156 



Tachinidae. 



2. O. aculeata Pand. 



1896. Pand. Rev. Entom. XV, 210, 4 {CalUpJwra). — 1902. Villen. Wien. 

 Ent. Zeitg. XXI, 26, Fig. 3 et 5, et 1907. Ann. Soc. Ent. de Fr. LXXVI, 397. 

 — 1907. Kat. palåarkt. Dipt. III, 549. — 1911. Kram. Abhandl. Nat. Geseli. 

 Gorlitz, 27, 44, Tab. III, Fig. 17. — 1924. Stein, Arch. f. Naturgesch. 90, 6, 

 265, 1. 



Male. Frons narrow above but orbits not touching; it is some- 

 what protruding and cheeks broad. Orbits and cheeks silvery shifting 

 to dark, jowls grey. Frontal stripe black. Orbits and cheeks with 

 fine hairs, jowls black-haired. Occiput grey pruinose with all black 

 hairs. Antennæ black, third joint at most one and a half times as 

 long as second; arista moderately long-plumose. 

 Palpi yellow or brownish. Thorax bluish black, 

 somewhat dull, slightly whitish pruinose in front, 

 stripes only indicated. Thorax black-haired; two 

 postsiitiiral and one præsutural intraalar bristle. 

 Abdomen bliie or greenish, shining, slightly whitish 

 pruinose; it is black-haired, third and fourth seg- 

 ment with marginal bristles, finest on third, and 

 some hairs on the middle of the disc may be bristly; 

 fifth segment covered with somewhat fine bristles. 

 Genitalia somewhat large; upper forceps straight, 

 cleft to middle into two thin close-lying branches; 

 arms of lower forceps of a similar shape, a little 

 thicker, generally diverging. Legs black; claws and 

 pulvilli elongate. Wings brown tinged, most along 

 veins and at anterior margin and base; veins black; first posterior 

 cell more or less narrowly open, sometimes nearly closed; discai 

 angle rectangular or somewhat obtuse; apical cross-vein straight 

 or nearly. Squamulæ brownish, the lower hairy on basal part. Hal- 

 teres brownish. 



Female. Similar; frons broad, broader than the eye. Stripes 

 on thorax a little more distinct. Squamulæ yellowish. 

 Length 5,5 — 8,5 mm. 



O. aculeata is not just common in Denmark; Ordrup Mose, Char- 

 lottenlund, Ermelund, Geel Skov; on Langeland at Lohals and in Jut- 

 land at Sønderborg; the dates are ^/^ — ^^/g. I have bred a specimen from 

 a pupa found under the bark of an elm on ^^/^g, it emerged on ^^Vs- 

 Geographical distribution: — Europe, at all events down into 

 France; hitherto not known north of Denmark. 



Fig. 32. O. acu- 

 leata, forceps in 

 profile. 



