Xylota. 519 



Male. Vertex black, long but not narrow, eye-suture somewhat 

 short; frons somewhat prominent, black and shining; epistoma black, 

 shining, only a little pruinose at the sides of the antennæ and bclow 

 from the upper mouth edge towards the eyes; it has the mouth edge 

 rather prominent; vertex black-haired, frons with only some single 

 hairs at the eye-margins and epistoma with only a row of white hairs 

 at each eye-margin. Occiput bluish black, shining, a little pruinose 

 along the eye-margins below; the hairs not long, brownish below, 

 yellowish above and here some black hairs. Antennæ reddish, first 

 joint black, third joint short, not longer than high; arista not long, 

 brownish yellow, pale towards the apex. Thorax blackish or dark 

 æneous, not very shining, with indications of two or four darker 

 stripes; inwards to the humeri it has a small, whitish pruinose spot; 

 it is clothed with short, mainly yellow^ hairs and' has on the whole 

 disc longer, mainly black hairs, longest behind; above the wing-root 

 are short, black hairs. Scutellum has short and long, pale hairs, the 

 hairs along the margin not bristly. Pleura black, shining, with not 

 dense, blackish, behind and downwards pale hairs. Abdomen long, 

 the fourth segment unusually long and swollen in the basal part; the 

 abdomen is black or bluish black, shining, but duU along the middle 

 and on the hind parts of second and third segments so that the shining 

 parts form here two large basal corner spots; it is clothed with short 

 hairs which are white but black on the duU parts and on fourth seg- 

 ment, on this latter are only some white hairs at the end of the 

 swollen front part; the hairs are longer towards the sides and long 

 at the basal corners; they are all white at the side margin excopt 

 just at the hind corners of the segments and on the last part of the 

 fourth segment. The genitalia are more or less, often quite retracted 

 into the long fourth segment. Venter black, shining, with long, white 

 hairs, black at the apex. Legs red or yellowish red, coxæ, trochanters, 

 the apex of hind femora and the hind tibiæ and tarsi black; hind troch- 

 anters simple, hind femora somewhat strongly thickened, especially 

 towards the apex, which is somewhat abruptly attenuated ; below there 

 are yellow hairs, becoming black and more bristly outwards, and only 

 below the apical part are somewhat short, black spines, not arranged 

 in rows; hind tibiæ somewhat compressed, evenly curved; the legs 

 not long-haired, the hairs long only behind the front and especially 

 the middle femora; the hairs are yellow, behind the apex of middlo 

 femora there may be a few black hairs and they are partly black on 

 the posterior side of hind femora and black on the black apex and 

 on the hind tibiæ; these latter with a short, erect ciliation below in 

 the whole length. Wings somewhat brownish tinged ; medial cross-vein 



