KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 103 



finely serrated along the inner one; there are grooves at the bases of the rami as in 

 the first pair. The third pair are broader and stouter than the two preceding pairs; the 

 peduncle is only a little more than twice as long as broad; the inner ramus is .scarcely 

 longer than the breadth of the peduncle, serrated along both margins; the outer ramus 

 is rather longer than the inner, and narrower; it is smooth on the outer margin, and 

 serrated along the inner. 



The telson is broadly rounded, equalling a third of the length of the peduncle of 

 the last pair of uropoda, but it is not as long as the breadth of the same peduncle. 



The female. 



The body is broader and wider than in the male, and the colour is lighter. 



The head is as long as the first two personal segments together, much more broad 

 than long. The antennal groove commences below the middle of the front side of the head. 

 The head is fully twice as deep as long. 



The eyes as in the male. 



The first pair of antennae (PI. VII, fig. 18). The first joint of the peduncle is stout, 

 cylindrical, fully twice as long as the two following joints together, the second joint is 

 thicker and a little longer than the third. The first joint of the flagellum is elongated, 

 tapering, nearly twice as long as the whole peduncle, the inner side is set with equi- 

 distant tufts of slender hairs; a second, very small, flagellar joint is always present, tipped 

 with one or two minute hairs. 



The second pair of antennae (PI. VII, fig. 19) consist of four joints, the first three 

 may be regarded as the third, fourth and fifth joints of the peduncle; the third or first 

 free joint is very short, globular, the two following joints are equal in length. The only 

 flagellar joint is elongated, tapering, longer than the whole peduncle, the inner side spar- 

 ingly provided with minute hairs. 



The mouth-organs are like those in the male. 



The peraeon is abruptly widening from the second segment, and again gently narrow- 

 ing from the fourth segment; the third segment is the widest, the third and fourth are 

 the longest, equal in length. 



The epimerals are as long as the under margins of the corresponding segments; the 

 epimeral of the fourth pair is the longest, a little longer than that of the third pair. 



The branchial sacks are like those in the male. 



The ovitectrices are a little longer than the femora of the corresponding legs, the 

 margins are smooth. 



The first pair of perceoipoda (PI. VII, fig. 20 and 21) are more robust and powerful 

 than that pair in the male. The femur is very broad, not twice as long as broad, the 

 front margin is strongly convex. The genu is as long as broad, smooth. The process 

 of the tibia is rather longer than in the male but does not reach fully to the base of 

 the carpal process; the lower margin of the tibial process is fringed with stout bristles. 



