REPORT ON THE PELAGIC HEMIPTERA. 47 



Middle legs: femur ,sul)ef[ual iu length to til)ia and tarsus together, armed -n-ith a 

 series of small teeth, as is the tibia ; tibia about three-fourths of the femur in lenoth • 

 tarsus (PL I. fig. 5, m.t) al^out three-fourths of the tiljia in length, second joint rather 

 longer than one-fourth of the first, cleft near apex. 



Hind legs : femur and tibia armed like the middle legs, the femur about one-third 

 longer than the tibia and tarsus taken together ; tarsus about one-third the length of the 

 tibia, cleft beyond the middle. 



Abdomen (which appears to l)e a little distorted — in (hying — in the specimen 

 described) with the sixth ventral segment a little longer than the fifth. 



Genital segments: first below subequal in length to all the abdominal ventral 

 segments, hind margin very slightly concave, sides oblique. Second segment with horns 

 reaching nearly to the apex of third below : exterior to the base of each horn is a spine- 

 like tuljerele. Third segment (PI. I, fig. 5, g.) above with the lateral angles much pro- 

 duced outwardly. 



$ . Oval, broadest about the middle. Darker in colour than the male ; middle aceta- 

 bula below, from the suture inwardly, rather broadly ochreous, shading into brown. 

 Abdomen above with the hind margins of the uncovered segments, especially the fourth and 

 fifth, rusty brown (possibly, however, this is the membrane between the segments, more 

 visible than usual) ; ventral segments (2nd to Gtli) dull In-own, ^^■ith the hind margins 

 broadly ochreous. Genital segments : first fuscous Ijrown ; second below brown ; third 

 below black. 



Head more convex than in male, the hind margin not elevated. Antemue with the 

 fourth joint quite as long as half the first, and about one-fourth longer than the second. 



Abdomen : hind margins of ventral segments rather elevated and thickened. 



It is not improbable that fresher examples of this species may be greyer in general 

 colour. 



6. Halobates sericeus, Esch. (PI. I. fig. 7). 



Halohates sericeus, Escli., Entomograpliien, i. p. 108, No. 79, Taf. ii. fig. 4, 1822. 

 Burmeister, Handb. d. Entomol., ii. p. 209, No. 2, 1835. 

 Blanchard, Hist. Nat., vol. iii. p. 98, No. 2, 1840. 

 Amyot and Serville, Hemipt., p. 412, No. 2, 1843. 



Herricb-Schaffer, Die waQzenartigen Insecteii, vol. vui. p. 110, Tab. cclsxxvi. 

 fig. 880 ?, 881 $, 1848. 



Ovate, widest a little before ( ^ ) or about ( ? ) the middle. Ashy grey. Head with the 

 usual ill-defined reddish marks at the hind margin. Autennre, legs, rostrum at base, and 

 genital segments, fuscous black, clothed more or less with grey pubescence. Hind margins 

 of the ventral abdominal segments sometimes obscurely luteous. Autcnnoe : third joint 



