AKT. 17. NORTH AMERICAN PHOROCERA ALDRICH AND WEBBER. 23 



mens identified in the Museum include rearing from Automeris io 

 Fabriciiis at Wallingford, Connecticut, by B. A. Porter. 

 Type. — In the University of Kansas. 



ZENILLIA COERULEA, new species. 



Front of male at vertex 0.27 of the head width (the same in two 

 specimens) ; the sides of front bearing a few inconspicuous hairs, 

 as wide as the vitta; frontal bristles reach the third antennal joint, 

 the two uppermost stout and reclinate; inner and outer vertical 

 bristles well developed ; face and front silvery ; facial ridges bristly 

 on the lowest fourth; bucca one-eighth the eye height, sparsely 

 haired excepting the stout bristles of the lower border ; palpi normal, 

 yellow, thickly clothed with fine black hairs; antennae five-sixths 

 the length of face, second joint elongate, the third hardly twice 

 the length of the second, arista slightly thickened on the basal tliird. 

 the penultimate joint short. Thorax black, subshining, thinly gray 

 pollinose marked with four black vittae; four dorsocentral macro- 

 chaetae; scutellum black, gray pollinose bearing three long pairs 

 of marginal bristles and a large cruciate apical pair; the disk is 

 covered with numerous, short erect hairs and bears a pair of widely 

 separated bristles smaller tlian the apical ones. Sternopleura with 

 three bristles. Abdomen black, gray pollinose, all of the first, nar- 

 row apical margins of the second and third and the tip of the fourth 

 segments shining black. No true discal macrochaetae, although the 

 abdominal hairs are rather long and erect, the first segment has one 

 pair, second segment with two or three pairs of stout marginal macro- 

 chaetae, the third with a marginal row and the fourth wholly cov- 

 ered. Legs black, mid tibiae with two or more bristles on the out- 

 side near the middle ; hind tibiae with bristles of uneven length and 

 not at all comblike. Wings hyaline; apical cell widely open, bend 

 of last section of fourth vein a little rounded, third vein with two 

 bristles at its base. 



Length 10 to 12 mm. 



Described from four female specimens reared at the Gypsy Moth 

 Laboratory from Cimhex americana Leach. Material collected July, 

 1919, at Auburn, Massachusetts, by William Eels, the Tachinids 

 issuing June 29 and July 12, 1920. 



Type.—C^i. No. 25704, U.S.N.M. 



ZENILLIA FORMOSA, new species. 



Front of male 0.23 to 0.26 and in the female 0.30 to 0.33 of the 

 head width; the sides gray pruinose, sparsely haired; frontal 

 bristles reach the base of the third antennal joint, the two up- 

 permost ones stout and reclinate, the penultimate one longest ; inner 

 verticar strong, the outer one vestigial in tlie male: face silvery 



