93 
Males. 
I. (No male representatives). 
IJ. Head not narrowed back of compound eyes, usually expanding; antenne 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 tibive and tarsi, black. 
Mouth parts and orbits black...-....----- 5. extensicornis Norton. 
Mouth parts and orbits pale.........-..---- adaoec 6. afinis n. sp. 
Legs, except bases of femora, yellow....-..-=+...---. 24. tritici n. sp. 
Stigmarands costa byalimes:co.2 a=. see ee ave = 25. apicalis n. sp. 
2. Venter and more or less of terguin 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 ....--.-. eee ape Sas easy ain'g se eyon see 2 gt ChORACLCUS ESD: 
Ill. Head usually distinctly narrowed back of compound eyes, never expanding; 
antenn:e usually shorter, stouter, and compressed. 
1. Black, including all of venter. 
Pronotum and tegule black; legs beyond base of femora yellow, infus- 
Caled nonce cat = eat soem celgs isc e see oares cases Secale 28. koebelei n. sp. 
Pronotum, tegulie, and legs reddish yellow --..-.-.-- 29. occidentalis 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 antenne and clypeus 
whtite; 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 
Clypeus with pale tips. 
Legs pale, except extreme tips of posterior tibiz and their tarsi. 
22. subalbatus Norton. 
Legs pale, except tips of hind femora above and apical third 
of hind tibize and the hind tarsi..----- 21. corniger Norton. 
Legs reddish yellow; femora infuscated basally; abdomen 
usually entirely reddish yellow beneath. 
33d. nevadensis N. sp. 
20. hoodi n. sp. 
INDEX TO SPECIES OF PACHYNEMATUS. 
abdomimalismosp. 9 --2---2----2.---- IOS coloradensis mas psi. aceee eee eae 13 
( —aftinis igs Uk Wr Cnt actos ee ee 6Hecormicers Norton qi Oo eeece seen ae eee 21 
apieailis NesSps oO os-2s 222 facie Gos 0 24 25°)! dimmockti Cresson 9 .-.:=:-..:----+- 1 
ater mMicGulllivaraiy Gs. 2s 6 oe. 35:5 16 | extenstcornis Norton g 9 ::-.-..-...- 5 
aurantiacus nm. sp. 6 Q .<--=-)--+25---- 4 |eraminis' Msp. O24. 2-5 selse-2---s54- 9 
AULA DUST SPs Oyen oig3-< <5 2 so1155 = 5,2 $)|hooditn. sp. ¢ 2 .-4-- eee ase ooee 20 
aureopectus Norton = extensicornis.. 5 | infumatusn.sp. ¢.--.--.-.----.------ 26 
CALOLMENSIS NSP. Gcemete se. -.--s='- 22. SOR PMKGODElEI MSPs rec anes ose ese eee - 28 
clypeatus n. spQ...-.. Saeko Sole nereas 15 
marylandicus Norton—extensicornis. 5 
