Xylota. 521 



and long, pale hairs, the long marginal hairs stronger, nearly 

 bristly. Pleura with somewhat short and dense, yellow hairs, reddish 

 yellow just above. Abdomen black, dull, the first segment bluish, 

 shining, the second with a shining side margin, widening somewhat 

 triangularly inwards on the front part; the third segment with 

 similar shining spaces and the fourth quite shining, but on these seg- 

 ments it is seen only with difficulty on aecount of the densely covering 

 hairs; abdomen is clothed with short and longer, mainly yellow hairs, 

 on the second segment they are short and depressed on the dull part, 

 longer and erect on the shining parts, they are generally black on a 

 triangular space at the hind margin; at the sides they are longest and 

 specially long and paler at the basal corners; the third segment has 

 the dull part clothed with short, adpressed, black hairs, the shining 

 parts have longer, decumbent, golden hairs, which thus form a trans- 

 verse, sometimes interrupted band near the front margin, widening 

 tow^ards the sides and stretching along the side margins; the fourth 

 segment is quite covered with long but depressed, golden hairs, leaving 

 only just the front margin bare; the hairs are arranged regularly as 

 with a comb in such a way that on the middle part they are directed 

 towards the median line, on the side parts directed outwards. Genitalia 

 shining, black-haired. Yenter black, shining, with paler incisures; it 

 has short, yellow hairs, at the base they are long and whitish, and 

 they are also long at the hind margins of the segments and partly at 

 the sides. Legs with femora black, the extreme apex of anterior 

 femora yellow and all tibiæ and the three first joints of the tarsi like- 

 wise yellow; the tibiæ have aboiit the apical half or a httle more 

 darkened except along the dorsal side, which remains yellow, but the 

 darkening is only indistinctly seen on aecount of the dense hairs; the 

 hind trochanters have two short, wart-like processes below near the 

 apex; the hind femora are slightly thickened, with short, black spines 

 below on the apical half, forming two rows, the anterior row is con- 

 tinued towards the base as small spinules, not arranged in rows ; hind 

 tibiæ slightly and evenly curved; the legs have the hairs of medium 

 length, longest behind anterior femora and above hind femora; the 

 hairs are white and yellow and there are some black hairs behind 

 the apex of the anterior, especially the front femora, and the short 

 hairs on the apical part of the hind femora are black; the hairs on 

 tibiæ are dense, depressed and almost golden, below the anterior tibiæ 

 there may be some black hairs; hind tibiæ without erect ciliation 

 below. Wings slightly or a little more brownish tinged, especially on the 

 anterior part; medial cross-vein very oblique. Stigma brown. Squamulæ 

 pale yellowjsh with darker margin and fringes. Halteres pale yellow. 



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