ART. 17. NORTH AMERICAN PHOROCERA — ALDRICH AND WEBBER. 15 

 ZENILLIA PROTUBERANS, new species. 



Front in male 0.256-0.245 of the head width ; face and front silvery 

 pruinose, the sides of the latter bearing a few inconspicuous hairs; 

 •facial ridges hairy on the lowest third or less; bucca one-twelfth 

 the eye height; palpi yellow; antennae shorter than face, the third 

 joint two and one-half times the second ; arista thickened on the basal 

 third, the penultimate joint short. Thorax black, grayish pollinose, 

 bearing four black vittae ; four dorsocentral macrochaetae ; scutellum 

 black at base, the apex yellowish and bearing three long and one 

 shorter apical pair of bristles. Sternopleura with two bristles. 

 Abdomen mostly yellow excepting a black vitta on the dorsum and a 

 similar one on the venter; no true discal macrochaetae present, al- 

 though the abdominal hairs are long and erect and almost attain the 

 size of macrochaetae. Legs brown, mid tibiae bearing one bristle 

 on the outer front side near the middle; hind tibiae short ciliate. 

 Wings normal, the third vein bearing two bristles at its base. The 

 puparium of this species has the anal stigmata protruding and is 

 in this respect similar to Zenillia cheloniae Eondani. 



Length 8 to 9 mm. 



Described from two male specimens reared at the gypsy moth 

 laboratory, from Malacosoma disstria Huebner. Material collected 

 at Kockingham, Vermont, June 21, 1915, by J. J. Culver, the flies 

 issuing Julv 23-25, 1915. 



Type.— Msile, Cat. No. 25699 U.S.N.M. 



ZENILUA HELVINA Coquillett. 



Exorista helvina Coqutllet, Revis. Tachin., 1897, p. 96.— Johnson, Cat. 

 Ins. New Jersey, 1899, p. 672 ; ed. 2, 1909, p. 780.— Slosson, Ent. News, 

 vol. 9, 1898, p. 252.— ToTHiLL, Canad. Ent., vol. 45, 1913, p. 71. 



Thorax and abdomen golden pollinose ; discal macrochaetae usually 

 confined to the third segment ; mid tibiae with two bristles. 



Front of .male 0.264-0.296 and in the female 0.320-0.340-0.333 

 of the head width; face and front usually yellowish pollinose, the 

 former sometimes silvery, face wider than front; bucca one-fifth 

 the eye height; palpi yellow, normal; facial ridges hairy on lowest 

 fourth; antennae nearly as long as face, the third joint m male four 

 and one-half and in the female three and one-half times the second; 

 arista gradually tapering from base to apex, penultimate jomt short. 

 Thorax black, yellowish pollinose marked with four black vittae and 

 bearing usuallv four dorsocentral macrochaetae, sometimes thi;ee: 

 sternopleura with three bristles; scutellum yellow pollinose bearing 

 four long pairs of marginal bristles, the apical being of the same 

 size as the other three; also a strong pair on disk. xVbdomen wholly 

 yellow pollinose, the apex of segments two, three and four sometimes 

 blackish, but there is no definite line of demarcation: discal macro- 

 5596 24 — Proc.N.M.vol.C3 29 



