ART. 17. NORTH AMERICAN PHOROCERA ALDRICH AND WEBBER. 27 



Exorista Mrsuta Osten Sacken, Canad. Ent., vol. 19, 1887, p. 163.— 



WiLLisTON, in Scudder's Butterflies of New England, vol. 3, 1889, p. 1919, 



pi. 89, figs. 13-15.— Town SEND, Psyche, vol. 6, 1893, p. 467. 



Blepharidea vjilgaris Uondani, Dipt. Ital. Prodromus, vol. 1, 1856, p. 67.— 



Brauer and Bekgenstamm, Zweifl. Kais. Mus. Wien, pt. 4, 1889, p. 88, 



pi. 2, fig. 18 ; pt. 5, 1891, p. 338 ; pt. 6, 1893, pp. 114, 117. 



Front in both sexes wider than one eye ; sciitelhim at least at tip 



yellow; palpi black; mid tibiae with two bristles on the front side 



near the middle. ^ . , ^ i 



Front of male 0.40 to 0.41 (three specimens) and in the temale 

 the same (three specimens) of the head width; front and face silvery, 

 the vertex blackish; bucca one-fourth the eye height; facial ridges 

 with delicate bristles on the lowest third usually, sometimes reaching 

 halfway ; frontal bristles strong, descending on sides of face nearly 

 halfway to the vibrissae; antennae five-sixths the length of face, 

 the third joint in male four and in the female two and one-fourth to 

 three times the second; arista strongly thickened to the middle; the 

 penultimate joint decidedly elongate in most males, hardly at all in 

 most females and a few males. Thorax black, gray pollinose, bearing 

 usually four dorsocentral macrochaetae, sometimes three ; scutellum 

 black at base the broad apex usually and the tip always yellowish 

 bearing three long pairs and a shorter upturned pair of apical 

 bristles. Sternopleura with three bristles. Abdomen black, sub- 

 shining, the bases of last three segments gray pollinose, sometimes 

 the fourth segment wholly shining black. Discal macrochaetae 

 present on the intermediate segments, the fourth with three or four 

 rows Mid tibiae alwavs with two and sometimes three, bristles on the 

 outside near the middle; hind tibiae subciliate, the bristles of uneven 

 leno-th Third vein with two or three bristles at base. Hypopygium 

 black, both pairs of forceps short and about the same length, the 

 inner ones fused together on their basal two-thirds and each tapering 

 to a fine point, outer forceps thick, each nearly equal to the width ot 

 the inner pair and ending in a blunt point; base of outer forceps 

 yellowish; inner forceps densely hairy on the outer sides. 



Length T to 9 mm. 



Redescribed from a very long series of North American specimens 

 and a few from Europe, the latter detennined by Professor Bezzi. 

 Brunetti. and Brauer and Bergenstamm. The North American ma- 

 terial is mostly from New England, but there are also specimens from 

 New York, Idaho, Washington, and British Columbia. The rype 

 of hh'suta is in the Museum of Comparative Zoology, Cambridge 

 Mass., and has been examined by the junior author. It was bred 

 from Pieris rapoe Linnaeus by Lintner, presumably m New York. 

 Coquillett had already made out the synonymy from the descrip- 

 tion. Townsend reported hirsuta reared from Pyramta penUahs 

 Grote by Forbes in Illinois. Tothill mentioned Torfr^^^ [Harmo- 



