DIPTEROUS TRIBE OF SPH^ROCERID.E. 327 



Shining black, frontals dull blackish brown ; face testaceous ; arista 

 very delicately pubescent: scutel long, with two marginal and 

 two apical bristles : fourth segment of the abdomen in the male fur- 

 nished at each angle with a long curved tuft of hair : legs lono-, 

 pubescent ; spines of the middle shanks few and distant ; 2d 

 joint of hind feet more than twice as long as first, linear, not 

 thickened. In the male the middle legs are different ; the thighs 

 are bearded and armed with a long spine at the base beneath ; 

 the shanks have a pencil of hair within, about the middle ; the 

 1st joint of the feet is compressed, hollowed out below, and 

 bearded : poisers blackish brown : wings hyaline or yellowish : 

 nerves dusky ; the costal blackish, ciliate at the base ; the 2d 

 main nerve terminating halfway between the 1st and 3d; the 

 latter a little sinuous, running to the tip of the wing : the dis- 

 coidal cell longer than usual, with its posterior angle rounded. 

 (Length If, wings, 3^ lines.) 



Abundant, particularly on fungi ; the variety with limpid 

 wings on sandy coasts 



CC. Segmentum 4*^". abdominis nudum, 

 D. Halteres nigri capitulo albido. 



Sp. 2. L. limosa. Nigra, alls infuscatis ; scutelU setis his 

 quaternis. 



Copromyza limosa, Fallen, Heterom. 8. No. 6. 



Borborus limosa . Meig, VI. 207. No. 23. 



Limosina limosa . Macq. S. a B. II. 572. No. 2. 



Nerea riparia . . Rob. D. 802. No. 1. 



Dusky black : front thickly set with bristles : face short, very 

 much elevated between the antennas, brownish : thorax often 

 dull rusty brown : scutel long, produced beyond the metathorax ; 

 with three bristles at each side, and two at the tip : abdomen dull 

 black : legs black, thinly hairy, the middle shanks thickly 

 armed with spines, and the same pair of feet bristly : 2d joint of 

 hind feet linear, twice as long as the first : poisers black, with a 

 whitish knob : wings brownish : costal nerve bristly at the base ; 

 2d main nerve continued nearly to § of the interval between the 

 1st and 3d, the latter reaching the tip of the wing: interval of 

 the cross nerves about twice as long as the principal one. (Length 

 \\ ; wings, 3 lines.) 



Very abundant on putrescent vegetable matter in most 

 situations. 



