DIPTEROUS TRIBE OF SPHiEROCERID^. 3'25 



usually at the first fifth of the discoidal cell, (Length 1| ; wings, 

 3 lines.) 



On the sea coast of Ireland ; in various parts of England ; 

 not rare. 



Sp. 8. B. vitripennis. Niger ; halleribus albidis ; alishya- 

 linisfusco-nervosis, nervis transversis remotis. 



Borborus vitripennis, Meig. VI. 206. No. 20. 



Resembles the last in most points : is entirely black : the frontals 

 very deep and opaque ; black : the triangle and thorax shining : 

 the abdomen of the male is clavate at the end and less hairy : legs 

 entirely black ; base of the poisers blackish : wings with the 

 nerves more evident from their dusky colour ; the cross nerves 

 scarcely so remote. (Length 1 ; wings, 2^ lines.) 



On sandy coasts of Ireland ; shores of Cornwall. Mr. 

 Walker. 



Varies with the legs less hairy and much longer, the 2d joint of the 



hind feet not thickened. 



Found by Mr. Walker on the shores of Cornwall. 

 AA. Tihice posticce ecalcaratce. 

 Sp. 9. B. ater. Niger nitidus, glaber, /route antice et 



genubus testaceis; halteribus albidis. 



Borborus ater . Meig. VI. 203. No. 11. 



B. geniculatus, Macq. S. a ^. II. 567. No. 6. 



Glossy black, nearly glabrous : fore margin of the front and sides 

 of the face testaceous : frontals almost naked, narrow, dull black : 

 arista very slightly pubescent : scutel flat, semicircular, the terminal 

 bristles minute : segments of the abdomen nearly equal : legs 

 rather short and almost naked ; the fore thighs thick and shining : 

 the extreme base of the shanks, in general also the fore coxos and 

 the base of the middle feet, pale testaceous : the 2d joint of 

 the hind feet not dilated, nor is the 1st of the fore pair unguicu- 

 late in the male : poisers whitish : wings hyaline ; nerves brown ; 

 the middle of the costal blackish ; the small cross nerve a little 

 above the middle of the discoidal cell. (Length H ; wings, 3 lines.) 

 Every where common. 



Gen. III. — Apterina. 

 Borbori, modo alee et halteres abbreviati. 

 Borborus B. Meig. VI. 209. 

 Apterina . Macq. S aB.U. 513. VIII. 



