Platypeza. 



35 



W:- 



yellow at apex. Thorax velvet black, dorsocentral hairs short, some- 

 what pluriserial; two notopleural bristles. Pleura blackish brown, 

 palest below. Abdomen flattened, duU brown, with 

 the hind margins of the segments velvet black, the 

 sixth segment grey on apical part and liypopygium 

 grey. Abdomen has short, very sparse brownish hairs, 

 longer at the sides and longest at base; sixth segment 

 with a row of yellow bristles. Legs yellow or brownish 

 yellow, the femora darkest; hind tibiæ somewhat and 

 the four first tarsal joints much dilated; first and second 

 joint of nearly equal length and third joint as long as 

 the two first together. The legs with some long hairs 

 on posterior side of anterior femora, hind femora 

 mainly short-haired ; middle tibiæ with only one apical 

 spur. Wings nearly pellucid; veins brown; medial cross- 

 vein well before apex of mediastinal vein; 

 lower branch of fork not short, but not 

 reaching the margin; posterior cross-vein 

 rather steep, shorter than or scarcely as 

 long as its distance from the fork; anal cell 

 rather long, double the rest of the anal 

 vein. Squamula and balteres brownish. 



Female. Rather different. Frons broad, grey, 

 almost or quite bare; occiput with pale hairs below. 

 Thorax greyish brown, with an indication of two 

 stripes. Abdomen brown with first segment grey and 

 grey hind margins on second to fifth segment, widening 

 at the sides and here confluent ; as the grey is predomin- 

 ating abdomen may be termed grey with four bands 

 and apex brown. Abdomen with short, very sparse pale 

 hairs. Legs yellow; hind tarsi strongly dilated, more 

 than in male, the two first joints quite short and short- 

 ened below, third joint longer than the two first together 

 and very long below; the golden toment on posterior 

 side conspicuous; middle tarsi somewhat dilated, second 

 joint short, third longer, fourth again short, fifth 

 distinctly dilated. Legs quite short-haired, femora 

 nearly bare. Wings with the lower branch of the fork reaching near 

 to the margin. Squamulæ and balteres yellow. 

 Length 3 to about 4 mm. 



3* 



Fig. 8. 



P. boletina ^ , 



hind leg from 



anterior side 



X ca. 45. 



Fig. 9. 



P. boletina $, 



hind leg from 



anterior side 



X ca. 46. 



