May, 1953 Burks: THE Mayr igs oF ILLINotrs a5 
= 
acre ory TS] 
rT A} xd 
», SSae a 
©, 
a TY rr ot 
Oss See Ges ene oe ee T 
pata an 
——— 
Se 
x a S, 
YK NS 
NSS 
(\ 
7 a ai SS a eee 
SSS 
A\NSicccsaneegeaeee 
ae VRIES 
WS CO 
LEZELER™: EFF EIT 
‘i - 3 {77> 
aoe SE oe a ee 22722 2s wen ses 
= a7 gy Pe aS 
Fig. 38—Ephoron leukon, fore wing. Fig. 43.—Potamanthus verticis, hind wing. 
Fig. 39.—E phoron leukon, hind wing. Fig. 44.—Tortopus primus, fore wing. 
Fig. 40.—Pentagenia vittigera, fore wing. Fig. 45.—Tortopus primus, hind wing. 
Fig. 41.—Pentagenia vittigera, hind wing. Fig. 46.—Ephemera simulans, fore wing. 
Fig. 42.—Potamanthus verticis, fore wing. Fig. 47.—Ephemera simulans, hind wing. 
