ZENILLIA AND ALLIED GENERA — SELLERS 103 



The larger puparium of Sisyropa alypiae can be easily distinguished 

 from the smaller S. eudryae. The crescent-shaped elevation above 

 the spiracles is not present in S. eudryae. The stigmal plates are not 

 so highly raised in alypiae; the spiracular entrances are longer and 

 more convoluted; the button is centrally located, whereas in eudryae 

 the button is located more on the inner side of the plate. The spiracles 

 are located about on the longitudinal axis in alypiae, whereas in 

 eudryae they are located on the upper side of the axis. The spiracles 

 in alypiae are separated by about the width of one stigmal plate; in 

 eudryae the separation width is about twice the width of one stigmal 

 plate. The anal opening of alypiae is smaller than that of eudryae. 



Type and allotype locality. — Somerville, Mass. 



Distribution, — Vermont 1, Massachusetts 12, Montana 1, British 

 Columbia 1. Published record: Missouri (Coquillett). 



Type.— Male, U.S.N.M. No. 54149. 



Hosts. — Alypia octomaculata (Fabricius) 35; Psych omarpha epi- 

 mensis (Drury) (no host adults were recovered from this collection) 

 1. All previous published records referring to the recovery of eudryae 

 from A. octomaculata can probably be considered to be alypiae. 



Remarks. — The material examined consisted of 36 reared specimens 

 bearing Gypsy Moth Laboratory note numbers (including the type and 

 allotype No. 10017 M2 ; two male and two female paratypes, Lexing- 

 ton, Mass., No. 10017; one male and one female paratype, Boston, 

 Mass., No. 10017 G2; one female paratype, Lynn, Mass., No. 10017 

 G3; one male paratype, Everett, Mass., No. 10017 L2a; one male and 

 one female paratype, Revere, Mass., No. 10017 L3 and L3a; two male 

 paratypes, Somerville, Mass., No. 10017 M2, M5; two female para- 

 types, Somerville, Mass., No. 10017 PI) ; one male, Kaslo, British 

 Columbia, labeled "compared with type of E. eudryae Towns, by 

 Lawson" (Currie). (This specimen was discussed by Aldrich and 

 Webber under Zenillia eudryae; it is alypiae) ; one male, Summit 

 Station, Mont, (Aldrich). One female from Revere, Mass., Gypsy 

 Moth Laboratory No. 10017 L3, has bare eyes (front 0.31). 



Adults, May to July; number per host, one to three; generations, 

 one; hibernation, in puparium. 



G. Genus THELYMYIA Brauer and Bergenstamm 



Thelymyia Brauer and Bergenstamm, Denkschr. Akad. Wiss. Wien, math.- 

 nat. EX, vol. 58, p. 331, 1891.— Town send, Manual of inyiology, pt. 4, p. 224, 

 1936. [Genotype, T. loewii Brauer and Bergenstamm. Monotypic. (T. 

 loweu)=Tachina saltuum Meigen, 1S24, Systematische Beschreibung der 

 europaischen zweifliigeligen Insecten, vol. 4, pp. 155, 329, 1824.] 



Exorista of Coquillett (nee Meigen) paitim, U. S. Dept. Agr., Div. Ent., Tech. 

 Bull. 7, p. 94, 1897. 



Zenillia of Aldrich and Webber (nee Robineau-Desvoidy), partim, Proc. U. S. 

 Nat. Mus., vol. 63, art. 17, p. 33, 1924. 



