ICHNEUMON-FLIES, PART 2 1 EPHIALTINAE 377 



in dead wood. Like other species with these hosts, they are sometimes 

 found on the windows of garages, etc., where firewood is stored. P. 

 americana, however, is parasitic on borers in pine cones. 



Keys to the Nearctic species of Poemenia 



MALES 



1. Areolet absent; hind ocellus separated from eye by about 0.9 its long diameter; 



propleurum entirely black; mesoscutum, mesopleururn, and metapleurum 

 ferruginous; tyloids usually on flagellar segments 8 to 11, linear. 



4. pacifica, new species 

 Areolet usually present; hind ocellus separated from eye by about 1.1 to 1.4 

 its long diameter; propleurum white ventrally; mesoscutum and meta- 

 pleurum, and nearly always the mesopleurum, black; tyloids on flagellar 

 segments 6 to 8, rather broadly elliptic 2 



2. First sternite about 0.55 as long as its tergite; white on hind corner of pronotum 



extending forward more than half the distance to notaulus; first tergite 



1.9 to 2.7 as long as wide 3. americana (Cresson) 



First sternite 0.65 to 0.75 as long as its tergite; white on hind corner of pronotum 

 restricted to its extreme apex; first tergite 2.8 to 3.5 as long as wide ... 3 



3. Scape about 50 percent white, the rest infuscate ... 1. thoracica (Cresson) 

 Scape about 65 percent white, the rest infuscate .... 2. albipes (Cresson) 



FEMALES 



1. Abdominal segments 2 to 5 with two pairs of short ventral scleromes; ovi- 



positor sheath about 0.55 as long as front wing . 3. americana (Cresson) 



Abdominal segments 2 to 5 with one pair of long ventral scleromes; ovipositor 



sheath 0.9 to 1.4 as long as front wing 2 



2. Areolet absent; lateral ocellus separated from eye by about 1.0 its diameter; 



flagellum with 27 to 30 segments; mesoscutum always mostly ferruginous. 



4. pacifica, new species 

 Areolet present; lateral ocellus separated from eye by about 1.0 to 1.3 its diam- 

 eter; flagellum with 27 to 36 segments; mesoscutum black to ferruginous, 

 usually black 3 



3. Scape brownish in front; first sternite about 0.55 as long as its tergite; ovi- 



positor sheath about 1.3 as long as front wing ... 1. thoracica (Cresson) 



Scape white in front; first sternite about 0.66 as long as its tergite; ovipositor 



sheath about 1.05 as long as front wing 2. albipes (Cresson 1 ! 



1. Poemenia thoracica (Cresson) 



Ephialtss thoracicus Cresson, 1878, Proc. Acad. Nat. Sci. Philadelphia, vol. 1878, 



p. 377; 9- Type: 9, Vancouver Island, B. C. (Philadelphia). 

 Euxorides Vancouveriensis Provancher, 1883, Additions et corrections au volume n 



de la faune entomologique du Canada traitent des hymenopteres, p. 369; 9 . 



New synonymy. Type: 9 , Vancouver Island, B. C. (Quebec). 

 Ephialtes vancouverensis Harrington, 1894, Canadian Ent., vol. 26, p. 249; 9 . 



Type: 9 , Victoria, B. C. (Ottawa). 



Male: Front wing 4.6 to 6.7 mm. long; punctation of head and body 

 fine; hind ocellus separated from eye by about 1.1 its long diameter; 

 flagellum with 27 to 31 segments, with rather broadly elliptic tyloids 



526527—60 25 



