DIPTEROUS TRIBE OF SPH.EROCERID^. 321 



Borborus A. c. . Meig. VI. 201. 



. . . Macq. S. a B.ll. 565. III. 



Sphaerocera, &c. Rob, D. 807. VII. &c . 



Front less produced than in Sphcerocera, some long bristles border- 

 ing the frontals : face longer : antenn^E obliquely advanced : arista 

 pubescent, the basal joint very minute : thorax smooth ; scutel 

 short, with a pair of bristles at the end : anal cell of the wino- 

 and the small one before it complete : the cross nerves remote, 

 the principal one being close to the margin, and the ."Sth main 

 nerve scarcely, if at all, continued beyond it : 3d and 4th not 

 approaching. 



A. Tibiae posticce calcari instructce. 



B. Tihice medice extrinsecus setigerce, 



Sp. 1. B. nitidus. Niger nitidiis, halteribus albidis ; alts 

 ferrugineis ; mas femoribus posticis basi uncinatis. 



Borborus nitidus, Meig. VI. 201. No. 4. 



Macq. S. a B.U, 5m. No. ]. 



Nerea nitidus . Rob. D. 803. No. 3. 

 Borborus hamatus, Ent. Mag. I. 177. 

 Curt. B. E. 469. 



Shining black : frontals dull black : arista hairy : palpi not dilated : 

 thorax with a brassy tinge : segments of the abdomen nearly 

 equal in length ; two filiform appendages beneath in the male : legs 

 hairy : the posterior coxae, the trochanters, and knees, sometimes 

 rust brown ; the middle shanks have a row of long spines down 

 the outside. In the male the thighs are very thick ; the fore pair 

 serrate below ; the hind pair longer, curved, and armed at the 

 base below with a hook : the small second spur of these shanks is 

 twisted and angular, and catches on the hook : in the female there 

 is only a tubercle in its place : the 1st joint of fore feet slightly 

 unguiculate at the tip ; the 2d joint of the hind feet is thickened, 

 and as well as the 1st, covered below with yellow down : in the 

 female the fore thighs only are thickened, and the basal joints of 

 the hind feet are more slender : poisers whitish : the wings are 

 rust yellow ; the nerves brown ; the cross nerves often darker. 

 (Length 2i ; wings, 5 lines.) 



Inhabits fungi; not abundant in England and Ireland.^ 

 In France, according to Macquart, may be found throughout 



* Found in Lanarkshire, Scotland. — Ed. 

 NO. IV. VOL. III. T T 



