324 BRITISH SPECIES OF THE 



Borborus nigrifemoratus, Macq. S. a B. II. 567. No. 5. 



Like varieties /3 y of the last : male glossy black ; the narrow 

 margin of the front testaceous : the 2d and 3d segments of the 

 abdomen equal in length : the shanks and feet brown ; the base 

 of the former testaceous ; or the posterior shanks with the middle 

 feet entirely of the latter colour ; the hind feet longer than in the 

 last : the cross nerves of the wing more remote ; the small one 

 not reaching to one-third of the discoidal cell. I have seen no 

 females, and only 2 males of this insect, and am still rather doubt- 

 ful whether it be the species cited, or really distinct from the last. 



In Mr. Walker's collection. 



Sp. 6. B. flavipennis. Niger ; facie, coxis anticis et genu- 

 bus testaceis ; halterihus albidis ; alisjlavescentibus pallido- 

 nervosis. Fem. 



Black : the frontals dull ; the triangle glossy : face and palpi testa- 

 ceous : thorax shining : abdomen dull black : 2d segment not 

 longer : legs hairy : the fore coxae and the extreme base 

 of the shanks rust-yellow : poisers whitish : wings yellowish : 

 nerves scarcely darker ; the small cross-nerve placed about the 

 first third of the discoidal cell : resembles the next species, but 

 the fore and hind thighs are thick ; the 1 st joint of the hind feet 

 almost triangular ; the 2d very little longer ; and the cross- 

 nerves are much less distant. (Length 1^ ; wings, 2| lines.) 



Found by Mr. Walker near London. 



Sp. 7. B. longipennis. Niger ; pedibus ferrugineis ; femo- 

 ribus et tibiarum opice fiiscis ; halteribus albidis; alis 

 2)allido-nerDosis ; f/ervis transversis remotis. 



Black : pubescent, with little gloss : frontals opaque: segments of 

 the abdomen nearly equal : the extremity in the male but little 

 thickened : hairy : the underside and sometimes the incisures 

 pale : legs hairy ; in the male pitchy brown, with the fore coxae, 

 and knees and the base of the shanks, rust-brown : in the female, 

 either of the same colour, or rust-yellow, with the fore and hind 

 feet, the end of the shanks and of the posterior thighs, brown : 

 the spur springs before the extremity of the hind shank and is 

 very slender and long : the 2d joint of the hind feet is one-half 

 longer than the 1st, and a little thickened : in the male, the first 

 joint of the fore feet is very distinctly unguiculate ; poisers 

 whitish : wings hyaline with pale nerves ; the small cross-nerve 



