56 THE VOYAGE OF H.M.S. CHALLENGER. 



of the second, ochreous yellow. Third genital segment above and Ijelow browuLsh-blaek, 

 the disk of the third below and apex reddish-yellow. Antennae : third joint about two- 

 thirds the length of the second, fourth a little shorter than the second. Front tarsus : 

 first jomt about one-fifth shorter than the second, which is cleft before the middle. 

 Middle tarsus: first joint two and one-half times the length of the second. 

 $ . Length 5, breadth 2, middle femur 6, hind femur 4.5 mm. 



Habitat. — North Atlantic, near St. Heleua {Brrlin ^riisevm). Indian Ocean, near 

 Ceylon {Oxford Museum). Eschscholtz gives the South Atlantic as the locality of his 

 specimens, and Fairmau-e determined some of Cocpierel's HaJohatcs taken near Mada- 

 gascar as belonging to this species. 



$ . Oblong, A\idest in the midiUe, tlien becoming slightly and gradually narrower to 

 each end. Greyish-black in old examples (when fresh '• blue-grey, as if covered with 

 bloom "), silvery white on the sides and below. As in the allied species, the usual red 

 spots on the head are very distinct, oblique and transverse, and nearly meet at the 

 middle of the hind margin. Antennse and legs broTV-nlsh or fuscous black. Rostrum 

 shining black. Eyes dark brown. Outer rim of the front acetabula very narrowly, a long 

 triangular black-edsred blotch on, and extending in front of, the middle acetabula below, 

 a spot on the outer side of the hind acetabula, the ventral segments of the abdomen 

 (except at the sides, esjiecially of the sixth), the disk of the first genital below, and the 

 under side of the horns of the second genital, ochreous yellow. The thii'd genital seg- 

 ment above brown ish-blaek ; third Ixdow brownish-black, with the disk and apex reddish- 

 yellow. 



Head moderately convex, the edge of the hind margin distinctly elevated, except 

 near the eyes. AntenncB (PI. II. fig. 2, a.) slender, about one-half the length of the 

 body ; first joint subequal in length to the three others taken together ; second about 

 one-third the length of the first ; third aliout two-thirds the length of the second ; fourth 

 subecpial to the second, cylindrical, slightly attenuate upwards. 



Pronotum of the usual shape, disk nearly flat, slightly longitudinally convex in 

 middle, with a very slight hollow on each side of the middle. Mcsonotum slightly 

 widened to the middle, di.sk rather flat. 



Front legs : femora moderately thick, thickest a little above base ; tibia about four- 

 fifths the length of the femur ; tarsus (PI. II. fig. 2,f.t.) more than one-half the length of 

 the tibia, first joint about one-fifth shorter than the second, which is cleft before the middle. 



Middle legs : femur shorter than the tibia and tarsus taken together, armed with fine 

 spines ; tibia three-fourths the length of the femur, armed like the femur ; tarsus (PI. II. 

 fig. 2, m.t.) about one-half the length of the tibia, first joint about two and one-half times 

 the length of the second. 



Hind leg,^ : femur not quite twice as long as the tibia and tarsus together, armed 



