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



Pronotum gently clianneled into three subequal divisions, scarcely \Ti5ible in the dried 

 specimen. 



Front legs (PI. I. fig. 4, f.l.) : tarsus (PI. I. fig. i,f.t.) with the joints subequal, the 

 second cleft about the middle. 



Templeton's full description, as also the account of the capture of the specimen, wHl 

 be found in the first part of this paper. 



5. Halobates sohrimis, n. sp. (PI. I. fig. 5). 



Long oval, wddest behind middle ( ^ ), or oval, widest about the middle ( ? ). Ashy 

 grey {$ ), or dark grey ( ? ), paler below. Head with two ill-defined rufous spots pos- 

 teriorly. Antennae and legs dull fuscous black. Abdomen : hind margin of fourth dorsal 

 segment rusty brown, genital segments dull fuscous black {$) ; or ventral segments dull 

 brownish, hind margins broadly ochreous, first and second genital segments brownish 

 below, middle acetabula below from the suture inwardly rather broadly ochreous ( ? ). 

 Antennae : third joint rather more than one-fourth shorter than the second, which is one- 

 fourth shorter than the fourth. Front tarsus : first joint about one-quarter of the length 

 shorter than the second. Middle tarsus : second joint rather more than one-quarter of 

 the length of first. 



^ . Length 4, breadth 1"75, middle femur 5, hind femur 4"5 mm. 



? . Length 4, breadth 2, middle femur 4, hind femur 3 mm. 



Habitat. — Tahiti [Stockholm Mitsetmi). 



Z . Long oval, widest behind the middle. Ashy grey, somewhat paler below. 

 Head with the usual ill-defined rufous spots. Antennae, legs, first genital segment below, 

 and genital segments above, dull fuscous black, with more or less sparse grey pubescence. 



Head with the hind margin very slightly elevated on each side of the middle. 

 Antennce (PI. I. fig. 5,o.) about three-fifths the length of the body; fii'st joint shorter than 

 the other three taken together ; second joint about one-half the length of the first ; thii'd 

 about three-quarters the length of the second ; fourth about one-quarter longer than the 

 second, attenuate from the middle upwards. 



Pronotum : front margin rather strongly concave, hind margin slightly concave ; disk 

 slightly convex, with a very fine impressed longitudinal central line, on each side of 

 which is an anterior transverse fovea. Mcsonotum gradually ■nddeued to beyond middle, 

 disk convex, with a very fine percurrent longitudinal central line. 



Front legs : femora rather stout ; tibia subequal in length to femur ; tarsus (PI. I. 

 fig. 5,f.t.) al;)out two-t*hirds as long as tibia, first joint about one-fourth shorter than the 

 second, which is cleft before the middle. 



