86 
10. 
‘ge 
12: 
V3: 
14. 
sey 
16. 
ILLINOIS NATURAL History SuRVEY BULLETIN 
Right clasper with a preapical en- 
largement which is somewhat rec- 
tangular and produced into an 
apical point, e.g., incurva, lathyri.. 7 
Apical hook of right clasper long and 
shatp, gel leo eeae incurva, p. 88 
Apical hook of right clasper shorter 
and with tip slightly serrate. 
Soke cla Serer eae lathyri, p. 91 
Right clasper with base bulbous, cen- 
ter constricted and apex expanded 
into an upturned, serrate lobe, e.g., 
GINOVDNGE A TCULET 1 awn ee eee 9 
Right clasper otherwise, without an 
upturned, apical lobe, e.g., minor— 
SOLICLS Megeatighitete Whoa aie tte ate 10 
Serrate margin of apical lobe more 
irreculanpangaetruncate ean ee 
ods ie reek eee: amorphae, p. 90 
Serrate margin of apical lobe regular, 
curving back on to inner curve of 
lobed, par ae trmcerte ser reuteri, p. 91 
Apex of right clasper obliquely trun- 
cate, flat and serrate, e.g., minor. .11 
Apex of right clasper pointed or ir- 
regular, with a second row of serra- 
tions on dorsal or mesal side, e.g., 
CUNECIG=IGIIGLS Meee OR i 
Left clasper with dorsal tooth small. . 
Pe ae minor, p. 88 
Left clasper with dorsal tooth large, 
C20 GUL SE eee een oe neta ee Ne 
Right clasper with both dorsal and 
ventral corners expanded and sharp 
Re tee eee tor 4a ec, davisi, p. 87 
Right clasper with ventral corner 
round:and moe pan cceer ee rere 
i os Bee ee confluenta, p. 87 
Right clasper with apex rounded and 
curved Ven trad: sa. cuneata, p. 89 
Right clasper with apex horizontal 
and poin tedyecat., c4/1Cls pemen eee 14 
Apex of right clasper with a double 
row of dorsal Sserrationss sae ee 
Me he heres tala: heidemanni, p. 88 
Apex of right clasper with second row 
of dorsal serrations separated mesad 
as a definite lobe...... salicis, p. 89 
Length of first antennal segment 
equal to or greater than width of 
VertexeDeL Ween (cv ecu ae mmr =e 16 
Length of first antennal segment less 
than width of vertex between eyes.22 
Bases of first and second antennal seg- 
ments equal in thickness, second 
13: 
1D: 
20. 
DA 
pale 
23% 
Vol. 22, Arie 
segment tapering apically to be- 
come more slender than first seg- 
MENt. we .6 ons od 17 
Base of second antennal segment not 
so thick as base of first. 2.aeeeeee 18 
. Length of second antennal segment 
approximately twice width of head 
across eyes; length’5:cOgg ous 
.instabilis, p. 91 
leneth ft eee antegn segment 
distinctly greater than twice width 
of head across eyes; length 6.70. ... 
Jog Pe iia reuteri, p. 91 
Corium bearing both simple and seri- 
ceous pubescence; pronotal disk 
with erect, stiff, black hairs; general 
color yellowish to orange; scutellum 
and inner half of cortum and clavus 
blackish; length 6.407572. 
sontz Sate nen ae robiniae, p. 89 
Corium with only simple pubescence; 
or, 1f a few minute, sericeous hairs 
present, pronotal disk without 
erect hairs, .......) =n 19 
Length of second antennal segment 
more than twice width of head 
across eyes; length 7.00 =a 
jo ee eee eee staphyleae, p. 90 
Length of second antennal segment 
less than twice width of head across 
Scutellum with a few black, bristle- 
like hairs; juga red; dorsum also 
with a broad, reddish area; length 
5.20=5.402.., |. eee media, p. 89 
Scutellum with minute, soft pubes- 
cence only; juga palé=3= eee 21 
Second antennal segment clothed 
with very short, recumbent, golden 
pubescence... aaa cuneata, p. 89 
Second antennal segment clothed with 
prominent, semierect, black, bristle- 
likethairs@. (2.0 ean salicis, p. 89 
Second antennal segment thickened, 
diameter near base equal to that of 
first segment although tapering 
apically to become more slender. . 
PES ae Sie reuteri, p. 91 
Second antennal segment slender, its 
greatest thickness not approaching 
that of first segment... ee 23 
Length of second antennal segment 
equal to twice width of head across 
eyes; length 6.50... - 
