ICHNEUMON-FLIES, PART 2'. EPHIALTINAE 47 



valve of ovipositor with basalmost 2 or 3 ridges strongly elevated and 

 distinctly curved; male front femur (male of subtilis unknown) slender 

 and without an excision beneath. 



One of the two included species has been reared on numerous occa- 

 sions from sawfly galls in leaves of Salix. 



The group contains the Nearctic subtilis, and the Holarctic poly- 

 t3 r pic vesicarius. 



4. Scambus (Scambus) subtilis Walley, new species 



Male: Unknown. 



Female: Front wing about 5.0 mm. long; antenna with 21 segments; 

 ocelli unusually small, greatest diameter of a lateral ocellus equal to 

 0.6 times distance from ocellus to eye; cheek rather long, about 0.5 

 times breadth of mandible at base; temple, as seen from above, 

 strongly rounded, and about 0.57 as long as eye; thorax and propodeum 

 moderately stout; propodeum rather evenly convex, with weak, dorso- 

 medial carinae extending from base to a little beyond middle; hind 

 femur 4.2 times as long as deep; abdomen with tergite 1 only slightly 

 elevated, and about as long as breadth at apex, its sides and central 

 area at apex with numerous, coarse, rather shallow punctures; re- 

 maining tergites with numerous, unusually large, rather unevenly 

 spaced, but generally well separated punctures; sternites, except pair 

 nearest base of abdomen, unusually small; ovipositor slender, rather 

 weakly compressed, sagittate at apex, its upper valve with a promi- 

 nent nodus, and with region beyond nodus somewhat flattened; lower 

 valve with basal 2 or 3 ridges rather strong and slightly arcuate; 

 sheath slightly longer than abdomen; hairs on sheath shorter and 

 finer than in most other species. 



Black. Antenna blackish, becoming dark brownish on apical 0.35 

 of flagellum beneath; basal segment of maxillary palpus and entire 

 labial palpus brownish black; remainder of maxillary palpus, small 

 spot in hind angle of pronotum, and tegula, pale yellowish; stigma 

 dark brown to blackish, marked with a sordid yellowish stripe that 

 occupies basal angle and extends for some distance outwardly along 

 costal margin; legs mostly reddish; front coxa and trochanter brownish 

 to blackish; hind tibia dark brownish above, shading to reddish brown 

 beneath, and marked above with a fairly distinct yellowish, longi- 

 tudinal stripe on middle, and a small, yellowish spot at base; middle 

 tibia with same pattern more faintly repeated; middle and hind tarsi 

 brownish, narrowly paler at bases. 



This species closely resembles vesicarius in the form of the ovipositor. 

 In subtilis, however, the upper valve is a little less distinctly flattened 

 beyond the nodus and the basal ridges of the lower valves are a little 

 less strongly elevated. Other features of special value for the recog- 



