U\V2.) 17i) 



SoA.— DESVOiniA, ff. n. 



Gen. ch. — Eyes luitle and small ; forehead projecting, facial ant;ic 

 very oblique ; frontalia wide, occupying nearly half the head in the 

 female ; cheeks and chin large, former bare ; fronto-orbital bristles 

 extending to root of arista; anteniue long, with second joint short, 

 and third fully six times as long as second ; arista short, bare, and 

 thickened nearly to the end ; abdomen with both discal and marginal 

 sette ; wings with fourth vein bent at an angle, and without appendix; 

 first posterior cell ending some w;u' before the apex, and outer trans- 

 verse vein in the centre between the inner cross vein and the angle of 

 the fourth. 



This genus is closely allied to Metopin, but has the following dis- 

 tinctions : the facial seta? only extend half way up the face; the 

 abdomen has discal setfc ; the wings are without cubital appendices, 

 and the outer cross vein is placed centrally between the inner vein 

 and the angle of the fourth. 



D. FUSCA, S2). n. 



Metopia biserialis, Mcq. ?. 



Frontal stripe Ijroad, wider than sides, piceous in front but. pale behind ; sides 

 dnll grey ; fronto-orbital bristles numerous, in a double and partly treble row ; face 

 yRllowish-white, with dark reflections ; third joint of the antennoe stout ; arista 

 shorter than the antennae, thickened and slightly increasing in tliickness nearly to 

 the end, wliere it narrows suddenly, and terminates in a short fine point ; palpi 

 black ; thorax covered with yellowish-brown tomentum, and marked with four rather 

 indistinct stripes ; there are three outer dorso-central bristles behind the transverse 

 suture, and two in front of it ; scutellum brownish-grey ; alulets large, white, and 

 with a yellow border ; wings a little nebulous, having the fourth vein bent at an 

 angle, the apical cross vein a little curved, and the outer cross vein sti-aight and 

 oblique ; abdomen brownish-black and shining, with a cinereous band round the 

 front margins of the second and third segments, the former being quite straight and fl^gO! 

 narrow, the latter one widening in the centre, so as to cover the middle of the dorsum July, 18St-2. 

 of the segment ; there are two marginal set£B 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. 



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

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

 in M. biserialis, 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. convexinerois of tlie same 

 author, which is likewise an aberrant species of Metopia. 



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

 Dorset, on April 6th, 18'J2. 



