May, 1953 
10. 
i 
rounded or truncate at apexes, figs. 
SNE 7/ SIS yo Ben anttier tet a ne 6 
Dorsum of abdomen almost entirely 
brown, each tergite with only a pair of 
short, submedian streaks at anterior 
MIVAT A IMEVARE Reh ates Sem hyd a 1. carolina 
Dorsum of abdomen marked otherwise. .3 
Abdominal dorsal color pattern made up 
of a series of large, elongate and sub- 
median, pale spots, with a transverse, 
black, median line at posterior margin 
Gimeachmot ctengites: I-Oe fs es 
7 Sud Va eee 3. gildersleevei 
Abdominal dorsum with a pair of sub- 
median, pale, longitudinal stripes, in 
most specimens these markings almost 
or quite continuous, but in others con- 
fined to tergites 4— or 5-10 and, in that 
case, stripes suddenly widened on 
tergites 8 and 9, constricted again on 
Submedian, pale stripes present on ter- 
gites 3— or 4-10 only, these stripes sud- 
denly widened on tergites 8 and 9, con- 
stricted again on tergite 10.......... 
35 Jhuhe epee fete dita eerste 9. heterotarsale 
Submedian, pale stripes extending length 
of abdomen and not suddenly widened 
Onetercitesromandeg!) 0.4 a. ems 5 
Apex of ninth sternite entirely pale or 
very faintly stained with brown; an- 
terior, dorsal margin of head usually 
with a pale, median spot. .7. frontale 
Apex of ninth sternite with a broad, dark 
brown crossband; anterior, dorsal mar- 
gin of head without a pale, median spot 
or with such a spot only very faintly 
dicated ..-.. 2. candidum; 6. cana- 
dense; 8. interpunctatum 
Gills borne by abdominal segments 1-6 
rounded at apexes, fig. 357 7 
Gills borne by abdominal segments 1-6 
fruncate, ateapexes. tie. 359) 00.) 8 
Median, pale spot usually present on 
anterior margin of head; sublateral, 
brown spots present on sternites 2-8. . 
\ papcacTeth tic Aa as aE 10. tripunctatum 
Median, pale spot absent from anterior 
margin of head; sublateral, brown spots 
present on sternites 5— or 6-8, some- 
times these spots entirely absent.» 
+ ales BOE AOR Ei eae cere 11. femoratum 
Each tarsal claw with two minute ventral 
denticlesineanutip isn) lites ee on: 9 
Tarsal claws without ventral denticles.13 
Posterolateral angles of abdominal seg- 
ments 3— or 4-9 spinelike... 
Posterolateral angles of abdominal seg- 
ments 6— or 7-9 spinelike.......... 11 
Pale spot on meson of anterior margin of 
head; abdominal dorsum light brown, 
with large, median, pale spots on ter- 
gites 5, 8, and 9 .12. bipunctatum 
Head without median, pale spot on ante- 
rior margin; abdominal dorsum usually 
dark brown, apical tergites sometimes 
with small, faint, pale spots at anterior 
Marois eis. 25. rubromaculatum 
Each abdominal sternite 2-8 with some- 
what irregular, brown shading extend- 
14. 
15. 
16. 
7 
Burks: THe Mayr ties oF ILLInots 161 
ing across posterior margin and at each 
lateralemancinanee msn 20. luteum 
Each abdominal sternite 1-7 entirely 
white, sternite 8 either entirely white, 
or with only a small, median, brown 
Spotwat anterion marein........... 12 
Normally exposed portions of abdominal 
tergites 1-10 uniformly brown, some- 
times with faint, median, lighter spots 
on apical tergites. 26. rubrum 
Normally exposed portions of abdominal 
tergites 1-5, 7, and usually 9 mostly 
white, but with some small, brown 
markings; tergites 6, 8, and 10 almost 
entirely brown, tergite 9 sometimes also 
mostly brown........27. pulchellum 
Posterolateral angles of abdominal seg- 
ments 6— or 7—9 spinelike........... 14 
Posterolateral angles of abdominal seg- 
MEM sus — Or 4.-ONsminelike ans 15 
Abdominal sternites 4— or 5-8 each with 
a medianly sinuate, transverse, brown 
cross-stripe located near middle of 
REERIIGEI As osee a dre ccs BS 17. ithaca 
Abdominal sternites 1-8 white, without 
markings except for slight, vague 
darkening along lateral margins of 
more posterior sternites...... 13. ares 
Abdominal sternites 3— or 4-8 each with 
a brown crossbar located at posterior 
ITA AT OiMce heer Fert meron ase cen teen ee 16 
Abdominal sternites 3— or 4-8 each with 
transverse, brown shading at anterior 
margin or in middle of sternite...... 17 
Sternite 9 with entire posterior half dark 
DEOWN ys a he ee 15. vicarium 
Sternite 9 with a pair of large, brown, 
sublateral spots at posterior margin... 
Sage 16. fuscum 
Each sternite 3— or 4-8 with a transverse, 
brown bar occupying median two- 
thirds of anterior margin. 14. pudicum 
Each sternite 3— or 4-8 with a medianly 
sinuate, brown crossband extending 
from side to side near anterior margin. 
SOUR SEER eee ly Pe 24. nepotellum 
INTERPUNCTATUM Group 
1. Stenonema carolina (Banks) 
Heptagenia carolina Banks (1914:616). 
Mate.—Length of body 9-10 mm., of 
tore wing 11-12 mm. Compound eyes rela- 
tively small, separated on vertex by a space 
as wide as one eye; head and thorax yellow 
to tan-yellow; first fore tarsal segment one- 
half to three-fifths as long as second seg- 
ment; 
veins red-brown; 
wings hyaline, with veins and cross- 
basal subcostal and first 
radial crossveins blackened and widened at 
their anterior ends, 
and two crossveins in 
first radial interspace, below bulla, thickened 
and blackened in the middle, these marks 
sometimes fusing to form a _ longitudinal, 
