93 
Males. 
I. (No male representatives). 
II. Head not narrowed back of compound eyes, usually expanding: antenna? slen- 
der, not or scarcely compressed, and nearly if not quite as long as the entire 
insect. 
1. Black dorsally and ventrally. 
Stigma and costa more or less infuscated. 
Legs, except tibia? and tarsi, black. 
Mouth parts and orbits black 5. extensicornis Norton. 
Mouth parts and orbits pale 6. affinis n. sp. 
Legs, except bases of femora, yellow 24. tritici n. sp. 
Stigma and costa hyaline 25. apicalis n. sp. 
2. Venter and more or less of tergum pale. 
Wings hyaline; stigma brown. 
Head pale, except large spot on vertex 8. auratus n. sp. 
Head black 4. aurantiacus n. sp. 
Wings strongly infuscated; stigma and costa smoky.. 26. infumatus n. sp. 
3. Head and thorax mostly yellow; abdomen black, except tip; stigma and 
costa hyaline 27. thoracicus n. sp. 
III. Head usually distinctly narrowed back of compound eyes, never expanding; 
antenna? usually shorter, stouter, and compressed. 
1. Black, including all of venter. 
Pronotnm and tegukc black; legs beyond base of femora yellow, infus- 
cated 28. koebelei n . sp. 
Pronotum, teguhc, and legs reddish yellow 29. occidental™ n. sp. 
2. Black ; venter more or less pale. 
Orbits pale, or head with black limited to spot about ocelli. 
30. carolinensis n. sp. 
Orbits black or strongly infuscated. 
Clypeus deeply emarginate; triangle between antenna- and clypeus 
white; inner tooth of claw large 31. wrangeli n. sp. 
Clypeus deeply emarginate; triangle black; inner tooth of claw minute; 
stigma very narrow, tapering ... 32. minutus n. sp. 
Clypeus broadly emarginate, approaching truncate; triangle black; 
claws normal. 
Clypeus black ; venter infuscated laterally 20. hoodi n. sp. 
Clypeus with pale tips. 
Legs pale, except extreme tips of posterior tibia' and their tarsi. 
22. subalbatus Norton. 
Legs pale, except tips of hind femora above and apical third 
of hind tibi;e and the hind tarsi 21. corniger Norton. 
Legs reddish yellow; femora infuscated basally; abdomen 
usually entirely reddish yellow beneath. 
33. nevadcnsis n. sp. 
INDEX TO SPECIES OF I'ACIIYXE.MATUS. 
abdominalis n. sp. 9 19 
affinis n. sp. $ 9 6 
apicalis n. sp. $ 25 
ater McGillivray 9 
aurantiacus n. sp. $ 9 
auratus n. sp. 9 
aureopectus Norton = extensicornis . . 
carolinensis n. sp. $ 
coloradensis n. sp. 9 13 
corniger Norton $ 9 
dimmockii Cresson 9 
clypeatus n. sp 9 15 
21 
1 
extensicornis Norton $ 9 5 
graminis n. sp. 9 - 9 
hoodii n. sp. $ 9 20 
infumatus n. sp. $ 26 
koebelei n. sp. $ 28 
marylandicus Norton = extensicornis. 5 
