ART. 17. NORTH AMERICAN PHOROCERA ALDRICH AND WEBBER. 29 



Caesar reports it an abundant parasite of Cdcoecia in Ontario ; in 

 Walton's unpublished index it is recorded from Cacoecia argyrospila 

 Walker at Wenatchee, Wash., reared by Newcomer. 



The type of nigripalpis is in the University of Kansas, where it 

 was examined by the senior author. 



Paratype (of cac.sar) .— Male, Cat. No. 25694, U.S.N.M. 



ZENILLIA CRASSISETA. new species. 



Front in both sexes golden pollinose; palpi black; scutellum yel- 

 lowish ; front in both sexes at vertex less than the eye width. 



Front of male 0.23 and 0.26 and in the female 0.30 the head width, 

 golden pollinose in both sexes, the vertex rarely blackish; frontal 

 vitta narrower than the paraf rontals ; frontal bristles reach below the 

 base of third antennal joint, the two uppermost reclinate in the male, 

 three in the female; paraf acials silvery; facial ridges bristly on the 

 lowest fourth; bucca one-seventh the eye height; third antennal 

 joint in the male hardly three times and in the female two and 

 one-fourth times the second, arista very slender, hardly at all 

 thickened on the basal fifth, the penultimate joint short (in one 

 specimen somewhat elongate). Thorax black, dusted lightly with 

 yellowish pollen and marked with four black vittae ; four dorsocen- 

 tral macrochaetae ; scutellum black at base, yellowish at the tip, 

 bearing three long pairs of marginal and a shorter upturned pair 

 of apical ones, the pair next the apicals very long, stout at base, 

 reaching to the third abdominal segment. Sternopleura with three 

 bristles. Abdomen black, the hind margins of segments two and 

 three, a median stripe on the second, and the apical half of the 

 fourth polished black. Discal macrochaetae present on the inter- 

 mediate segments, the fourth with two or three rows, those on the 

 apical half strongest; marginal bristles long and stout at base; ab- 

 dominal hairs erect in the male, depressed in female. Mid tibiae 

 with two bristles on the outer front side near middle; hind tibiae 

 unevenly ciliate. Last section of fourth vein arcuate on the basal 

 three-fourths; third vein with two bristles at its base. 



Length 7 to 8 mm. 



Described from four specimens, two of each sex collected at 

 Lafayette, Indiana, and North Andover, Massachusetts. 



Type.—Mii\Q. Cat. No. 25695, U.S.N.M., from Lafayette. Indiana. 



ZENILLIA TRISETOSA Coqnillett. 



Exoruta trisetosa Coquillett, Proc. U. S. Nat. Mus., vol. 25, 1902, p. 110. 



Distingushed from all others of this group by the presence of a 

 long costal spine. 



Front of male 0.34 (in two) and in the female 0.35 (in two) of 

 the head width; parafrontals black when viewed from in front, 



