May, 1953 
segment lacking ventral, filamentous 
tuft; each tarsal claw with a prominent 
basal tooth and a row of minute ven- 
Burxks: THE MAyr ties oF ILLINOIS 183 
round, first tergite almost entirely 
white, fourth and eighth each with a 
large, median, white mark...3. pulla 
Eralmeenticless tie; Soleo. «. ot oe. 5 4. Venter of abdomen entirely white or light 
Venter of abdomen light yellow to white, yellow, without darker markings...... 
and with a longitudinal, dark brown .4. marginalis 
bar extending the length of the abdo- Posterior margin of ninth sternite with a 
men near either lateral margin. yo broad, dark brown border........... 
Venter of abdomen light yellow to white, Vase hye Fah os oe 6. flavescens 
and entirely without darker markings, 5. Caudal filaments entirely white, articula- 
or with dark shading present only at tions not darkened.. .10. lucidipennis 
posterior margin of ninth sternite ..4 Caudal filaments white, with articulations 
Abdominal tergites almost entirely dark brown, or these filaments tan, gray, or 
brown, with only a pair of submedian Biro wittee, ema series MS Fis Seve ae 6 
and a pair of anterolateral, small, white 6. Caudal filaments white, with articula- 
marks on each tergite, fig. 383........ GONSADLOWN Aas) Sey ae oe 7 
So ct oe OE ee 2. diabasia Caudal filaments tan, brown, or gray...8 
Abdominal tergites with dark brown 7. Abdominal sternites 8 and 9 each with a 
shading more restricted: submedian and 
relatively 
lateral marks large and 
MACULIPENNIS 
JUNO 
38| 
MINERVA 
short, transverse, brown mark on meson 
of anterior margin.......... 16. juno 
WALSHI 
APHRODITE 
> 
382 
Fig. 380.—Heftagenia aphrodite, male geni- 
talia. 
Fig. 381.—Heptagenia maculipennis, middle 
tarsal claw of mature nymph. 
Fig. 382.—Heptagenia diabasia, middle tar- 
sal claw of mature nymph. 
Fig. 375.—Heptagenia hebe, male genitalia. 
Fig. 376. — Heptagenia maculipennis, male 
genitalia. 
Fig. 377.—Heptagenia walshi, male genitalia. 
Fig. 378.—Heptagenia juno, male genitalia. 
Fig. 379.—Heptagenia minerva, male genitalia. 
