KONGL. SV. VET. AKADEMIENS HANDLINGAE. BAND. 22. N:0 7. 297 



own, and as his description is detailed I can restrict myself to give only a few comple- 

 mentary notices. 



The head and peraeon together are a little longer than the pleon and urus together. 



The head is deeper than long, and about as broad as long. 



The first pair of perceopoda have a strong bristle at the middle of the hind margin 

 of the metacarpus. 



The second pair are much longer than the first. The tibial process is about half 

 as long as the stem of the carpus. The carpal process is more than half as long as the 

 hind margin of the metacarpus, and wants a terminal spine. 



The third and fourth pairs have the femur considerably narrower than in Euthemisto 

 libellula, being about two and a half times as long as broad. The tibia is scarcely longer 

 than the genu, and is only a little produced at the lower front corner. The carpus in 

 the adult animal is irregularly triangular; the front margin is smooth; the hind margin 

 is set with long bristles, and is pectinated. The metacarpus is about as long as the 

 carpus. 



The fifth pair have the femur moderately broad, being only a little more than 

 twice as long as broad; 1he front margin is strongly convex, and set with bristles. The 

 tibia is twice as long as the genu, and has the lower hind corner only a little produced, 

 the process being scarcely a third part as long as the rest of the joint. The carpus is 

 nearly twice as long as the femur, and is about five times as long as broad; the front 

 margin is set with equidistant, spine-like bristles, and irregularly pectinated between them; 

 the hind margin has a few spine-like bristles on its lower half. The metacarpus in 

 the adult animal is very long and slender, only a little shorter than all the preceding 

 joints together; the long, spine-like teeth forming the pectination on its lower half are 

 almost rectangular to the joint, in the young animal they are directed a little down- 

 wards. The dactylus is smooth, and is about a twelfth part as long as the metacarpus. 



The sixth and seventh pairs. The femur is moderately dilated, being about two 

 and a half times as long as broad; it is considerably shorter than that in the fifth pair. 

 The tibia is nearly three times as long as the genu. The carpus is about twice as long 

 as the tibia, and only a little shorter than the femur; the front margin is finely pectinated, 

 and set with equidistant, long bristles; the hind margin is armed with long bristles. The 

 metacarpus is much longer than the carpus, and is a little longer in the seventh pair 

 than in the sixth; the front margin is finely pectinated, and carries a row of long bristles 

 on the side. The dactylus is nearly a fourth part as long as the metacarpus in the 

 adult animal. 



The pleon is longer than the last six perseonal segments in the male, in the female 

 it is considerably shorter. The hind corner of the pleonal segments is sharp-pointed but 

 not produced. 



The urus is nearly as long as the last pleonal segment. 



The uropoda. The first pair reach considerably beyond the apex of the second 

 pair, but do not reach fully to the middle of the outer ramus of the third; the peduncle 



K. Sv. Vet. Akad. Handl. Rand. 22. N:o 7. <->*-> 



