180 IJnly, 



front margins of the second and third segments, the former being quite straiglit and 

 narrow, the latter one widening in the centre, so as to cover the middle of tlie dorsum 

 of the segment ; there are two marginal setee in the centre of the first segment, two 

 near the margin of the second, as well as two on the middle of the disc ; there are 

 two again on the disc of the third segment, as well as several on the sides, with two 

 in the middle of the posterior margin ; legs black, and very spinose, with the outer 

 sides of the hind tibiae irregularly ciliated. Length, about 5 mm. 



This species, by its characters, closely resembles those given by Macquart of his 

 Metopia hiserialis ; it differs, however, by the position of the outer cross vein, which, 

 in M. hiserialis, is said to be one-third nearer to the bend of the fourth vein than to 

 the inner cross one. It is also nearly allied to the M. convexinervis of the same 

 author, which is likewise an aberrant sjDecies of Metopia. 



A female of this little fly was found by Mr. C. W. Dale, at Glanvilles Wootton, 

 Dorset, on April 6th, 1892. 



35b.— DEaEEEIA, Mgn. 



Gen. cJi. — Ej^es nude ; forehead slightly prominent ; facial angle 

 a little oblique ; frontalia narrow in the male, but moderately wide in 

 the female ; fronto-orbital bristles extending to about the root of the 

 arista; facial setae ascending half or more than half way up the 

 facialia ; antennae with the third joint from three to six times longer 

 than the second ; arista sometimes pubescent ; cheeks bare ; abdomen 

 usually with both discal and marginal setse ; wings with fourth vein 

 mostly bent in a curve, and outer cross vein placed midway between 

 the inner one and the bend of the fourth ; first posterior cell ending 

 near the tip of the wing. 



1 (8) Palpi black. 



2 (3) Thorax glistening white, in front of the transverse suture...!. coUaris, Fin. 



3 (2) Thoi'ax with the shoulders, or front margin only, white. 



^ (5) (6) Thorax marked with two black lines 2. blanda, Fin. 



5 (4) (6) Thorax unstriped 3. pulcJiella, Mgn. 



6 (5) (4) Thorax with four distinct stripes 4. ffrandicornis, Zett, 



7 (6) Thorax with four short and almost confluent stripes 5. pygmcBa, Mcq. 



8 (1) Palpi pale 6. muscaria, Flu. 



D. COLLAEIS, Fin. 



ornata, Mgn. 

 Frontal stripe black, rather wider than sides of frontalia, which, like the cheeks, 

 are glistening white, with dark reflections ; antennge grey ; arista long, slender, 

 slightly pubescent, and thickened along its basal third ; facialia ciliated most of the 

 way up ; palpi black ; thorax shining black, clothed in front as far as the transverse 

 suture with snow-white pubescence, and marked on the anterior margin with four 

 short black lines, which are often partly confluent ; in the female the hinder half 

 has a grey shine or reflection ; there are three post-sutural outer dorso-central setae j 

 scutellum black ; halteres yellow ; abdomen oblongo-conical, bright black, with in- 



