154 Tachinidae. 



decaying animal matter. After Keilin (Parasitology XI, 1919, 432) 

 one of the species of Onesia s. str. seems to be parasitic on earthworms. 



0. {Melinda) caerulea (cognata) is parasitic on snails {H elicelia virgata, 

 Patula rotundata) and so probably also gentilis (Keilin 1. c. and 

 Schmitz: Biol. Zentralbl. 37, 1917, 24). 



Of the genus about 14 European species are known, 6 occur in 

 Denmark. 



Table of Species. 



1 . Lower squamula with hairs on upper surface ; cheeks broad ; 

 three sternopleural bristles; claws and pulvilli in male 



ratlier elongated (Onesia s. str.) 2. 



— Lower squamula bare or almost so; cbeeks somewhat 

 narrow; lower sternopleural bristle weak or wanting; 

 claws and pulvilli in male only a little elongated {Melinda 



R.D.) 4. 



2. Three postsutural intraalar bristles but no præsutural; 



occiput with reddish hairs below 1 . sepulchralis. 



— Only two postsutural intraalar bristles, and a præsutural; 

 occiput all black-haired 3. 



3. Arms of lower forcej^s thin and straight; front tibiæ with 



one posterior bristle 2. aculeata. 



— Arms of lower forceps broad and curved with a dilatation 

 ventrally at base and furrowed on outer side; front tibiæ 



with one or two posterior bristles 3. hiseta. 



4. Three postsutural intraalar bristles 5. 



— Only two postsutural intraalar bristles and a præsutural. . 6. polita. 



5. A præsutural intraalar bristle present; palpi yellowish to 

 blackish 4. gentilis. 



- — No præsutural intraalar bristle; palpi black 5. caerulea. 



1. O. sepulchralis Meig. 



1826. Meig. Syst. Beschr. V, 71, 34 et 1830. VI, 374 (Miisca). — 1862. 

 Schin. F. A. I, 376. — 1907. Kat. palåarkt. Dipt. III, 552, p. p. — 1917. Kram. 

 Abhandl. Nat. Gesell. Gorlitz, 28, 295. — 1924. Stein, Arch. f. Naturgesch. 

 90, 6, 266, 6. — Musca vespillo 1816. Fall. (nec Fabr.) Vet. Akad. Handl. 247, 

 23 et 1822. Dipt. Suec. Muse. 45, 25. — 1838. Zett. Ins. Lapp. 658, 20 et 1845. 

 Dipt. Scand. IV, 1307, 28 {Sarcophaga) . — O. suhapennina Rond. 1862. Dipt. 

 Ital. Prodr. V, 182, 3. — 1911. Kram. 1. c. 27, 44, Tab. III, Fig. 16. — Calli- 

 phora rectrocurva Pand. 1896. Rev. Entom. XV, 211, 5. — 1902. Villen. Wien. 

 Ent. Zeitg. XXI, 26, Fig. 1 (Onesia) et 1907. Ann. Soc. Ent. de Fr. LXXVI, 397. 



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

 rather protruding and cheeks broad. Orbits and cheeks silvery or 

 a little yellowish, jowls more grey. Frontal stripe black. Orbits and 



