THE GENUS LEBEliTIA. 501 



broader in porosa than in ins ignis. The inner corners of the 

 third and fourth pairs of epimera are more rounded, not so 

 acute as in insignis. All the sutures and margins are thick, 

 the inner ones particularly so. 



Some variation appears to manifest itself with regard to the 

 length of the legs, but in general it may be said that the two 

 anterior pairs of legs are short, and that the two posterior pairs 

 attain something like the length of the body or a little over. 

 The sixth segments are either weakly thickened or not at all. 

 The sixth segment of the first pair of legs is not thickened, 

 but reduced in length. The thickening of the corresponding 

 segment of the second pair of legs is scarcely appreciable, more 

 so, however, in that of the third and fourth pairs of legs. The 

 first three segments of each pair of legs are the shortest, the 

 other three the longest. In comparing the first segment of each 

 pair of legs, it will be noticed that that of the fourth pair of legs 

 is by far the longest. Swimming hairs are entirely wanting in 

 the first pair of legs. The second pair has a small group 

 clustered at the distal end of the fifth segment ; these are not so 

 long as the succeeding segment. The third pair has five to ten 

 long swimming hairs at the distal end of the fourth segment, and 

 eight to fifteen at the end of the fifth segment. The fourth pair 

 of legs has five to nine long hairs at the distal end of the fourth 

 segment, and anything from eight to seventeen at the end of the 

 fifth segment. The claws appear to be of normal form, a large 

 thin claw with a thin broad laminate base, and in the narrow 

 interval between a small accessory claw. 



The genital area is fairly typical in form, and extends but 

 little beyond the epimera. The male is distinguishable from the 

 female by the greater breadth posteriorly in the valves and by 

 the number of gland hairs along the inner margins, viz. twenty 

 to thirty-three where the female has only from fourteen to 

 twenty. The large pores along the outer margin are few in 

 number, not more than five pairs at the most. Of the sclerites 

 which serve for muscle attachment, the anterior one is triangular 

 in shape, with its apex continued into a narrow bridge to bind 

 it to the epimera. The posterior one is broad and porose, and 

 is more like a semicircle in outline. The two anterior pairs of 

 acetabula are long and narrow, rather rectangular, with rounded 

 corners. The posterior pair is much shorter and broader. 



