Microdon. 583 



with longish, somewhat decumbent, yellow or yellowish white hairs. 

 Occiput æneous green, the hairs whitish below, yellowish above. An- 

 tennæ black, third joint often more or less brownish; the third joint 



Fig. 197. Antenna of 31. mutahilis d", from the inside. X 40. 



about twice as long as the second ; arista much shorter than the third 

 joint, brownish. Thorax æneous green, shining, with traces of some 

 stripes; it is clothed with yellow or reddish yellow hairs. Scutellum 

 brownish red, sometimes a little æneous at the base; it is densely 

 clothed with hairs like those on thorax but of a more reddish colour. 

 Pleura green with long, yellowish white hairs; the bare, wedge-shaped 

 space above the front coxæ quite polished. Abdomen black or greenish 

 or bluish black, densely punctate, dull, a little shining at base and 

 apex and here also the most bluish or greenish; it is clothed with 

 short, decumbent hairs, which are very short and black on a little 

 rnore than the front half of third segment and on the front part of 

 fourth segment, but longer and golden or silvery on the hind margins 

 of second and third segments and on the hinder three fourths of the 

 fourth segment ; abdomen is thus black with two bands and the whole 

 hind part golden or silvery from hairs; the middle band is generally 

 narrowly interrupted by black hairs, and these also form a triangle 

 stretching in on the hind part of fourth segment; at the sides the 

 hairs are all golden or silvery, and at the basal corners there are 

 longer erect, yellow or whitish hairs. Genitalia red or brownish red, 

 with short, pale hairs. Venter blackish, shining, with longish, pale 

 hairs, shorter and dark on the middle of the fourth segment. Legs 

 with the femora black or æneous black with the apex reddish yellow ; 

 tibiæ and tarsi yellow, the tibiæ with a more or less distinct narrow, 

 oblique dark band below the middle; the tarsi broad and flat, especi- 

 ally the hind tarsi and hind metatarsi somewhat swoUen; the hairs 

 on femora rather short, on tibiæ and tarsi dense and relatively long; 

 they are all yellow. Wings a little brownish tinged, the marginal 

 cross-veins may be slightly dark seamed. Squamulæ and fringes pale 

 yellow. Halteres yellow. 



