ICHNEUMON-FLIES, PART 2 '. EPHIALTLNAE 313 



Artificial key to the Nearctic species of Coccygomimus 



1. Thorax and head entirely ferruginous; abdomen black banded with white. 



10. marginellus (Brull6) 



Thorax and head black; abdomen black, fulvous, or ferruginous, not banded 



with white 2 



2. Abdomen ferruginous or fulvous 3 



Abdomen black, sometimes the apicolateral corners and the apical margins 



of its tergites more or less fulvous 4 



3. Coxae black; epipleura of third and fourth tergites about 3.5 as long.as wide. 



4. ellopiae (Harrington) 

 Coxae fulvous; epipleura of third and fourth tergites about 1.5 as long as 



wide 17. dimidiatus, new species 



4. Hind tibia entirely black, without a submedian pale band; nervulus usually 



postf ureal; first tergite rather long; epipleura of third and fourth tergites 



about 4.0 as long as wide 5 



Hind tibia not entirely black, when largely black or blackish it has a sub- 

 median pale band (but entirely black in occasional specimens of C. aquilo- 

 nius exareolatus) ; nervulus interstitial or briefly postf ureal; first tergite 

 short 7 



5. Middle and hind coxae fulvous 2. pedalis (Cresson) 



Middle and hind coxae black 6 



6. Hind femur mostly fulvoferruginous; wings hyaline . 1. silvicola (Walley) 

 Hind femur black; wings moderately infuscate in male, strongly infuscate in 



female 3. maurus (Cresson) 



7. Trochanters black except that second trochanter of hind leg may be fulvous; 



coxae black; hairs on head and thorax dark brown . . 6. sodalis (Ruthe) 

 Trochanters fulvous, or rarely some of them black; coxae fulvous or some- 

 times black; hairs on head and thorax light gray 8 



8. Epipleurum of fourth tergite more than 4.0 as long as wide in male, more 



than 2.2 as long as wide in female (fig. 329,j) ; front of scape of male usually 

 marked with white; punctures and hairs on body and legs unusually dense. 



5. aquilonius (Cresson) 

 Epipleurum of fourth tergite less than 3.0 as long as wide in male, less than 



2.2 as long as wide in female (figs. 329, k,l) ; front of scape of male entirely 

 black 9 



9. Hind femur with its apical 0.2 ± fuscous; hind tibia black with a distinct 



whitish band 10 



Hind femur entirely fulvous, or its apical 0.1 ± sometimes faintly infuscate; 

 hind tibia varying from entirely fulvous to black with a white band . 14 



10. Epipleurum of second tergite very narrowly wedge-shaped, more than 3.0 as 



long as wide (fig. 329, k) ; tegula black 7. tenuicornis (Cresson) 



Epipleurum of second tergite broadly wedge-shaped, less than 3.0 as long as 

 wide (fig. 329,1) ; tegula white, brown, or black 11 



11. Males. (Males of three species are not distinguishable with certainty. The 



male of C. nudus is not definitely known.) . . 13. aequalis (Provancher) 



14. nudus (Townes) 



15. annulipes (Brull6) 



Females 12 



526527— 60 21 



