On a Species of Aearus. By A. D. Michael. 215 



right, and more than proportionately stouter ; it reaches much in 

 front of all the other legs, although usually carried obliquely, so as 

 to cross in front of the rostrum. It is about the same general 

 shape as the leg on the other side, but the femur is longer in pro- 

 portion, and the tarsus is quite different, having a strongly concave, 

 instead of a convex outer edge, and being thinner and more 

 chitinous, but increasing suddenly at the distal end, instead of 

 coming to a point. 



The two hinder pairs of legs are distant from the front pairs, 

 so short as not to reach beyond the body, and about equal-sized. 

 They are only visible from their great thickness, as they are set 

 under the body. Each of -the first three joints of these legs is 

 greatly wider than its length. The tarsi are curved inward. 



The epimera are different on the two sides, that of the enlarged 

 leg having a special provision to support it. From the chitinous 

 block on each side of the rostrum a very short branch extends to a 

 sternal ridge. The epimeron of the right side is not anchylosed to 

 this ridge ; that on the left is. The epimeron on the left side is 

 the strongest, and is anchylosed to that of the first pair, whereas 

 that of the right side is free. The epimera of the second, third, 

 and fourth pairs are joined on both sides. The epimera from the 

 two sides nearly meet at the median line of the body, but are not 

 joined. 



The penis is short and broad, and is supported by a horseshoe- 

 shaped sternite, with a central point projecting forward. There is 

 one pair of anal suckers. 



Hairs. — An extremely long, flexible hair, almost as long as the 

 body, is attached to each of the caudal projections about a third of 

 the distance from the tip ; and another, rather shorter and finer, 

 still nearer to the distal end. There is a strong hair near the pos- 

 terior angle of the wide part of the body, a pair on the dorsum of 

 the cephalothorax, numerous hairs on the tarsi, and a few scattered 

 ones on other parts of the legs and body, particularly the under 

 side. 



The Female (reproductive). Figs. 2 and 3. 



The anterior part of the body is much like that of the male, but 

 the chitinous collar is even heavier. The abdomen is not so long 

 as in the male, and not so much diminished posteriorly. The 

 chitinous notogastral plate does not reach the hind margin, and 

 there are not any caudal projections, the hind margin being trans- 

 parent, but strengthened at each side by a band of chitine, which 

 runs along the edge of the body on the ventral surface. 



At the angle of the posterior and lateral margins is a curved 

 spike ; then, proceeding forwards along the lateral margin, come 

 two very long hairs, nearly corresponding to those on the caudal 



