41 PROCEEDINGS OF THE NATIONAL MUSEUM vol.93 



covered with erect hairs and bearing one pair of discal scutellars; 

 three sternopleural macrochaetae ; legs black; fore tibia "with two 

 median posterolateral bristles, midtibia bearing two or more median 

 anterolateral bristles, one strong median inner ventral bristle; hind 

 tibia evenly ciliate, with one longer median bristle; wing grayish 

 hyaline, third vein with one or two bristles at base; squamae white. 



Abdomen black covered with gray pollen except dorsum of first 

 segment, which is shining black, apex of fourth segment and apical 

 portions of segments 2 and 3 less pollinose and often blackish or sub- 

 shining; the usual shining-black dorsal vitta obscure except on basal 

 half of second segment; sides of second segment of males usually 

 slightly rufous; no discal macrochaetae; first and second segments 

 with a pair and third with a row of marginal macrochaetae; fourth 

 covered with erect bristles more or less irregularly placed, about one- 

 half size of macrochaetae on third segment; abdominal hairs of 

 female subdepressed, in male more erect. 



Length 9-12 mm. 



Type locality. — West Medford, Mass. 



Distribution. — Massachusetts 3, New York 4, New Jersey 3, Penn- 

 sylvania 1, District of Columbia 1, Virginia 1, Indiana 1, Missouri 1. 

 Additional published records not duplicated above: Connecticut 

 (Johnson), New York 4 (West), New Jersey (Weiss), Maryland 2 

 (Aldrich and Webber), New Mexico (Aldrich and Webber). 



Type.— Male, U.S.N.M. No. 25705. 



Hosts. — Automeris io (Fabricius) 21; Agrotis ypsilon (Rottem- 

 berg) 4; Graptolitha innominata (Smith) or disposita (Morrison) 1. 

 Published record not duplicated in the above material : Automeris 

 io (Fabricius) (Reinhard). Coquillett's record of rearing Exorista 

 ■ inh-yae from Acronicta hamamelis Guenee (Koebele) belongs here; 

 Townsend's description of the anal stigmata was drawn from a pu- 

 parium on the same pin with fly labeled "389 Lo, Aug. 8, 82." 



Remarks. — The foregoing description is based on male type and 

 male paratype, reared from Automeris io, West Medford, Mass. 

 (Riley; Coquillett records as Exorista eudryae) ; two male and two 

 female paratypes reared from Agrotis ypsilon, Missouri (Riley; Co- 

 quillett records as Exorista eudryae) ; one female paratype, Lafay- 

 ette, Ind. (Aldrich) ; one female paratype, Melrose, Mass., TD 395, 

 (Townsend) ; one male paratype, Lehigh Gap, Pa. (Greene) ; 22 

 reared specimens bearing Gypsy Moth Laboratory note numbers, all 

 but one reared from A. io; one male and two females collected by 

 Aldrich, Greene, and Walton. 



Adults, May to September ; number per host, one to eight ; genera- 

 tions, one ; hibernation, as larvae in host pupa, 



