18lt2.J 129 



tennse with thii-d joint about three times the length of second, which is somewhat 

 elongated ; arista thickened almost to the end, and rather short ; facial setse extend- 

 ing fully one-third of the way up the face, which is white, with dark reflections ; 

 palpi black ; thorax marked with four stripes, the middle pair being narrow, and the 

 outer ones wide and irregular in shape ; outer dorso-central bristles four behind the 

 groove ; scutellum grey ; abdomen hoary, with a narrow black (often indistinct) 

 dorsal stripe, and wide irregular black bands on the hinder parts of the segments ; 

 discal and apical setse both present j wings with one small bristle at the base of the 

 third vein, and with the apical cross vein a little curved ; legs black. I do not know 

 the male, but Rondani says the sexes are difficult to discriminate. Not common. 

 I have named this species myoidcea, after Desvoidy and Macquart, though Eondani 

 considers it to be the M. senilis, of Meigen. It corresponds closely to the descrip- 

 tion of M. myoidcea given by Macquart ;* therefore, Desvoidy's name has the 

 priority ; besides which, Meigen, in his account of M. senilis, states that the arista 

 is only thickened at the base (Wurzel) instead of nearly to the end, and Rondani 

 makes the thickened arista the characteristic feature of the species. 



M. JUVENILIS, End. 



Male, shining black, with some grey pubescence on front and sides of thorax ; 

 face very oblique, eyes widely separated ; fronto-orbital bristles in a single row, 

 frontal sti'ipe piceous, rather wider than sides of the frontalia, which are of a bluish- 

 grey colour ; the face is white, with black reflections, the lower part, with peristome, 

 being rufous ; facial setse wanting ; antennae with the third joint fully four times the 

 length of second, which is short ; arista short, thickened almost to the end ; palpi 

 black ; thorax with four stripes of nearly equal widths ; outer dorso-ceutral bristles 

 four behind the groove ; scutellum black ; abdomen bright black, conical, with 

 narrow white bands on the front margins of the segments, which have discal as well 

 as apical setae ; wings with a single bristle at base of third vein, and apical cross 

 vein nearly straight ; legs black. The female is covered with hoary pubescence, has 

 the abdomen oval, with irregular broad black and white bands, but it is in other 

 points like the male. I captured a male of this rare species near Bicester (Oxon.) 

 in June, 1880, and found a female in the late F. Walker's collection. 



M. EGENS, Egger. 



Black, uniformly covered with hoary pubescence ; frontalia wide, middle stripe 

 piceous, narrower than the sides, which are whitish-grey ; face white and oblique ; 

 antennae light grey, with third joint narrow, rather pointed, and about four times as 

 long as the second ; arista long and capillar, thickened for about one-fourth of its 

 length ; facialia with only a few setse at the base ; palpi piceous or black ; peristoma 

 rufescent ; thorax with four slender black stripes, and four outer dorso-central 

 post-sutural bristles ; scutellum grey ; abdomen conical, uniformly grey and immacu- 

 late, unless detrited ; segments with discal setse ; wings tinged with yellow ; apical 

 ci'oss veins straight, outer cross ones sinuous ; legs black. Rare. 



M. PAiiYA, Mcq. 



Pale grey ; face oblique, eyes wide apart ; frontal stripe ferruginous, narrower 



Ann. Ent. de France, s. 11, vol. viii, p. 



