No. 2317. FIVE TRIBES OF WHNEUMONINAE—ROHWER. 427 



Pennsylvania (Walton); Indiana; Sherbrook, Canada; Tryon, North 

 Carolina (Fiske). 



Host.— Tremex columha (Linnaeus) in hickory from rearings made 

 by W. S. Fisher, of Branch of Forest Insects, Bmeau of Entomology. 



MEGARHYSSA LUNATOR (Fabricius). 



Ichneumon Zunaior Fabricius, Spec. Insect., vol. 1, 1781, p. 430. 

 Megarhyssa greenei Yieheck, Proc. U. S. Nat. Mua., vol. 40, 1911, p. 191, male, not 

 female. 



The type of this well-known species seems to be lost, but inasmuch 

 as it is impossible to say definitely it is inadvisable to fix a neotype. 

 Discussion based on specimens from the localities mentioned below. 



Distrioution. — This species is common in the Eastern States and it 

 probably occuts as far west as the Rocky Mountains. Specimens from 

 the following localities are in the collection: New York; New Jersey; 

 Philadelphia, Cory, Harrisburg, Linglestown, Pennsylvania; Wash- 

 ington, District of Columbia; Falls Church, Virginia; Pendleton, 

 South Carolina; Jacksonville, New Philadelphia, Illinois; Wyandotte, 

 Michigan; Boulder, Colorado (A. J. Evans). 



Host. — Parasitic on the larvae of Tremex columha (Linnaeus) ac- 

 cording to Riley and many rearings by the Branch of Forest Insects, 

 Bm'eau of Entomology. 



MEGARHYSSA NORTONI (Cresson). 



Rhyssa nortoni Cresson, Proc. Ent. Soc. Phila., vol. 3, 1864, p. 317. 

 Thalessa quebecensis Provancher, Nat. Can., vol. 5, 1873, p. 447. 

 Thalessa superba (Schrank) Morley, Rev. Ichn. Brit. Mus., pt. 2, 1913, p. 16. 

 (North American specimens.) 



The type of nortoni is in the Academy of Natural Sciences, Phila- 

 delphia. The type of quebecensis is probably lost. Discussion 

 based on type of n{)rtoni and specimens from localities listed below. 



Morley considers this species to be a synonym of the European 

 superha (Schrank) but if the European specimens of swperha which 

 are in the United States National Museum are correctly determined 

 (and they agree with the descriptions) then the two can easily be 

 separated by the first sternite, as follows: 



Middle of posterior margin of the heavily chitinized basal part of the first sternite 

 in female much before and in male even with a line drawn tangent to the posterior 

 margin of the first tergal spiracle; mesonotiim of male black nortoni (Cresson). 



Middle of posterior margin of the heavily chitinized basal part of the first sternite 

 in female and male much beyond a line drawn tangent to the posterior margin of 

 the spiracle ; mesonotum of male largely pale superba (Schrank). 



Distribution. — Provancher records this from Canada. Specimens 

 in the United States Museum are from the following localities : El 

 Paso County, Colorado (A. B. Champlain) ; Kansas; Panguitch (H. E. 

 Burke), Scofield (C. S. D. Bliss), Utah; Easton (Koebele), Olympia 

 (C. V. Piper), Mount Rainier (C. V. Piper), Hoquiam (H. E. Burke), 



