ZeniUia. 339 



in basal half. Palpi yellow. Thorax yellow pruinose, with four narrow 

 black stripes, tlie median abbreviated behind, the lateral interrupted 

 at the suture into two elongated spots; scutellum briglit yellow. 

 Thorax black-haired. Three sternopleural bristles. Abdomen quite 

 yellowish or brownish yellow pruinose, basal segment a little darker; 

 it is black-haired, with a pair of marginal bristles on second segment, 

 a pair of discai and marginal on third and a pair of discai and a row 

 of marginal on fourth segment. Legs black, a little greyish pruinose. 

 Wings yellow at base and anterior margin, outwards slightly tinged; 

 veins brown; first posterior cell narrowly open, ending near apex 

 of wing; discai angle obtuse; apical cross-vein about straight. Squa- 

 mulæ yellow or deep yellow. Halteres yellow. 



Female. Similar; frons a little broader, as broad as the eye. 



Length 6,5 — 8 mm. 



Z. libatrix is not common in Denmark; Geel Skov (Schlick) and 

 on Funen at Faaborg (C. S. Larsen); the latter specimens were bred 

 from a pupa of Acronycta auricoma, taken on ^^/g, the fly coming on 

 ^/g. The species is otherwise known from Pygaera pigra, Dasychira 

 pudibunda, Lymantria dispaj\ Porthesia similis, Euproctis chry- 

 sorrhoea, Malacosoma neustria, Brephos nothum, Bupalus piniarius, 

 Larentia autumnalis, Phlyctaenodes verticalis, Sylepta ruralis, Hypo- 

 nomeuta euonymella, pedella and cognatella and the non Danish Thau- 

 matopoea processionea, Pygaera anachoreta, Abrostola asclepiadis and 

 Hyponomeuta rorella. 



Geographical distribution: — Europe; towards the north to 

 Southern Sweden, and in Finland. 



Remarks: The species is known to vary in colour, being some- 

 times greyish, but our specimens are all brownish yellow. On account 

 of its varying it has been described under several names; to the above 

 synonymy still can be added: Tachina dolosa Meig., Exorista ancilla 

 Meig., Myxexorista macrops B. B,, M. grisella B. B. ZeniUia per- 

 plexa Pand., Z. discerpta Pand., Z. fulva Pand.; of these fauna Meig. 

 dolosa Meig., ancilla Meig. and grisella B. B. belong to the greyish 

 variety. 



2. Z. porcula (Zett. ?) Pand. 



(1859. Zett. Dipt. Scand. XIII, 6103, 106—7, {Tachina)'^.) 1896. Pand. 

 Rev. Entom. XV, 19, 26 (Exorista). — 1907. Villen. Ann. Soc. Ent. de Fr. 

 LXXVI, 386 (Exorista). — 1907. Kat. palåarkt. Dipt. III, 245 (Exorista). — 

 Myxexorista pexops B. B. 1891. Denkschr. Akad. Wiss. Wien, LVIII, 332. — 

 1907. Villen. Wien. Ent. Zeitg. XXVI, 250, 12. — 1921. Baer, Zeitschr. f. 



22* 



