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



line runs forward along the side to about the middle, forms a loop upwards and back- 

 wards, and joins an oval blotch on the disk behind the reddish-browTi blotch ; from the 

 oval blotch a short straight line joins the longitudinal central line at right angles ; more 

 posteriorly to this another transverse line crosses the longitudinal line and connects the 

 anterior ends of the connexivum, and from each end a slender curved line runs forwards 

 and outwards to the looped line. The above-mentioned markings are black or fuscous 

 black. Abdomen more or less black, posterior segments with the angles of the connex- 

 ivum, and genital segments with the centres, dirty testaceous. Antennae (which are 

 broken in the male) yellowish testaceous, gradually suffused upwards with fuscous brown, 

 more especially on the under and outer side; second and third joints fuscous brown, 

 the jointlet reddish-brown, fourth joint dirty testaceous suffused with fuscous. Front 

 legs less strongly marked than in the male. 



Antennce (PL II. fig. 4 a.) (broken in the male) about three-fourths the length of the 

 body ; first joint slender, furnished at the upper and inner side with fine rather long 

 spine-bke hairs ; second joint about half as long as the first, also with spine-like hairs ; 

 third joint subequal in length to second, but more slender ; fourth about three-fourths the 

 length of third, and slightly thicker. 



Front legs (PI. II. fig. 4 $ f.l.) not so stout as in the male ; femur without the central 

 tubercle, and with the notch at apex sub-obsolete, armed below with a few long hair-like 

 spines. 



Ahdomen{V\. II. fig. 4 ? ah. a., and 4 ? ah. h.) : sixth segment below as long as the 

 two preceding segments, sides a little produced. 



Genital segments : two visible above ; first ring-like and resembling the last abdominal 

 segment ; second small, transversely convex, broader than long, hind margin straight. 

 One visible below, longer than all the abdominal ventral segments taken together, convex, 

 triangular, apex slightly concave ; at the middle of each side with a notch from which a 

 fold curves inwards and then forwards. The side margins, which are continuous with 

 the connexivum, embrace the sides of the two segments above. 



2. Halobatodes histrio, n. sp. (PI. II. fig. 5). 



Halobates histrio, De Haan, MS. 



Widely ovate, widest about the middle, then paraUel-sided. Dull yellowish testaceous 

 above, with black or brownish-black Lines and spots, of which the central longitudinal 

 line on the thorax does not reach the abdomen. Dirty ochreous below. Genital segment 

 below of the female -n-ithout a notch at the middle of the sides. 



$ . Length 6, breadth 3'5, middle femur 6'5, hind femur 6"5 mm. 



Habitat. — Japan {Berlin Museum). 



Very similar to Halohatodes lituratus in form and colour, but diiiers in its rather larger 



