DIPTEROUS TRIBE OF SPH^EROCERID^. 331 



cell of the wings are much narrower, the cross nerves less distant : 

 the legs sometimes are entirely ferruginous ; in others the thighs 

 and the middle of the shanks are pitchy ; or the legs are blackish, 

 with the knees and feet ferruginous : wings brownish, with distinct 

 brown nerves, the costal not incrassate : from the following it 

 differs by the wings, the 2d joint of the hind feet not thickened, 

 &c. ; but I am not satisfied that all these varieties belong to one 

 species, or that some of them may not connect the present with 

 the last. 



Sp. 13. L. clunipes. Nigro-fusca facie pedibusque ferru- 

 gineis ; halteribus fuscis ; alis hyalinis : tarsorum posti- 

 corum arliciilis duobus incrassatis. 



Borborus clunipes, Meig. VI. 208. No. 26. 



Limosina clunipes, Macq. S. a B. II. 573. No. 7. 



Dusky : margin of the front and the face ferruginous ; arista thickly 

 pubescent : breast and legs ferruginous : 2d joint of hind feet 

 nearly twice as long as 1st, and a little thickened : wings hyaline : 

 the nerves nearly colourless, disposed as in the following; the 

 costal ferruginous, slightly ciliate at the base, but without a spine, 

 and a little thickened along the middle : scarcely so large as 

 No. 18. 

 Occurs along with No. 6, but rare. Mr. Walker takes it in 



England. 



Sp. 14. L. spinipennis. Nigra pubescens halteribus nigris ; 

 alis denigraiis, cost a incrassata, basi spinigera. 



Rather dull black : face elevated between the antennae : arista with 

 thick black pubescence : thorax thickly pubescent : more bristles 

 on the middle shanks than in L. fungicola ; 2d joint of the hind 

 feet scarcely thickened : poisers black : wings blackish : costal 

 nerve thickened along the middle, somewhat bristly at the base, 

 with a long erect spine springing near the root : 2d nerve ending 

 halfway between the 1st and 3d ; interval of cross nerves rather 

 longer than the principal one : size of No. 18. 



Occurs but rarely, in company with No. 6. 



Sp. 15. L. heteroneura. Nigra, facie pedihusque ferru- 

 ginosis ; alis irfnscatis, nervis transversis fere contiguis. 



Black, pubescent : face reddish : arista thickly pubescent : legs nearly 

 naked, dusky ; the fore pair, the knees and shanks rust brown : 

 middle shanks with a pair of bristles only on the outside : poisers 



