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. 
Metanotuni more or less yellow ; tergum yellow 4. aurantiacus n. 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 iufuscated bases of femora. 
Stigma and costa pale; wings hyaline. 
Sheath broad, obliquely truncate; largo species. 
5. extensicomis Norton. 
Sheath rather narrow, tapering regularly 0. affitiis n. sp. 
Stigma and costa pale; wings infuscated 7. suadus Cresson. 
Stigma and costa dark brown 8. aitratus 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 coxa' black basally. 
Ifaaepimera black 9. graminis n. sp. 
lietepimera 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. pubescent n. sp. 
Head and thorax not unusually pubescent; stigma robust; mes- 
epimera black. 
Femora and venter mostly pale; large, robust species. 
12. montiragu8 n. sp. 
Femora and venter black ; small species. 13. colomdemis n. sp. 
Stigma brown or black. 
Labium, angles of pronotum, and tegulae pale. 
Clypeus black ; bases of femora infuscated. . 14. robustus n. sp. 
Clypeua with pah; tips; femora pale 15. clypeatus n. sp. 
Labrum, angles of pronotum, and teguhe black. 
16. ater McGillivray. 
III. Sheath as above; head narrowing more or less back of compound eyes; usually 
slender, elongate, black species, with brown costa and stigma. 
Sheath narroAv, regularly rounded at tip; stigma acuminate; venter pale; 
pectus black 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. 
Femora pale 20. hoodi n. sp. 
Anterior femora pale ; hind iufuscated at tip 21. corniger Norton. 
Femora all more or less infuscated or black. 
Anterior femora light basally; basal half posterior tibiae white. 
22. subalbatus Norton. 
Anterior femora infuscated basally, paling apically ; posterior tibiae 
gradually infuscated, more strongly toward tip. 
23. palliventris Cresson. 
