ICHNEUMON-FLIES OF AMERICA: 1. METOPIINAE 175 



25. Point of interantennal process of face with a 45° angle; head flattened in 



front ; hind corner of pronotum yellow 53. silus, new species 



Point of interantennal process of face with a 60° to 100° angle; head not 

 flattened in front; hind corner of pronotum usually black 26 



26. Apical margin of clypeus weakly concave; temple swollen, the head as wide 



across midlength of temple as across eyes; coxae black. 



22. evetriae Rohwer 



Apical margin of clypeus subtruncate or in general outline weakly convex; 



temple not swollen, the head much narrower across midlength of temples 



than across eyes; coxae fulvous, rarely black in E. nigripalpis ... 27 



27. Central 0.75 of clypeal margin truncate, the lateral 0.12 weakly upturned; 



hind femur of female 2.05 as long as deep (male unknown) ; face entirely 



black 23. hiulcus, new species 



Central 0.6 of clypeal margin truncate, the lateral 0.20 weakly upturned; 

 hind femur of male about 2.45 as long as deep, of female about 2.35 as long 

 as deep; face black, usually with a dorsal median pale mark. 



24. nigripalpis Thompson 



28. Hind tibia whitish for almost entire length of its dorsal edge, the rest of the 



tibia fulvous or brownish (fig. 194,h); face of female blackish with a dorso- 

 lateral yellowish white area (fig. 179, k). (Male unknown.) 



36. externus, new species 



Hind tibia variously marked with white, fulvous, or blackish, the markings 



mostly encircling the tibia, never making a continuous whitish stripe along 



its dorsal edge; face white, black, or variously marked, but never blackish 



with a dorsolateral yellowish white area 29 



29. Hind tibia whitish medially or submedially, pale brown to black on its basal 



0.1 to 0.4, the apex fulvous to blackish (or white in some specimens of 



Exochus genitalis) (figs. 194,a-g; 194,i-195,e) 30 



Hind tibia whitish basally, the whitish area including the extreme base and 

 extending 0.15 to 0.9 the length of the tibia, the apex of the tibia fulvous 

 to black (figs. 195,f-196,f) 45 



30. Front spur of hind tibia about 4.1 as long as wide; median section of posterior 



transverse carina of mesosternum with a small, weak, blunt projection on 

 each side; face and clypeus of female blackish, the upper margin of face 



and lower margin of clypeus whitish 21. annulicrus Walsh 



Front spur of hind tibia 1.8 to 3.8 as long as wide; otherwise not entirely as 

 above 31 



31. First to fourth segments of hind tarsus white, distinctly darkened (brown to 



black) at apex (figs. 193, i; 194,f,g); front spur of hind tibia 2.4 to 3.2 as 



long as wide 32 



First to fourth segments of hind tarsus whitish, not at all or only faintly 

 darkened (stramineous) at apex; front spur of hind tibia 1.8 to 3.8 as long 

 as wide 34 



32. Thorax mostly fulvous beneath and laterally; front wing 5.3 to 6.3 mm. long; 



combined clypeus and face distinctly flattened ventrally. 



28. armillosus, new species 

 Thorax black beneath and laterally with restricted pale yellow markings, 

 rarely with restricted fulvous areas; front wing 3.3 to 5.8 mm. long; com- 

 bined face and clypeus evenly convex 33 



33. Hind tibia with approximately its basal 0.20 and apical 0.40 blackish (fig. 



194,f) ; clypeus entirely whitish 34. peroniae, new species 



