152 [June, 



leticocephala , and have often been confounded with it ; they differ, however, by 

 being usually rather smaller, by having the frontal stripe (which extends to the base 

 of the antennse in both sexes) narrower, it not being wider than the sides of the 

 frontalia ; by the facial setse being less ; by the thorax being of a lighter grey and 

 more distinctly striped ; by the abdomen also being more cinereous, and marked by 

 more clearly defined triangular spots ; lastly, the arista is not thickened quite so 

 far. The males and females are very much alike, but can be distinguished by the 

 difference in the fronto-orbital bristles, those of the male being only in a double row 

 at the back part. Rare. It is in Mr. Dale's collection, and I captured a single 

 specimen in Kent in 1888. 



M. CAMPESTRIS, Eln. 

 Frontal stripe much wider than the sides of frontalia ; forehead slightly promi- 

 nent ; sides with face silvery-white, with dark reflections ; cheeks without any hairs ; 

 arista with only basal third thickened (Meigen and Schiner say half) ; thorax with 

 four moderately wide dorsal stripes, and three post-sutural outer dorso-central 

 bristles ; abdomen with silvery-white reflections, a central row of subtriangular spots 

 and transverse sinuous bands, forming semilunar or irregular triangular spots on the 

 sides of the segments ; the male is usually more distinctly marked than the female, 

 and has the fronto-orbital bristles only double at the hinder part; in other points 

 this species resembles the former ones. Not common. 



M. AMABILIS, Mgn. 

 This closely resembles M. campestris ; the chief points of difference are that 

 the forehead is a little more prominent, the arista is only thickened for a short 

 distance at <he base, and the longitudinal and transverse bands on the abdomen are 

 nearly straight instead of being maculiform. Very rare. 



M. EUBRITATJSIS, Ztt. 



JlavifarseUa, Ztt. 

 Masicera ritjltarsis ?, Mgn. 

 Forehead slightly prominent ; face oblique ; eyes rather nearer together in the 

 male than in the female ; frontal stripe mvich wider than the sides of the frontalia ; 

 black behind with grey reflections and red in front; sides of frontalia, like face, 

 silvei'y-white, with grey reflections ; fronto-orbital setse small and far apart, ex- 

 tending to base of antenna) only, they ai'e in a double row behind in the male ; 

 vibrissse small ; facial setfe minute, and extending up two-thirds of the face ; palpi 

 black with rufous ends ; antennse black or grey, third joint fully six times as long as 

 the second ; arista short and thickened for three-fourths of its length, then abruptly 

 ending in a fine short bristle ; thorax dark grey on the dorsum, with the shoulders 

 and sides silvery-white, the white part extending a little across the transverse 

 groove ; in some lights two central black stripes are visible in the male, in the 

 central part is shiny black ; post-sutural outer dorso-central bristles three in num- 

 ber ; abdomen subcylindrical, with thick apex in the male, ovoid and rather flattened 

 in the female, grey with black bands, which form three irregular subtriangular spots 

 on each segment in the male, but coalesce on the dorsum in the female, leaving it 

 uniformly black, with only the spurs of three whitish bands on the sides ; the seg- 



