May, 1953 
brown crossband in middle and at apex, 
each middle and hind tibia with a subbasal, 
red-brown spot; wings hyaline, stigmatic 
area stained with brown, outer margin of 
hind wing shaded with brown, veins of fore 
wing a faint yellow-brown, crossveins dark 
brown, veins and crossveins of hind wing 
hyaline. Abdomen chalky white, each ter- 
gite 1-9 with a narrow, black crossline at 
posterior margin, those on tergites 8 and 9 
often interrupted on the meson; a _longi- 
tudinal, dark gray line on meson of tergites 
3 and 6, sometimes also on tergites 2 and 7; 
in each spiracular area of segments 3-8 an 
oblique, dark brown streak present, occa- 
sionally these markings becoming obsolete 
on anterior and posterior segments but al- 
ways persisting on at least segments 5 and 
6; genitalia, fig. 352, white; caudal filaments 
white, articulations dark red-brown. 
Known from Georgia, Illinois, Indiana, 
Kansas, Kentucky, Michigan, Minnesota, 
Missouri, and North Carolina. 
Illinois Records.—Adult specimens, col- 
lected June 7 to August 27, are from Alton, 
Aroma Park, Dixon, East Dubuque, Eliza- 
bethtown, Foster (Mississippi River), Free- 
port, Fort Kaskaskia State Park, Kankakee, 
Keithsburg, Momence, Monmouth, Monti- 
cello, Oregon, Poplar Bluff, Prophetstown, 
Quincy, Rockton, Shawneetown, Urbana, 
and Wilmington. 
24. Stenonema nepotellum 
(McDunnough) 
Ecdyonurus nepotellus McDunnough 
(1933a:20). 
Although the nymphs of this species and 
those of rubromaculatum are, as pointed out 
by McDunnough (1933a:20), quite differ- 
ent, the adults of the two species are very 
similar. Freshly collected, dry specimens of 
the adult males can, however, be separated 
by color characters. 
Matre.—Length of body 8-9 mm., of fore 
wing 8-11 mm. Face below antennal sockets 
light yellow, vertex yellow, shaded with 
orange-brown; eyes in life pearl-gray; each 
antennal scape orange-brown, pedicel tan, 
flagellum tan at base, hyaline toward apex. 
Thoracic notum yellow-brown, mesoscutel- 
lum and lateral margins of posterior half 
of mesonotum white; pleuron pale yellow, 
with brown shading dorsal to coxae, semi- 
membranous area anterior to fore wing base 
Burks: THe Mayer ies or ILiinNois 177 
red-brown; sternum pale yellow, mesofurci- 
sternum shaded with tan. Fore leg pale 
yellow-brown, apex of tibia and apexes of 
tarsal segments very dark brown or black, 
first fore tarsal segment one-half as long 
as second segment; middle and hind legs 
pale yellow, each femur of all legs with a 
median and an apical, red-brown crossband; 
wings hyaline, basal part of stigmatic area 
red, entire stigmatic area also stained with 
light brown; all veins and crossveins of 
fore wing brown, anterior ones of hind wing 
brown, posterior ones hyaline; crossveins in 
bullar area of fore wing not crowded. Ab- 
domen yellow, a black crossline at posterior 
margins of tergites l— or 2-7; large spi- 
racular dots present; apical tergites shaded 
with pinkish brown, almost all of tergite 8 
suffused with this color, tergite 10 with 
narrow, white area at posterior margin; 
abdominal venter yellow; genitalia, fig. 353, 
white; caudal filaments white, articulations 
red-brown. 
NympH.—Length of body 7-9 mm. An- 
terior border of head rather truncate, lack- 
ing a median, pale spot; large, pale spot on 
lateral margin of head lateral to each com- 
pound eye, this pale spot sometimes divided 
by a brown crossbar. Pronotum with a 
broad, pale area at either lateral margin; 
tarsal claws without ventral denticles. Ab- 
dominal dorsum with rather vague color 
pattern of light and dark spots, tergites 5 
and 7 predominantly pale, others mostly 
dark; gills borne by segments 1-6 truncate 
at apexes, gills of seventh pair without 
tracheae; abdominal venter white, each of 
sternites 2— or 3-8 with a curved, brown 
crossbar borne near anterior margin, these 
bars wider and more intensely colored on 
posterior segments; sternite 9 with a U- 
shaped, brown mark, the open end directed 
posteriorly, occasional specimens with basal 
crossbar of this U-shaped mark faint or 
obsolete; posterolateral angles of abdominal 
segments 3-9 spinelike, those borne by seg- 
ment 9 long and slender; caudal filaments 
light brown near bases, apically alternating 
pairs of segments dark and light. 
Known from Illinois, Indiana, Ohio, On- 
tario, Quebec, and Wisconsin. 
Illinois Records. — Oakwoopn: July 14, 
1939, Burks & Riegel, 14; July 30, 1939, 
Burks & Riegel, 14 ; Aug. 4, 1939, Burks 
& Riegel, 16; Aug. 10-14, 1939, B. D. 
Burks, 3¢, 32, 5 N. Sprrnc Grove: June 
