Empididae. 



195 



the last segment is small and hidden, The exterior genitalia are small; 

 they consist of a small forceps, formed of a pair of somewhat broad 

 lamellæ, and above them there is a small, styliform process, which is 

 directed upwards. In the female the abdomen is pointed, and the 

 eighth segment forms a long, slender, compressed ovipositor, which is 

 curved a little upwards. The legs are somewhat slender, the hind 

 legs are longest; the hind femora are in both 

 sexes somewhat long and thickened, and have 

 rows of spines on the apical part below towards 

 each side; the hind tibiæ are shorter than the 

 femora, curved at the base, and when laid up 

 towards the femora, they are placed between 

 the rows of spines. The legs are short-haired, 

 only the hind femora have long hairs above in 

 the basal part, and the hind tibiæ have some- 

 what longish hairs below ; there are no, dlstinct 

 apical spurs. There are two claws, two pul- 

 villi, and a thin, somewhat claw-shaped empo- 

 dium vvith bristles on the lower side. The 

 wings have the mediastinal vein not quite 



reaching the margin; the cubital vein is unforked, and thus there is 

 one cubital cell ; the discai vein is forked, and there are thus four 

 posterior cells, and the discai cell sends three veins to the margin, 



Fig. 75. Oe. flavipes, 

 hind les. X 15. 



Fig. 76. Wing of Oe. flavipes. 



the third is the upper branch of the postical vein, which closes the 

 discai cell below; the discai cell is somewhat long, and also the basal 

 cells are long; the lower branch of the postical vein is only slightly 

 recurrent, not parallel with the margin, and meeting the anal A^ein 

 almost rectangularly; the anal vein is straight, reaching the margin; 

 the anal cell is a little shorter than the second basal cell. Stigma 

 present, sometimes very weak. The axillary lobe is large. Alula almost 

 not developed, fringed at the margin. Alar squamula small, likewise 

 fringed. 



So far as I am aware the developmental stages of the genus are not 



13* 



