ICHNEUMON-FLIES, PART 2! EPHIALTINAE 401 



markings not specified for each species are in general like those of 

 R. persuasoria. 



This group includes the European Rhyssa amoena Gravenhorst 

 1829, the Japanese Rhyssa jozana Matsumura 1912, some unnamed 

 Palaearctic species, and the four Nearctic species described below. 



3. Rhyssa ponderosae, new species 



Figure 317,c 



Front wing of male 7.5 to 9.5 mm. long, of female 13 to 19 mm. 

 long; apical edge of male subgenital plate with a broad median notch. 



Face of male black, white next to eyes; temporal orbit white on its 

 lower 0.65 ±; flagellum without a white band; thorax entirely black 

 except for anteroventral and upper margins of pronotum, spot on sub- 

 tegular ridge, and postscutellum, which are white; front and middle 

 coxae blackish, the front coxa with a white spot on outer side, in male 

 sometimes mostly pale or whitish; middle coxa of male more or less 

 white on outer side; hind coxa entirely black; femora fulvous, the 

 hind femur of male sometimes weakly infuscate; abdominal white 

 markings reduced in size, the paramedial white spots on fourth and 

 fifth tergites of female about 1.5 as wide as long. 



Type: 9, on Pinus ponderosa, Bass Lake, Calif., 1937, G. R. Struble 

 (Washington, USNM 63719). 



Paratypes: 3 c?, on Pinus ponderosa, Bass Lake, Calif., 1937, 

 G. R. Struble (Washington and Townes). d\ parasite of Sirex 

 areolatus, Berkeley, Calif. (Berkeley). 9, Berkele3 T , Calif., Apr. 14, 

 1926 (Berkeley). 49, Berkeley, Calif., Apr. 16, 1926 (Berkeley and 

 Townes). 9, Lake Tahoe, Calif., June 21, 1915, Bilsing Coll. (Berk- 

 eley). 9, Oakland, Calif., Apr. 23, 1950, B. Adelson (Townes). 9, 

 Yosemite, Calif., at 3,800 to 4,000 ft., May 22, 1921, E. O. Essig 

 (Townes). 



This species is known only from central California. 



4. Rhyssa alaskensis Ashmead 



Figure 317,d 



Rhyssa alaskensis Ashmead, 1902, Proc. "Washington Acad. Sci., vol. 4, p. 199; 9 . 



Type: 9 , Fox Point, Alaska (Washington). 

 Rhyssa skinneri Viereck, 1903, Trans. Amer. Ent. Soc, vol. 29, p. 86; 9 • Type: 

 9 , Beulah, N. Mex. (Philadelphia). 



Front wing of male 6.5 to 15 mm. long, of female 9 to 22 mm. long; 

 apical edge of male subgenital plate straight. 



Face of male entirely white; temple black or blackish brown, some- 

 times largely pale brown and occasionally with an ill-defined whitish 

 splotch; flagellum without a white band; metapleurum often with a 

 white spot in male, usually with a white spot in female, the spot pro- 



