REPORT ON THE PELAGIC ilEMIPTERA. 61 



The Abddmen of the Female. 



The alxlomen of the female (PL II. fig. 4 $ ah. «., 4 $ ah. h., 5 ? ah. h.) is ou the 

 •whole similar to that of the male. 



llie (jfeuital Segments of the Male. 



Tlie first seyment aibove is similar to the sixth alxlomiual segment, Ijut narrower ami 

 longer ; like it it is provided with an erect connexivum. Below it is ring-like, but nearly 

 as long as all the ventral abdominal segments together ; the hind margin is concave. 



Tlie second is, below, longer than the first, the hind margin concave, the sides prolonged 

 and sloping upwards and backwards to the upper surface, where they form a convex 

 oblong plate (with hairy margins) nearly concealing the third above. 



Tlie thiixl below is a convex roundish plate ; above is a small conical tubercle like 

 the podical plates in Halohates, nearly concealed, and embraced by the third segment 

 below. There is therefore reason to l)elieve that tlni third segment above and the third 

 below are not to l>e considered as the same segment. I have had no opportunity of 

 making dissections. 



T]i,e Crcidtal Segments of the Female. 



Three segments are visible above, but only one below. The first and second above 

 rcsemlile the sixth abdominal above, but are somewhat shoiter and narrower. The third 

 above is a conical tubercle. 



The only segment visible below is triangularly convex, with the apex truncate, tlie 

 sides sloping upwards and embracing the sides of the three segments aljove, forming, as 

 it were, a continuation of the erect connexivum of the abdominal segments. 



The Legs. 

 The Front ly.ys. 



As in Halohates, these are very short in comparison with tlie others, and fur the 

 greater part of their length lie well in advance of the bod}-. 



Tlie Acetahulum (PI. II. fig. 5, av.) is very large, occupying tlu' outer tliird on rach 

 side of the prosternum, and extending from the front to the hind margin. Its opening is 

 circular, and looks backwards and downwards ; on tlie middle line in fnmt is a suture or 

 slit reaching from the rim to the base, but not triangularly emarginate as in llalohates. 



The Coxa is nearly altogether immersed in the acetabulum, ajipeariiig merely as a ring 

 above the opening. 



