Xylophagidae. 81 



Of tlie genus 6 species are known from the palæarctic region, one 

 of which iias hitherto been fouiid in Denmaric. 



1. X. maculata Meig. 



1804. Xylophagus, Meig. Kiass. zweifl. Ins. 1, 154, 2. — 1842. Xylo- 

 phagus, Zett.'Dipt. Scand. I, 129, 3. — 1862. Subula, Schin. F. A. I, 26. 

 — 1903. Kat. palaaikt. Dipt. II, 42. 



Male. Front witli short greyisli pubescence, a dark, transverse 

 band somewhat above the antennæ; palpi yellow, sometimes the basal 

 joint dark. Antennæ dark brown, yellow below on the inner side. Thorax 

 black, the humeral cailus yellow, the yellow colour stretching some- 

 what inwards on the disc; in the middle, just on the transverse furrow, 

 there is a yellow. transverse stripe, widely iiiterrupted in the middle. 

 widened on the sides, and here connected with the yellow side band, 

 and at the inner ends prolonged somewhat towards both ends, anteriorly 

 sometimes so much as to form a narrow line, connected with the 

 yellow anterior spot ; the postalar cailus yellow, this colour stretching 

 forwardly somewhat in on the disc: on the upper margin of the 

 pleura there is a yellow band, stretching from the humerus to the 

 wing-root, and here much widened so that it reaches far down on 

 the pleura. Scutellum yellow, only black at the base; metapleura 

 yellow. Thorax with short, yeliowish pubescence on the disc. Abdomen 

 black with broad, yellow side spots on the first segment, the following 



Fig. 29. Wing of -X. maculata. 



with yellow hind margins. Venter black with narrow, sometimes 

 indistinct, yellow hind margins of the segments, except the first. 

 Genitalia reddish yellow. Abdomen with short, dark pubescence, being 

 pale on the yellow margins. Legs yellow; coxæ and trochanteres 

 black; hind femora and tibiæ black at the tips; tarsi blackish or brown 

 towards the ends, hind tarsi only to a slight degree. Legs very short 

 liaired, only the hind femora on the inner side, at the base, with some 

 long hairs. Wings yeliowish, the veins brown; the first of the veins 

 rising from the discai cell curved. Halteres yellow. 



Female. Quite agreeiug with the male, only the hind femora 

 without long hairs at the base. 



Lenglh : There is also in this species some difference in size between 

 male and female; male: 8 — 9 mm., female: 8,5 — 10,.5 mm. 



6 



