EEPOET OX THE PELAGIC HEJIIPTERA. 41 



Indian Ocean localities :— Just south of Mauritius, lat. 25" S. (CoIUngivood) ; Sunda 

 Straits {Turin 3fuseum) ; lat. 2° S., lono-. 84° 20' E. {Wcsfd-oofl). 



Pacific localities : — Near Norfolk Island {Berlin Museum) ; Guinea {Sifjnoret). 



$ . Oval, widest before the middle (PI. I. fig. 1 ^ ). Whitish ash grey, paler ou the 

 sides and below; sometimes with slightly brassy reflections. The two reddish spots at the 

 back of the head more or less ill-defined. Eyes dark brown. Ptostrum shining black, apex 

 fulvous brown. Claws of the legs fulvous brown. Antennaj black, with, especially on the 

 last two joints, greyish pubescence ; the first two joints -nith an indistinct bluish tino-e. 

 Legs black ; coxjb, trochanters, and femora, especially of the middle and hind legs, and in a 

 less degree the tibire, more or less shining steel-blue. Front legs with, grey hairs, the 

 other legs with black or dark grey hairs. Underside of abdomen towards the middle at 

 the sides more or less indistinctly reddish ochreous. Genital segments more or less 

 shining bluish-black, but usually covered with greyish pubescence which is easily denuded. 



Head rather strongly convex, slightly elevated ou the mesial longitudinal line. 

 AntenncB (PI. I. fig. 1, a.) three-fifths the length of the body ; first joint rather shorter than 

 the other three taken together, slightly curved, very slightly thinner upwards, and apex 

 slightly incrassate ; second joint almost one-third the length of the first, slender, thinnest 

 in the middle, then slightly incrassate to apex ; third joint rather stout, cylindrical, 

 thickest towards the apex, about three-fourths the length of the second ; fourth joint 

 nearly one-fourth longer than the second, thickest at the base, then gradually and 

 slightly attenuate upwards. 



Pronotum with front and hind margins neai4y equally concave ; disk slightly convex, 

 with two transverse fovete on each side, of which the posterior are the largest. Mesono- 

 tian widest about the middle, disk very convex. 



Front Legs: Femora stout, thickest near the base, thence equally thick to. the middle, 

 and then slightly and gradually attenuate to the apex ; slightly notched on the inner side 

 just before the apex. The usual hairlike spines are frequently absent. Tibia nearly four- 

 fifths the length of the femur, apex strongly dilated. Tarsus (PI. I. fig. l,f-t.) about four- 

 fifths the length of the tibia ; second joint longer than the first, cleft about the middle. 



Middle Legs: Femora about one-eighth shorter than the til)ia and tarsus taken to- 

 gether ; scarcely incrassate at the apex, and rarely and obscurely armed ^dth spines. 

 Tibia (PI. I. fig. 1, m.t.) rather more than one-half the length of the femur, rarely and 

 obscurely armed. Tarsus subequal to, or slightly shorter than, the tibia, the first joint 

 more than three and a half times the length of the second. 



Hind Legs: Femur subequal in length to the tilua and tarsus taken together, rarely 

 and obscurely armed with spines. Tibia about one-fourth shorter than the femur. 

 Tarsus more than one-fourth the length of the tiljia, cleft at about two-thirds the length 

 from the base. 



(ZOOL. CHALL. EXP. — PART XIX. — 1883.) T 6 



