ART. 17. NORTH AMERICAN PHOROCERA ALDRICH AND WEBBER. 35 



v/ith three bristles. Abdomen with discal and marginal macro- 

 chaetae, the abdominal hairs long and erect, fourth segment thickly 

 clothed all over with long bristles. When viewed in certain lights 

 the sides and bases of the last three segments reflect gray pollinose. 

 Mid tibiae with three or more strong bristles on the outer side near 

 the middle; hind tibiae with many irregularly placed bristles of 

 uneven length. Hypopygium black, the inner forceps somewhat 

 longer than the outer ones, straight, hairy on the outside, and taper- 

 ing to a fine point, superficially examined they seemed fused to- 

 gether. 



Length 5 -to 9 mm. 



Redescribed from several European specimens, one determined by 

 Brauer and Bergenstamm as ParescorUta. polychaeta Macquart; also 

 from a larger series from New England (Webber), and other speci- 

 mens from Beaver Creek, Montana (Hunter) ; Marshall Pass and 

 Tennessee Pass, Colorado (Aldrich), altitudes 10,856 and 10,290 feet 

 respectively; Emigration Canyon, Utah, altitude 6,500 feet (Aid- 

 rich) , Oxford, Idaho (Aldrich) . Coquillett reports it from Toronto, 

 Canada, Tothill from Ottawa, Canada, and Washburn includes it 

 in his Minnesota list. It has been reared from Arctia, species (Co- 

 quillett), and from Phragmatohia fuUginosa Linneaus (Tothill). 

 Bezzi gives the extensive European bibliography and some Euro- 

 pean hosts in the Palearctic Catalogue (vol. 3, p. 239). 



ZENILLIA CONFINIS FalWn. 



Tachina confinis Fallen, Muscides, 1820, p. 32.— Meioen, Syst. Beschr., 

 vol. 4, 1824, p. 274. — Zetterstedt, Ins. Lapp., 1838, p. 644, and Dipt. 

 Scand., vol. 3, 1844, p. 1140. 



Exorista confinis Rondani, Dipt. Ital. Prod., vol. 3, 1859, p. 143. — Coquil- 

 lp:tt, Revis. Tachiu., 1897, p. 97.— Reinhard, Ent. News, vol. 32, 1921, 

 p. 72.— Greene, Proc. U. S. Nat. Mus., vol. 60, p. 11, fig. 21 (puparium). 



Tachina theclaruin Scudder, Canad. Ent., vol. 19, 1887, p. 166. 



Exorista theclarum Williston, in Scudder's Butterflies of New England, 

 vol. 3, p. 1920. 

 Exorista chrysophanl Townsend, Ent. News, vol. 2, 1891, p. 197. 



With four sternopleural bristles, penultimate joint of the arista 

 usually longer than broad; no discal bristles; abdomen from base of 

 third segment shining black; palpi black; mid tibiae with two 

 bristles. 



Front in male 0.25 to 0.26 (in three), in the female 0.30 to 0.36 (in 

 three) of the head width ; face and front silvery pollinose, the latter 

 somewhat blackish ; bucca one-sixth or less the eye height ; third joint 

 of antennae in the male five and in the female three times as long as 

 the second; penultimate joint of the arista longer than broad (in 

 some specimens not a good character) ; facial ridges bristly one-third 

 way up and sometimes halfway; palpi black. Thorax black, gray 



