



The third and fourth pans (PI. XI, fig. 32 and 33). The femur is almost linear, 

 and is three times as long as broad. The genu is longer than broad, and smooth. The 

 tibia is longer than the genu, with the front margin convex; the hind margin is 

 nearly straight, and armed with a single bristle near the apex. The carpus is some- 

 what longer, but narrower, than the tibia; the hind margin is straight, finely serrated, 

 and provided with two short bristles at the lower end. The metacarpus is tolerably 

 broad, and a little longer than the carpus; the hind margin is finely serrated; usually 

 all the joints of these pairs as well as those of the other pairs are occupied by well deve- 



