ICHNEUMON-FLIES, PART 2! EPHIALTINAE 303 



growth of forests at 0.5 to 2 meters above the ground, but it might 

 be that E. Ontario, which we have seldom seen in life, flies higher. 

 There are five Nearctic species. 



Key to the Nearctic species of Ephialtes 



(The female of E. componotus is unknown; it will probably trace to pacificus.) 



1. First tergite in side view convex above, but not pyramidally elevated near 



the middle; hind tarsal claws of female without a tooth. 



5. Ontario (Cresson) 



First tergite in side view pyramidally elevated near the middle; hind tarsal 



claws of female with a large internal tooth 2 



2. Males 3 



Females 6 



3. Mesoscutum entirely black 4 



Mesoscutum with a white mark at front end of notaulus 5 



4. Basal two segments of hind tarsus black, or brown with their apices black; 



face yellowish white, usually with a central black stripe and a black triangle 



under each antennal socket 1. picticornis (Cresson) 



Basal two segments of hind tarsus white, their apices blackish; face entirely 

 white 2. annulieornis (Cresson) 



5. Mesosternum and propleurum entirely black .... 3. pacificus (Cushman) 

 Mesosternum and propleurum white 4. coniponotus (Davis) 



6. Mesoscutum with a white mark at front end of notaulus. 



3. pacificus (Cushman) 

 Mesoscutum entirely black 7 



7. Tegula mostly brown or blackish; basal two segments of hind tarsus brown 



with their apices darker (fig. 326, e); hind tibia with a yellowish white band 

 that covers less than a third of its length. ... 1. picticornis (Cresson) 

 Tegula white; basal two segments of hind tarsus white with their apices blackish 

 (fig. 326, f); hind tibia with a white band that covers a little less than half 

 its length 2. annulieornis (Cresson) 



1. Ephialtes picticornis (Cresson) 



Figure 326,e 



Pimpla picticornis Cresson, 1870, Trans. Amer. Ent. Soc, vol. 3, p. 146; cf* 



Type: d\ New Jersey (Philadelphia). 

 Apechthis ornatulus Walley, 1929, Canadian Ent., vol 61, p. 190; &. Type: cf, 



Aweme, Man. (Ottawa). 



Front wing 7.3 to 13 mm. long; all tarsal claws of female with a 

 prominent basal tooth; first tergite subpyrami dally elevated just be- 

 hind the middle. The abdomen is very slightly less coarsely and dis- 

 tinctly punctate than in E. annulieornis. 



Male: Similar in coloration to female except as follows: Face except 

 usually for a central stripe and a triangle below each antennal socket, 

 small spot at top of eye, clypeus, front of scape and pedicel, spot on 

 mandible, palpi, tegula, usually hind corner of pronotum, usually 

 subtegular ridge, and rarely a discal pair of dashes on mesoscutum, 



