92 
II. Sheath normal, but slightly projecting; tip usually obliquely truncate or taper- 
ing; head strongly developed and widening back of compound eyes; second recur- 
rent vein usually interstitial; rather robust species; stigma and costa usually 
hyaline. 
Metanotum more or less yellow; tergum yellow.-.---.-.--- 4, aurantiacus 0. sp. 
Metanotum and tergum black. 
Head (except usually a spot about ocelli) and more or less of mesonotum 
pale. 
Mesonotum pale or with two or three black spots; body beneath pale 
except rarely black spot on pectus and infuscated bases of femora. 
Stigma and costa pale; wings hyaline. 
Sheath broad, obliquely truncate; large species. 
5. extensicornis Norton. 
Sheath rather narrow, tapering regularly...... 6. afinis n. sp. 
Stigma and costa pale; wings infuscated..-...- 7. suadus Cresson. 
Stigma and costa dark brown ......-..----.----- 8. auratus n. sp. 
Mesonotum mostly black, with one or two pale spots, or sutures pale; 
mesepimera black, except sometimes lateral light spot; venter more 
or less infuscated ; femora and cox black basally. 
Miesepimera black: - 2. we sete oee ee obo ore errs 9. graminis n. sp. 
Mesepimera with lateral white spot---..----- 10. pleuricus Norton. 
Head black; orbits black or strongly infuscated; thorax and abdomen 
black except sometimes central area of venter. 
Stigma and costa pale. 
Head and thorax with long, dense pubescense; stigma narrow, 
acuminate; reddish spot on mesepimera. ---. 11. pubescens n. sp. 
Head and thorax not unusually pubescent; stigma robust; mes- 
epimera black. 
Femora and venter mostly pale; large, robust species. 
12. montivagus n. sp. 
Femora and venter black; small species. 13. coloradensis n. sp. 
Stigma brown or black. 
Labrum, angles of pronotum, and tegule pale. 
Clypeus black; bases of femora infuscated.. 14. robustus n. sp. 
Clypeus with pale tips; femora pale.-..-.-. 15. elypeatus n. sp. 
Labrum, angles of pronotum, and tegule black. 
16. ater MeGillivray. 
III. Sheath as above; head narrowing more or less back of compound eyes; usually 
slender, elongate, black species, with brown costa and stigma. 
Sheath narrow, regularly rounded at tip; stigma acuminate; venter pale; 
MecbUS DIAC ~scsk ae wes ce Sse sicko ase Daceee ae eee See 17. nigropectus Cresson. 
Sheath moderately robust, more or less obliquely truncate, tip obtusely 
pointed; stigma broad, not acuminate. 
Tergum reddish yellow; head coarsely, rugosely punctured. 
18. punctulatus n. sp. 
Tergum black, except lateral rufous spot on segments 2 to 5. 
19. abdominalis n. sp. 
Tergum black. 
Wemora: palles..ussswecinsen + ttsesertice state eee pometetteee 20. hoodi n. sp. 
Anterior femora pale; hind infuscated at tip ---. 21. corniger Norton. 
Femora all more or less infuscated or black. 
Anterior femora light basally; basal half posterior tibize white. 
22. subalbatus Norton. 
Anterior femora infuscated basally, paling apically ; posterior tibiz 
gradually infuscated, more strongly toward tip. 
23. palliventris Cresson. 
