Xanthandrus. 237 



and frons with dark brown or blackish hairs, the frons bare on the 

 shining space; epistoma with yellowish hairs on the sides; it is some- 

 what retreating downwards, the central knob moderately prominent, 

 less than the frontal prominence. Occiput greyish pruinose, the hairs 

 all yellow. Antennæ not small, third joint considerably longer than 

 broad; they are brownish red, the end and upper margin of third 

 joint more or less darkened and sometimes the joint rather darkened ; 

 arista brownish. Thorax greenish æneous, shining, somewhat fmely 

 punctate; it has a double pubescence of somewhat long, erect and 

 short, more decumbent hairs, all yellow ; the hairs are longest behind 

 and on scutellum. Pleura somewhat pruinose, yellow-haired. Abdomen 

 duU, a little shining at the extreme base and at apex; it is black with 

 extensive orange markings; second segment with two circular orange 

 spots behind the middle, third and fourth segments each with a pair 

 of anteriorly united, orange spots or a broad band against the front 

 margin, strongly incised in the middle of its hind margin; the band 

 on third segment largest, reaching near to the hind margin, that on 

 fourth segment reaching beyond the middle, Abdomen clothed with 

 short hairs, longer at the side margin towards the base; the hairs 

 mainly follow the ground colour, but the hairs at the side margin are 

 yellow or only black on the hind part of third and fourth segments. 

 Venter yellow, the first segment, a prolongation on the middle of the 

 second and the apex dark; the hairs long, yellow. Legs brownish 

 yellow, anterior femora blackish on the basal part or half, hind femora 

 quite brownish black; anterior tibiæ with a somewhat indistinct dark 

 ring near the apex ; hind tibiæ quite darkened or a little paler at the 

 base; tarsi blackish; all tarsi with the last three joints a little broad 

 and flat. Femora haired as usual, the hairs somewhat long, yellow; 

 tibiæ short-haired, the hairs dark, hind tibiæ a little fringed on the 

 antero-dorsal side. Wings yellowish tinged. Squamulæ whitish yellow, 

 with a dark yellow margin and fringe. Halteres with the peduncle 

 yellow, the knob brownish. 



Female. Frons not broad, but widening from the vertex down- 

 wards; it is bluish black, shining, with a large dust band on the 

 middle; the hairs blackish. Thorax haired as in the male, but the 

 erect hairs shorter. Abdomen with the markings often paler, more 

 yellow, and they are more restricted, those on second segment small, 

 sometimes almost or quite disappearing, and on third and fourth 

 segments the markings are a pair of transversely quadrate spots at 

 the front margins, well separated in the middle; the fifth segment is 

 generally obscurely reddish at the front corners. Tarsi a little flattened 

 as in the male. Wings not or almost not tinged. 



