NO. 1789. NEW ICHNEUMON-FLIES— VIERECE. 407 



of Hyphantria and a female reared from the chrysalis of Eudamus 

 (Epargyreus) tityrus, both from Enola, Pennsylvania, collected by 

 H. Kirk and A. B. Champlain, March 27, 1909. The male emerged 

 April 27, 1909, and the female May 5, 1909. 



The female resembles the male. It is, however, noteworthy that 

 in the female the sixth and twelfth joints of the flagel are either 

 entirely or mostly yellow, the nipples on the anterior edge of the 

 clypeus not so distmct, m fact quite rudimentary, and the areola 

 is emarginate posteriorly. The sheaths of the ovipositor are approxi- 

 mately as long as the first dorsal segment of the abdomen. 



Genus MESOCHORUS Gravenhorst. 



MESOCHORUS PERNICIOSUS, new species. 



Scutel typical in outline. 



Female. — Length 5 mm.; face separated from the malar space as 

 m the genotype, lower inner orbits not striate but punctured, the 

 inner orbits with a yellow band extending nearly to the top of the 

 eyes, malar space and most of mandibles yellow, clypeus yellowish, 

 with a few punctures, rest of face translucent brownish as are the 

 antennas except beyond the middle where they are fuscous, tips of 

 mandibles blackish, palpi oclireous, interocellar area and occiput 

 blackish; pronotum without a median longitudinal carina, brown- 

 ish, the posterior edge blackish and the tubercles yellowish, rest of 

 thorax brownish variegated with black or blackish patches, tegulse 

 and base of wmgs yellowish, stigma mostly blackish, yellow at base, 

 veins more or less brownish, transverse median vein almost intersti- 

 tial, areolet petiolate, otherwise the venation is nearly as in the 

 genotype, legs mostly brownish; median areas of propodeum sepa- 

 rated from each other by distinct carinas, basal area at least three 

 times as long as wide at apex and nearly parallel sided, nearly half 

 as long as the areola which is nearly as wide between the costulse as 

 from costulae to base, costulse joining the areola above the middle, 

 petiolarea about twice as wide as the areola and nearly as wide as 

 long, petiole nearly three times as long as at apex, gradually widened 

 toward apex where it is nearly three times as wide as at base, smooth 

 and polished, slightly depressed dowu the middle of the basal half of 

 the region beyond an imaginary line drawn between the spiracles, 

 first dorsal segment mostly blackish, second dorsal segment blackish 

 except for the thyridia which are translucent brownish and apical 

 margin which is more or less testaceous to yellowish, basal two- 

 thirds of third dorsal segment translucent brownish, the rest of this 

 segment and the remaining dorsal segments brownish stained with 

 black, ventral fold more or less yellow, sheaths of the ovipositor 

 not much longer than the hypopygium. 



