426 U. S. NATIONAL MUSEUM BULLETIN 216 



ovipositor. There is a northern and a more southern subspecies, 

 distinguishable in the female on wing color. Differentiating charac- 

 ters have not yet been found for the males. 



Although the two subspecies are rather easily distinguished in the 

 female, a number of intermediate females have been seen from localities 

 where the ranges border or overlap. The localities of these are as fol- 

 lows: Connecticut (South Windsor); Massachusetts (Milton and 

 Northampton); Michigan (Midland Co.); New York (Ithaca, Roslyn, 

 and Taughannock Falls); Ontario (Ancaster and Leamington); and 

 Pennsylvania (Spring Brook). 



A key distinguishing females of the two subspecies is below: 



1. Wings of female hyaline or subhyaline; range: Canadian zone of eastern 

 North America and cooler parts of Alleghanian fauna. 



3a. atrata lineal a Porter 



Wings of female blackish; range: Alleghanian, Carolinian, and Austroriparian 



faunas 3b. atrata atrata (Fabricius) 



3a. Megarhyssa atrata lineata Porter 



Megarhyssa atrata lineata Porter, 1957, Ent. News, vol. 68, p. 206; ?. 

 Types: 29, Franconia, N. H. (New York). 



Male: Indistinguishable from male of M. atrata atrata. 



Female: Yellow markings on thorax, as described under the species, 

 more frequent and more extensive than in the subspecies M. atrata 

 atrata; wings varying from hyaline with a faint infuscation on apex of 

 front wing, to weakly infuscate. 



Specimens (859): From Maine (Bar Harbor); Michigan (Cheboy- 

 gan Co., Floodwood in Dickinson Co., and Owosso); New Brunswick 

 (Fredericton) ; New Hampshire (Franconia) ; Nova Scotia (South Mil- 

 ford and Wolfville); New York (Allegany State Park, Bemus Point, 

 Heart Lake in Essex Co., Ithaca, Labrador Lake in Cortland Co., 

 McLean Bogs Keserve in Tompkins Co., New York City, Nineveh, 

 Onteora Mt. in Greene Co., Spencer, Taughannock Falls, and West 

 Farms in New York City); Ontario (Arnprior, Britannia, Harold, 

 Marmora, Merivale, Niagara Glen, and Ottawa); Pennsylvania 

 (Corry); Quebec (Chambly, Covey Hill, Hemmingford, Knowlton, 

 and Lac McGregor); Vermont (Jacksonville and Laurel Lake near 

 Jacksonville); and Wisconsin (Baileys Harbor). 



There are a number of males taken with these females, or in the 

 same general area. Although most of them could be assigned to the 

 subspecies lineata on the basis of locality alone, they cannot be dis- 

 tinguished from males of the subspecies atrata, so are not listed. 



Collection dates are from late spring to late summer, the earliest 

 and latest dates being: May 27 and 28 at Ithaca, N. Y. ; May 29 at 

 Taughannock Falls, N. Y.; June 5 at Ottawa, Ont.; August 1 at Flood- 



