EEPOET ON THE PELAGIC HEMIPTERA. 45 



Middle legs : trochanter armod with spines ; femora as Ljng as the tiliia and tarsus 

 taken together, armed with very fine spines ; tibia more than one-half the length of the 

 femur, the basal one-third armed with fine spines ; tarsus (PI. I. fig. 3, m.t.) one-fifth 

 shorter than the tibia, first joint more than three and a half times the length of the 

 second. 



Hind legs: femur, aliout two-thirds the length of the middle femur, one-fifth longer than 

 the tibia and tarsus taken together, armed with fine spines ; tiljia aliout half as long as 

 the femur, armed with fine spines ; tarsus about five-eighths of the length of the tilna, 

 cleft a little beyond the middle. 



Abdomen : fourth dorsal segment with two obscure short transverse impressions on 

 each side of the middle. 



Genital segments : first below longer than all the ventral abdominal segments taken 

 together, strongly transversely convex, hind margin straight. Second segment below 

 concealed by the first. 



4. Halobates streatjieldanus, Templn. (PL I. fig. 4). 



Halobates sfreatfieldana, Templeton, Trans. Entom. Soc. of London, vol. i. j). 230, pi. xxii. fig. 

 A, 183G. 



Broadly ovate, widest behind the middle. Brilliant black above, brownish-black 

 below. Two small spots at the back of the head, and the sides and hind margins of the 

 fourth and fifth abdominal segments above rufous. Abdomen below with the first five 

 segments yellowish, wdth hind margins rufous. Antennae : second joint longer than the 

 third, but shorter than the fourth. Front tarsus with the joints suljequal in length. 



? . Length, O'lS inch (3-3 mm.). 



Habitat. — Atlantic Ocean, nearly midway between Africa and America south of the 

 equator. 



I have not seen this S23ecies. The above diagnosis and the following description are 

 compiled from Templeton's paper. 



$ . Broadly ovate or lozenge-shaped. Brilliant black above, brownish-black below ; 

 sides when dry somewhat hoary. Head with a rufous spot on each side of the middle at 

 the hind margin. Eyes rufous. Abdomen above with the sides and hind margins of the 

 fourth and fifth segments rufous; below with the first five segments yellowish, with 

 rufous hind margins. 



AntenncB (PI. I. fig. 4, o.) about two-thirds the length of the body; first joint slender, 

 not so long as the other three taken together ; second longer than the thu'd ; fourth 

 longer than the second, attenuating upwards. 



