328 BRITISH SPECIES OF THE 



Sp. 3. L. humida. Nigra, facie albida ; scutelli setis 

 quaternis. 



Form of the last, but with much fewer and slighter bristles on every 

 part ; one only at each side of the scutel, which is not so long : 

 the face is hoary : thorax with dull blue reflections : abdomen of 

 a glaucous tinge : legs and base of the costal nerve simply pubes- 

 cent : wings obscure hyaline : nerves as in the last. 



Not rare about muddy drains, near Holy wood. Mr. Walker 

 has taken it in England also. 



DD. Halteres unicolores, vel basi pallidiores. 



Sp. 4. L. arcuata. Nigra, tibiis tarsisque ferruginosis ; 

 alarum nervo 3*'°. subarcuato ; scutelli setis bis quaternis. 



Limosina arcuata, Macq. S. a JS. II. 572. No. 4. 



Like L. limosa, face less elevated : fore coxas, both extremities of the 

 shanks, and the feet reddish brown : poisers dusky red : wings 

 obscure hyaline or brownish : nerves rust brown, costal bristly at 

 the base ; 2d main nerve extending over § of the interval between 

 the 1st and 3d, the latter curved, and terminating before the tip 

 of the wing: interval of the cross nerves one half longer than the 

 principal one: size of Z. limosa; sometimes but half the size. 



Every where rather common in shady situations, on fungi, &c. 



Sp. 5. L. geniculata. Nigra, coxis anticis, genubus tarsis- 

 que ferruginosis ; alis infuscatis ; halteribus fuscis ; scutelli 

 setis bis ternis. 



Limosina geniculata, Macq. S. a B. W. 572. No. 3. 



Resembles the last, but the wings are as in L. limosa : the scutel 

 has two bristles on each side : one half smaller than L. limosa. 



I have found this species near Holywood, and Mr. Walker 

 has taken it in England ; but it seems very uncommon. 



Sp. 6. L. crassimana. Nigra alis infumatis ; halteribus 

 fuscis; tarsis crassis; mas, tibiis anticis clavato-compressis. 



Nerea stercoraria, Rob. D. 803. No. 2 ? 



Black ; the front sometimes with a narrow reddish margin : arista 

 finely pubescent : scutel scarcely so long as the metathorax (with 

 but four bristles, as in all which follow to the end of this section) : 

 legs more pubescent than in any of the following ; spines or 

 bristles of the middle shanks scattered : feet thick ; fore pair 



