ZENILLIA AND ALLIED GENERA — SELLERS 9 



Exorista Hbatrix (Panzer) Meigen, Systematische Beschreibung der europaischen 



zweitliigeligen Insecten, vol. 7, pp. 46, 256, 1S3S. — Stein, Arch. Naturg., Abt. 

 A, Heft 6, pp. 77-78, 1924. — Babanoff, Institut fiir Hygiene und Schule fiir 

 Volksgesundheit, Zagreb, Arb. parasit. Abt., No. 3, p. 8, 1931. 

 Myxcxorista Hbatrix (Panzer) Braueb and Beegenstamm, Denksclir. Akad. Wiss. 

 Wien, math.-nat. Kl., vol. 58, p. 333, 1801. 



Head with front of male at narrowest 0.25 to 0.27 (in three speci- 

 mens) and in female 0.29 to 0.31 (in three specimens) of head width; 

 frontal row of seven to eight bristles in male and five to seven in female, 

 extending from on a level with base of third antennal segment to two 

 reclinate pre verticals; male with very weak and female with outer 

 vertical bristle; gena one-fifth to one-fourth eye height, silver gray; 

 frontal orbit golden, face silver, and posterior orbit golden on upper 

 portions and silver on lower portions ; antenna black, third segment in 

 male more than three times and in female two and three-fourths times 

 second; arista thickened on basal two-fifths, penultimate segment at 

 least as long as broad ; palpus yellow, inf uscated at base. 



Thorax heavy golden-pollinose on dorsal portions, sides more gray- 

 ish ; four mesonotal vittae ; four postsutural dorsocentral macrochae- 

 tae; scutellum heavy golden-pollinose with three pairs of marginal 

 scutellars and one decussate apical pair turned backward, one pair of 

 discal scutellars; three sternopleural macrochaetae ; legs black, a little 

 grayish pruinose; front tibia with two median posterolateral bristles; 

 midtibia with one inner ventral bristle; hind tibia not ciliate; wing- 

 tinged with yellow at base and anterior margin ; third vein with two or 

 three bristles at base ; squamula yellow. 



Abdomen completely covered dorsally with heavy golden pollen 

 gradually becoming gray on venter, especially on intermediate seg- 

 ments ; dorsal vitta lacking in some lights, obscurely marked in others ; 

 first and second segments with a pair and third segment with a row 

 of marginal macrochaetae; second and third segments with a pair of 

 discal macrochaetae often more or less roughly arranged, often with 

 additional bristles and macrochaetae in discal area; fourth segment 

 more or less irregularly covered with bristles, in some specimens discal 

 bristles a little larger and roughly arranged in a row. 

 Length 6.5 to 8 mm. 



Distribution. — The species is widely distributed throughout Europe 

 from England in the west to Russia in the east and from Spain in the 

 south to Finland in the north. 



Hosts. — Porthetria dispar (Linnaeus) , Stilpnotia salicis (Linnaeus) , 

 Nygmia phaeorrhoea (Donovan), Calocasia coryli (Linnaeus), Thau- 

 metopoea processioned (Linnaeus), Oxycestd geographic® (Fabricius), 

 and Pygaera pigra (Hufnagel). Specimens examined from these 

 hosts were reared at the Central European station formerly maintained 

 at Budapest, Hungary, by the Division of Forest Insect Investiga- 



