402 Syrphidae. 



lum yellow or dark yellowlsh, translucent, with black hairs. Pleura 

 with long, black hairs. Abdomen short, ovate; it is black, shining, 

 «^enerally more or less dark and indefinitely reddish on the sides of 

 second and third segments so that someLimes only a black middle 

 line is left; it is densely haired with somewhat long hairs, longest 

 behind; the hairs are black on the basal part but reddish or some- 

 times yellowish at the apex from about the middle of the third seg- 

 ment; at the basal corners the hairs may be a little brownish. 

 Genitalia black-haired. Venter black, shining, with long hairs, black 

 at the sides, yellowish brown in the middle. Var. plumata : The hairs 

 on occiput generally yellow above. Thorax with only the middle 

 front part black-haired, the sides and hind margin more or less 

 broadly yellow-haired and scutellum yellow-haired. Abdomen with 

 the side spots on second segment yellow and yellow-haired, stretching 

 more or less in towards the middle, and with the fourth segment and 

 the hind margin of the third yellow-haired, sometimes (var. haemor- 

 rhoidalis Zett.) more reddish-haired. Legs all black, the base of the 

 anterior tibiæ and tarsi may be more or less reddish, generally only 

 indistinctly. The legs densely black-haired; the hairs are somewhat 

 long on the posterior and ventral side of anterior femora and on the 

 anterior and ventral side of hind femora; the other hairs are con- 

 spicuous and not quite short, the anterior tibiæ have a moderately 

 long fringe on the postero-dorsal side, and the hind tibiæ are a little 

 fringed all round, especially on the somewhat swollen middle part. 



Fig. 150. Wing of Y. bomhylans d". 



Wings yellowish tinged, the base blackish brown and there are two 

 brown patches, one larger below the stigma down to the discai cell, 

 the other smaller seaming the veins at the end of the subcostal 

 and first posterior cells. Squamulæ with their fringes black, and 

 balteres black. 



Female. Frons moderately broad, orange, haired with long, yellow 

 or mixed black and yellow hairs, in var. plumata they are yellow. 

 Antennæ and arista longer than in the male. Eyes bare. For the 



