Myiobia. 533 



brown. Somewhat small ocellar bristles and inner vertical bristles. 

 Frontal bristles not reaching quite to end of second antennal joint, 

 all Crossing. Orbits bare and jowls with only a few small hairs. Occipiit 

 grey, with black hairs and pale hairs below, Antennæ yellow with 

 third joint black except base; arista thickened in basal part, short- 

 hairy. Palpi yellow or dark just at apex. Thorax greyish yellow 

 pruinose, with four very narrow blackish stripes, the median abbre- 

 viated behind, the lateral divided at the suture into two narrow, 

 elongated spots; scutellum with apex yellow. Thorax black-haired. 

 Abdomen yellow with fifth and most of fourth segment grey, pro- 

 longed into a triangularly narrowing stripe going to the base; the grey 

 parts yellowish pruinose. Abdomen is black-haired, with marginal 

 bristles, a pair on second and third and a row of about six bristles 

 on fourth segment; fifth likewise with only a marginal row. Legs 

 yellow with tarsi dark to black; claws and pulvilli elongated. Wings 

 slightly yellowish; veins brown; apical cross-vein sloping. Squamulæ 

 yellowish. Halteres yellow. 



Female. I have not seen the female; according to the descriptions 

 it has a broad frons with two orbital bristles, and abdomen less yellow. 



Length 7 mm. 



M. inanis is very rare in Denmark, I know only two specimens, 

 both males, taken many years ago at Boserup (Stæger). The species 

 is known to have been bred from the larva of a Taeniocampa. 



Geographical distribution: — Europe; towards the north to 

 middle Sweden. 



2. M. tibialis v. Ros. 



1840. V. Ros. Wiirttemb. Corrbl. I, 58. — 1907. Kat. palåarkt. Dipt. III, 

 424. — 1824. Stein, Arch. f. Naturgesch. 90, 6, 168 (Solieria). — Pyrrhosia 

 diaphana Rond. 1861. Dipt. Ital. Prodr. IV, 66, 3. — 1894. Strobl, Mittheil. 

 Ver. Steierm. XXX, 36 {Microynyiohia). ^ 1907. Kat. palåarkt. Dipt. III, 

 420. — 1910 Villen. Feuille des jeun. Nat. 5, 41, 22. — 1921. Baer, Zeitscbr. 

 f. angew. Ent. VII, 376. ■ — Micromyiohia montana B. B. 1891. Denkschr. Akad. 

 Wiss. Wien, LVIII, 385. 



Male. Frons broad, broader than the eye, somewhat protruding; 

 cheeks somewhat broad and jowls one third of the height of the eye. 

 Head greyish silvery; frontal stripe narrow, brown. Inner and outer 

 vertical and two or three orbital bristles. Frontal bristles reaching 

 to or about to end of second antennal joint, the uppermost directed 

 outwards. Orbits nearly bare, and jowls with a few small hairs below. 



