ART. 17. NORTH AMERICAN PHOROCERA ALDRICH AND AVEBBER. 33 



thickened on the basal fifth, the penultimate joint sliort. Thorax 

 black, thinly whitish pollinose, marked with four or five black vittae 

 and bearing four dorsocentral macrocliaetae; scutellum yellowish 

 with four pairs of marginal bristles of about the same length. 

 Sternopleura with two bristles. Abdomen black polished (some- 

 times the sides of the intermediate segments yelloAvish) thinly white 

 pollinose, the apical margins very narrowly shining black. Discal 

 macrochaetae present especially on the third segment, abdominal 

 hairs large and erect. Legs black except the tibiae, which are yel- 

 lowish ; mid tibiae bearing two bristles on the outer front side near 

 the middle; hind tibiae ciliate. Hypopygium black, someAvhat 

 brownish, inner forceps curved inwardly and tapering to a fine 

 point; outer forceps stouter, decidedly shorter and of a somewhat 

 reddish tinge. When viewed from behind the inner forceps ai-e dis- 

 tinctly separated 



Length 8 to 10 mm. 



Described from a long series of specimens of both sexes; most of 

 them fall into two series, of which the first is from New England, 

 and has been bred commonly from Estigmene aaraea Drury. The 

 second series was collected in New Mexico by Townsend in 1916, 

 at Indian Spring, and at Hell Canyon, Manzano National Forest. 

 Other specimens are from Tempe, Arizona (Wildermuth), Great 

 Falls, Virginia (Townsend), and from Hymers, Ontario, reared 

 from Phragmatohia assimilans, var. franconica Slosson (H. Daw- 

 son). 



Type.—M-alQ, Cat. No. 25697, U.S.N.M., from Hell Canyon, New 

 Mexico. 



ZENILLIA CURRIEI Coqnillett. 



Exorista curriel Coquillett, Revi.s, Tachin., 1897, p. 94. 



Three dorsocentrals ; discals present; orbital bristles present in 

 the male. 



Front of male 0.37 to 0.38 (three specimens) and in tho female 

 0.35 to 0.37 (two specimens) of the head width; silvery in most 

 specimens but often blackish at vertex, the sides sparsely haired; 

 front somewhat prominent; orbital bristles present in both sexes; 

 parafacials silvery pollinose, at their narrowest part about equal to 

 the width of the third antennal joint; bucca one-seventh the eye 

 height ; palpi yellow, the base often inf uscated ; facial ridges bristly 

 on lowest third, sometimes nearly half way. Antennae as long as 

 the face, the third joint in both sexes four and one-half times the 

 second, its apex slightly angulated and prominent above; arista 

 thickened on the basal fourth, the penultimate joint short. Thorax 

 gray pollinose, with three dorsocentral macrochaetae and marked 

 with four black vittae; scutellum black except the extreme tip 



