ICHNEUMON-FLIES OF AMERICA: 1. METOPIINAE 7 



6. Upper edge of pronotum paralleled by a broad, shallow, submarginal groove 



(fig. 165,a); sublateral longitudinal carina of abdomen extending at most to 

 basal third of second tergite, entirely absent from third tergite (fig. 165,a) ; 



mesopleural suture present. Worldwide 3. Chorinaeus (p. 12) 



Upper edge of pronotum without a distinct submarginal groove (fig. 165,b) ; 

 sublateral longitudinal carina of abdomen extending the entire length of 

 second tergite (except in Trieces teres), present also on third tergite, at least 

 basally (except in Trieces teres) (fig. 165,b); mesopleural suture absent. 

 Worldwide 4. Trieces (p. 34) 



7. Hind tibia with one apical spur; flagellum enlarged beyond the middle 



(weakly clavate, fig. 172). Holarctic 10. Periope (p. 136) 



Hind tibia with two apical spurs; flagellum not enlarged beyond the middle . 8 



8. Antennal sockets separated by a high lamella, the lamella with a deep median 



groove dorsally (just below median ocellus) 9 



Antennal sockets not separated by a high lamella, or when a lamella is present 

 it does not have a median groove 11 



9. Propleurum somewhat cubical in shape, shaped about like the front coxa 



(fig. 170,b); head in profile concave between hind ocellus and occipital 



carina. Neotropic 9. Cubus (p. 135) 



Propleurum not cubical, weakly convex (figs. 170,a; 171, a); head in profile 

 flat or convex between hind ocellus and occipital carina 10 



10. First abdominal segment broad basally, its spiracle near its basal 0.25, its 



sternite extending about 0.2 its length; propodeum with distinct dorsal 

 and posterodorsal faces (fig. 170,a); head somewhat cubical; edge of inter- 

 antennal lamella arcuate in profile. Worldwide . . 7. Triclistus (p. 107) 

 First abdominal segment narrow basally, its spiracle near its basal 0.37 to 0.5, 

 its sternite extending 0.3 to 0.5 its length; propodeum without distinct 

 dorsal and posterodorsal faces, these blending in an even curve (fig. 171, a); 

 head lenticular; edge of interantennal lamella angulate in profile. World- 

 wide 8. Colpotroehia (p. 127) 



11. Areolet present 12 



Areolet absent 15 



12. Occipital carina entirely absent; propodeal spiracle round. Holarctic and 



New Zealand. 



16. Carria (p. 154) 

 Occipital carina present; propodeal spiracle elongate 13 



13. Epipleurum of second abdominal segment large, conspicuous, at least 0.3 as 



wide as its tergite (fig. 179, a); spiracle of first tergite just above lateral 



carina. Nearctic and Indo-Australian 15. Seticornuta (p. 150) 



Epipleurum of second abdominal segment narrow, inconspicuous; spiracle 

 of first tergite just below lateral carina 14 



14. Metapleurum with hairs over its entire surface; notaulus absent; sixth tergite 



of female mostly retracted into fifth; front wing 9.0 to 11.5 mm. long. 



Holarctic 11. Spudaeus (p. 138) 



Metapleurum without hairs; notaulus short but distinct; sixth tergite of 

 female projecting distinctly beyond the fifth; front wing 5.0 to 6.7 mm. 

 long. New World 14. Leurus (p. 147) 



15. Second abdominal tergite with a median pair of longitudinal carinae, at 



least at its base (figs. 173, a and 176,b); second recurrent vein meeting 

 cubitus almost at the intercubitus, the second abcissa of cubitus being less 

 than 0.25 the length of intercubitus; metapleurum densely hairy all over; 



temple short 16 



451582—59 2 



