REPORT ON THE PELAGIC HEMIPTERA. 4«> 



Pvonotuhi of the usual form, disk somewhat Hat, rather lioUowed in the middle 

 posteriorly, and with a transverse fovea on each side anteriorly. Mesonotuni widest a 

 little behind the front margin, disk veiy convex. Mcsostermmi with a very indistinct 

 percurrent longitudinal mesial line. 



Front legs : femora very stout (comparatively), nearly equally thick to middle, then 

 narrowing to apex ; tibia about four-fifths the length of the femur ; tarsus (PI. I. fig. 7,f.t.) 

 about three-fifths the length of the tibia, first joint two-fifths the length of the second, 

 which is cleft about the middle. 



Middle legs : trochanters armed on inner side with short spines, as is the femur ; femur 

 rather shorter than the tibia and tarsus taken together ; tibia a little shorter than the 

 tarsus ; tarsus (PI. I. fig. 7, m.t.) first joint seven times as long as second joint. 



Hind legs : femur armed as middle femur, about one-fifth longer than the tibia and 

 tarsus together ; tibia armed on all sides with scattered small spines ; tarsus cleft at 

 about two-thirds of the length. 



Abdomen : peculiarities of the connexivum have been noticed in tlie generic 

 description. 



Genital segments : first below as long as four of the abdominal ventral segments, 

 transversely convex, sides parallel. Second with the horns reaching about three-fourths 

 the length of the thii-d below ; the margins of the horn (PI. III. fig. 24) are not 

 thickened, and on the basal half are a few long hairs pointing inwards, and arising from 

 the disk ; apical half of the disk set with short, stout, outward-pointing teeth ; near the 

 base of the horn, and between it and the posterior angle of the segment, is a tubercle. 

 Third segment above (PL I. fig. 7, g.), with the lateral angles moderately produced; on 

 each side below is a patch of sharp spines pointing forwards. 



$ . Ovate, widest at about the middle. Hind margins of the ventral abdominal seg- 

 ments sometimes luteous. 



Head and mesothorax more convex than in the male. 



Front tibia nearly as long as femur. 



Middle legs : trochanters unarmed, femora less strongly armed. Sometimes the 

 middle and hind legs are scarcely armed. 



Abdomen below (PI. I. fig. 7, ? ab. b.) : segments 1st to 5th, each rather elevated 

 in transverse middle line ; sixth with a suboblique transverse furrow not quite reaching 

 the middle. 



Genital segments: first below as long as three of the ventral abdominal segments 

 together, transversely convex, sides tumid, hind margin straight in the middle, each 

 side somewhat oblique. 



HalobaAes sericeus has been found in ]\Iarch, April, June, July, and October, but pro- 



(ZOOU CHALL. EXP. —PART XIX. 1883.) T 7 



