90 Syrphidae. 



pruinose, the hairs yellow above, downwards and on the jowls white; 

 at the upper eye-margin ot few dark hairs, Aritennæ not specially 

 short, third joint distinctly longer than broad; arista shorter than the 

 antennæ, thickened in about the basal two thirds; the antennæ are 

 black but second and third joints generally brown or blackish brown ; 

 arista brown, palest at the base. Eyes densely brown- or pale brown- 

 hairy. Thorax black, rather densely punctate, shining; it is densely 

 clothed with long, greyish yellow hairs, longest on scutellum; pleura 



Fig. 28. Antenna of P. lugubris c^, from the inside. X 80. 



with black hairs above, pale below. Abdomen black, coarsely punc- 

 tate but however somewhat shining, less at the base; it is clothed 

 with short, yellow or greyish yellow hairs, but at the incisures the 

 hairs are black, and the black pubescence may be extended so that 

 the pale hairs only form a band on each side of third and fourth 

 segments; at the base the hairs are somewhat long. Venter trans- 

 lucent, blackish at the end, with long hairs which are pale on the 

 basal part but black on the last segment. Genitalia with dark hairs. 

 Legs black, knees distinctly yellow or reddish yellow this colour in- 

 cluding the basal part of tibiæ; tarsi yellowish with the two last 

 joints brown or blackish, also hind metatarsi more or less darkened. 

 Hind femora rather distinctly thickened, hind metatarsi not much 

 thickened. Legs haired in the usual way with pale hairs, behind 

 the front femora and at the tip of the posterior femora the hairs are 

 dark; also the hind tibiæ mainly dark-haired and with a conspicuous 

 fringe above: sometimes the legs almost quite pale-haired. Wings 

 hyaline or slightly yellowish. Stigma brown, below it a well defmed 

 brown blotch. Squamulæ more or less dirty whitish, the margin 

 generally darkened. Halteres yellow. 



Female. Antennæ larger and longer than in the male, third joint 

 rather large, and likewise longer than broad. Frons fmely punctate, 

 the side dust spots rather large; it is white-haired with darker hairs 



