ICHNEUMON-FLIES, PART 2'. XORIDINAE 453 



11. Flagellum with 29 to 32 segments; second segment of flagellum about 2.0 as 



long as wide; punctures on temple separated by about 3.0 their diameter. 



13. curtum, new species 



Flagellum with 35 to 41 segments; second segment of flagellum about 2.25 as 



long as wide; punctures on temple separated by about 1.0 to 2.0 their 



diameter 17. dichrous (Rohwer), in part 



12. Coxae and femora black 13 



Coxae and femora ferruginous or fulvous 14 



13. Punctures on mesoscutum dense, separated by about 1.2 their diameter; 



propodeum without distinct teeth; second tergite somewhat rugulose and 



with rather dense small punctures 8. aethiops (Cresson) 



Punctures on mesoscutum sparse, separated by about 4.0 their diameter; 

 propodeum with distinct teeth; second tergite polished, almost without 

 punctures 19. dreisbachi, new species 



14. Distal side of tooth on hind femur ending abruptly, not continued distally on 



to femur as a ridge; thorax about 2.8 as long as high; ovipositor sheath about 



2.0 as long as front wing 6. depressum, new species 



Distal side of tooth on hind femur ending gradually, continued on to adjacent 

 part of femur as a sharp ridge; thorax less than 2.8 as long as high; ovipositor 

 sheath less than 2.0 as long as front wing except in occasional specimens 

 of O. vicinum 15 



15. Propodeum and pronotum completely rugulosopunctate so that none of the 



surface is smooth; thorax about 2.6 as long as high. 



7. alaskensis (Rohwer) 



Propodeum and pronotum not completely rugulosopunctate, half or more 



of their surfaces relatively smooth (though punctate); thorax about 2.1 to 



2.6 as long as high 16 



16. Mesoscutum densely punctate, the punctures on median part of each of the 



three lobes separated by about 1.2 their diameter 17 



Mesoscutum less densely punctate, the punctures on median part of each 

 of the three lobes separated by about 1.8 to 5.0 their diameter .... 18 



17. Hind femur without a distinct infuscation; hind tibia ferruginous or fusco- 



ferruginous; punctation a little coarser . . .10. punctatum (Cushman) 



Hind femur with a large apical dorsolateral infuscation; hind tibia fuscous; 



punctation a little finer 11. canadense (Provancher) 



18. Temple strongly flaring, the head about 1.09 as wide across temples as across 



eyes; petiolar area of propodeum about 0.31 as long as combined areola 

 and basal area; ovipositor sheath about 1.85 as long as front wing. 



23. vicinum (Cresson) 



Temple not or only weakly flaring, the head about 0.95 to 1.06 as wide across 



temples as across eyes; petiolar area of propodeum 0.4 to 0.8 as long as 



combined areola and basal area; ovipositor sheath about 1.1 to 1.7 as long 



as front wing 19 



19. Fifth segment of hind tarsus about 1.9 as long as second segment; second 



segment of middle tarsus about 1.2 as long as deep; second segment of 

 flagellum about 1.6 as long as first segment, about 1.75 as long as wide. 



12. mellipes (Say) 



Fifth segment of hind tarsus about 1.2 to 1.7 as long as second segment; 



second segment of middle tarsus about 1.4 to 1.8 as long as deep; second 



segment of flagellum about 1.2 to 1.5 as long as first segment, about 2.6 



as long as wide 20 



