Erislalis. 407 



middle; tarsi more or less darkened towards the end. Legs with short, 

 black hairs, a little longer on the femora in the usual way; anterior 

 tibiæ with some strong bristles on the posterior side in the basal half, 

 middle femora with similar bristles at the apex behind, and middle 

 tibiæ besides the posterior bristles with one ventral below the middle 

 and numerous round the apex; middle tarsi with spinules below the 

 apex of the joints. Wings yellow, especially on the anterior part, and 

 with a slight cloud below the stigma and about the apex of the sub- 

 costal eell. Squamulæ with their fringes and the balteres orange. 



Female. Vertex and frons somewhat narrow, but broader than 

 in pellucens, widening downwards from below the middle; they are 

 yellow with black hairs. Eyes bare. Antennæ slightly larger than in 

 the male. Abdomen with the hind margin of fourth segment more 

 broadly black and the hind margin of the fifth narrowly black. 



Length about 16 mm, 



F. inanis is very rare in Denmark, we have only four specimens 

 from earlier time, all females, without particular locality. 



Geographical distribution : — All Europe and also recorded from 

 Syria; towards the north to middle Sweden. 



III. Eristalinae. 



29. £pistalis Latr. 



Large or somewhat large species, moderately haired or sometimes 

 densely and velvet pilose ; they are of black or æneous colours, gener- 

 ally with yellow abdominal markings, most often as side spots, especi- 

 ally at the base. Head somewhat semiglobular, broader than high 

 and about as broad as or slightly broader than thorax; it is slightly 

 excavated behind. Eyes touching in the male for a shorter or longer 

 distance, in one (Danish) species separated (Subg. Eristalinus); in the 

 female they are broadly separated. The eyes are more or less densely 

 hairy but the lower hinder part bare, especially in the females; in 

 some species there are two longitudinal bands of denser hairs, or one 

 band or only an indication of a band; in one species (aeneus) the 

 eyes are hairy only just above. The eyes are unicolorous or some- 

 times spotted, or (in non-Danish species) with numerous transverse 

 bands. The eye-facets are slightly enlarged above in the male. The 

 antennæ are inserted in or slightly above the middle of the head; 

 they are rather small, the first joint very short, the third joint gener- 

 ally roundish square; the second joint has small bristles above and 

 below, the third is microscopically haired; the arista is either plumose 



