ICHNEUMON-FLIES, PART 2: EPHIALTINAE 115 



Lower half of mesepimerou bare or with a few hairs along its hind edge; 

 clypeus usually without a distinctly delimited basal area 8 



8. Ovipositor sheath 4 to 6 times as long as head and body; body short and 



stout; temples slightly bulging. Cephalotes group (p. 127). 



6. cephalotes (Holmgren) 

 Ovipositor sheath 1 to 3 times as long as head and body 9 



9. Dorsal lobe of tip of lower valve of ovipositor tapered off at hind end (fig. 



330, d); nervellus broken between its middle and its upper 0.40; prepectal 

 carina complete above, reaching the swelling along front margin of meso- 



pleurum. Tuberculatum group (p. 121) 10 



Dorsal lobe of tip of lower valve of ovipositor ending abruptly at hind end 

 (figs. 330, e,f); nervellus broken near or above its upper 0.40; prepectal 

 carina complete or incomplete above. Irritator group (p. 128) except for 

 D. irritator (see couplet 1) 11 



10. Nervellus broken near its middle; front wing 5.3 to 11.7 mm. long; face almost 



fiat, its punctures fine 4. terebrans (Ratzeburg) 



Nervellus broken near its upper 0.40; front wing 10.8 to 17 mm. long; face 

 convex medially, its punctures rather coarse . 5. tuberculatus (Fourcroy) 



11. Temple bulging laterally a little beyond outside tangent of eye; flagellum 



rather short, the fifth segment from apex about 1.1 as long as wide. 



10. buccatus, new species 

 Temple not bulging beyond outside tangent of eye 12 



12. Prepectal carina ending dorsally usually near level of lower 0.3 of hind edge 



of pronotum (but sometimes extending faintly farther dorsad) ; hind femur 

 entirely fulvous, without an apical fuscous mark; spinelike hairs on middle 

 tibia rather dense; punctures on outer face of hind femur rather sparse, 



separated by about 3 to 6 times their diameter 13 



Prepectal carina ending dorsally near level of middle of hind edge of pronotum; 

 hind femur fulvous with its apex more or less infuscate, sometimes entirely 

 infuscate; spinelike hairs on middle tibia rather sparse; punctures on outer 

 face of hind femur rather dense, separated by about 2 to 3 times their 

 diameter 14 



13. Ovipositor teeth just behind dorsal lobe very oblique, not separated from last 



tooth on dorsal lobe by a gap (fig. 330, e); ovipositor sheath about 1.25 as 

 long as front wing; first tergite about 1.3 as long as wide. 



7. populneus (Ratzeburg) 

 Ovipositor teeth just behind dorsal lobe subvertical, separated from last tooth 



on dorsal lobe by a gap (fig. 330, f); ovipositor sheath about 1.65 as long as 

 front wing; first tergite about 1.9 as long as wide . 8. messor (Gravenhorst) 



14. Ovipositor sheath about 2.7 as long as front wing 15 



Ovipositor sheath 1.4 to 1.7 as long as front wing 16 



15. Shaft of lower valve of ovipositor approximately smooth; tergites 2 to 4 



transversely punctatoaciculate behind the tubercles; hind femur fuscous; 



clypeus not unusually flattened 11. flexilis, new species 



Shaft of lower valve of ovipositor minutely roughened and with irregularly 

 spaced small tubercles; hind femur fulvous, its apex fuscous; clypeus un- 

 usually flattened 12. acieulatus (Hell6n) 



16. Front wing 7.0 to 12.5 mm. long; temple rather strongly swollen; propodeum 



rather elongate, with rather sparse punctures; hind tibia whitish on basal 

 0.15±; hind corner of pronotum black or narrowly and obscurely ferrugi- 

 nous; last four segments of maxillary palpus white . 16. pygmaeus (Walsh) 



