406 Tachinidae. 



joint with front margin concave; arista thickened in about basal 

 half. Palpi greyish black, more or less yellow on outer half, or quite 

 black. Tliorax dark olive brown, not or slightly shining, greyish 

 priiinose just in front, and here with the beginning of four dark 

 stripes, two narrow median and two broader lateral. Thorax black- 

 haired. Abdomen olive or a little æneous, somewhat shining, with 

 greyish shifting tessellations; it is black-haired, the hairs rather 

 long; second segment withoiit bristles, third and fourth with discai 

 and marginal bristles, the discai on third segment more than one pair, 

 also on fourth sometimes two pairs; the marginal a pair on third and 

 a row on fourth segment; fifth segment quite covered with bristles; 

 the bristles long. Fifth sternite cleft about to middle, the inner corners 

 of the lamellæ drawn out into a point. Genitalia not large; præhypo- 

 pygial segment shining, with bristles behind; hypopygium with 

 long, bristly, upwards curved hairs; upper forceps lancet-shaped, 

 bare and shining, only haired just at base, with parallel margins, 

 rounded at apex; it is flat above, but below excised in the middle and 

 thus with a thickening before apex; arms of lower forceps not broad, 

 attenuating outwards, obtuse at end, with a polished knob at base, 

 and curved a little inwards. Legs black, somewhat densely bristled 

 and haired. Wings more or less brownish tinged, especially anteriorly; 

 veins strong, blackish brown, medial cross-vein often clouded, also 

 the other veins with an indication of a seaming; discai angle rectangu- 

 lar, apical cross-vein bent outwards a little above the angle; posterior 

 cross-vein straight. Squamulæ whitish. H alteres brownish yellow. 



Female. Similar, but more grey or brownish pruinose on thorax, 

 and thus the dark lines stretching more backwards. Frons as broad 

 as the eye, only sHghtly protruding; orbits broad, frontal stripe 

 narrow. 



Length 5 to about 7 mm. 



L. duhia is somewhat common in Denmark; at Copenhagen in 

 a garden, Ordrup Mose, Ermelund, Dyrehaven, Geel Skov, Ruder- 

 hegn, Hillerød, Grib Skov, Tokkekøb, Tisvilde, Jægerspris, Nyraad 

 at Vordingborg; on Lolland at Christianssæde, Knuthenborg and 

 Maribo, and in Jutland at Sønderborg, Augustenborg, and Madeskov; 

 the dates are ^'^U—^ly, it is thus especially a spring species. It is known 

 as parasite on Melasoma populi and on the larva of Cyaniris argiolus, 

 but has not been bred with us. 



Geographical distribution: — Europe down to southern France; 

 towards the north to northern Scandinavia. 



