ee ee 
May, 1953 
width from end to end; sternites 7-9 each 
with a pair of sublateral, longitudinal, brown 
stripes, usually all anterior segments each 
with a pair of sublateral, brown spots; 
apex of ninth sternite with a broad, trans- 
verse, brown band, this fusing with sub- 
lateral, longitudinal marks; caudal filaments 
light brown, each filament with alternating 
articulations dark and light in the area near 
the tip. 
Known from Georgia, Illinois, Indiana, 
Iowa, Kansas, Kentucky, Minnesota, Ohio, 
Ontario, Tennessee, and Wisconsin. 
Illinois Records.—Adult specimens, col- 
lected May 5 to August 22, are from Aroma 
Park, Aurora, Batavia, Benton, Carbon- 
dale, Carlinville, Cowling, Dixon, East Du- 
buque, Effingham, Evanston, Freeport, 
Galesburg, Havana, Henry, Herod, High- 
land, Homer, Kankakee, Keithsburg, Ma- 
homet, McHenry, Momence, Mount Car- 
mel, Mount Carroll, Muncie, Murphys- 
boro, Oakwood, Oregon, Ottawa, Pontiac, 
Rockford, Rock Island, Russellville, St. 
Charles, Savanna, Springfield, Spring Grove, 
Starved Rock State Park, Urbana, Wau- 
kegan, West Chicago, White Heath, and 
Wilmington. 
9. Stenonema heterotarsale 
(McDunnough) 
Ecdyonurus heterotarsalis McDunnough 
(1933a:42). 
Stenonema affine Traver (1933a:184). 
Stenonema interpunctatum heterotarsale 
(McDunnough). Spieth (1947:110). 
Mate.—Length of body 7-9 mm., of fore 
wing 9-11 mm. Face light yellow, usually 
unmarked; each antenna with scape and 
pedicel yellow, flagellum gray-tan at base, 
hyaline at apex; eyes in life light green; 
vertex orange-brown, usually a pair of 
black dots present, one near margin of each 
compound eye. Mesonotum light brown, 
lateral margins and scutellum yellow; semi- 
membranous area anterior to base of fore 
wing yellow, occasionally edged with pink; 
pleuron yellow, unmarked; fore leg deep yel- 
low, apex of tibia and apexes of tarsal seg- 
ments dark brown or black, first tarsal seg- 
ment two-fifths to three-fifths as long as 
second segment; middle and hind legs light 
yellow; fore and middle femora with me- 
dian and apical, dark brown crossbands, 
hind femur with only apical dark band; 
wings hyaline, stigmatic area of fore wing 
Burks: THE MAyrF ties oF ILLINOIS 167 
very faintly stained with brown, veins yel- 
low-brown, crossveins black; hind wing with 
veins and crossveins yellow, outer wing mar- 
gin darkened with black shading. Abdomen 
yellow, a narrow, black crossline at posterior 
margin of each of tergites 1-8; spiracular 
dots absent; apical three tergites shaded 
with pinkish brown; genitalia, fig. 339, light 
yellow; the caudal filaments pale yellow, the 
articulations not at all or only very faintly 
darkened. 
NympH.—Length of body 9-10 mm. 
Head anterior to eyes a uniform brown; 
anterior margin usually with small, pale 
spot on meson, fairly large, pale spot on this 
margin just anterior to each antennal socket, 
two relatively small, pale spots on head mar- 
gin lateral to each compound eye. Dorsum of 
thorax mostly uniform brown; pronotum 
with a pair of sublateral, round spots and 
lateral margin pale; anterior half of meso- 
notum pale on meson; tarsal claws without 
ventral denticles. Gills borne by abdominal 
segments 1-6 pointed at apexes, gills of 
seventh pair each with one trachea; dorsum 
of abdomen uniform brown, most specimens 
with a pair of submedian, longitudinal, pale 
streaks on each of tergites 4 or 5-10, those 
on 8 and 9 much the wider and those on 10 
much reduced; sternites 5— or 6—9 each with 
a pair of sublateral, brown spots, those on 
sternite 9 extending almost the length of the 
segment and fused with a broad, transverse, 
brown band occupying apical fifth of ster- 
nite; caudal filaments light brown, in apical 
area these filaments with alternating articu- 
lations dark and light. 
Known from Illinois, North Carolina, 
Ontario, and Quebec. 
Illinois Records. — Cuicaco: July 3, 
1940, J; J. Janacek,- 1 2s july 8,.1937,.F riz 
son & Ross, 1é; at light, July 13, 1931, 
‘TAH. Frison,-7 ¢ ; Sept. 2, 1902,. Titus, 12: 
Homer: at light, June 26, 1925, R. D. 
Glasgow, 16 ; Aug. 10, 1925, T. H. Frison, 
16. KANKAKEE: June 6, 1935, Ross & 
Mohr, 34; June 15, 1938, Ross & Burks, 
44; June 29, 1939, Burks & Ayars, 12; 
July 10, 1925, T. H. Frison, 106. Mount 
VERNON: Big Muddy River, April 10, 1946, 
Mohr & Burks, 1¢, 9 N. Muwcte: Stony 
Creek, May 24, 1914, 1 ¢. Oakwoop: May 
24, 1926;-1. HH. Frison, 3:4; June 6, 1925; 
T. H.-F rison, 16 ; June 16, 1925, 13; June 
24, 1948, Mills & Ross, 26 ; June 25, 1948, 
B. D. Burks, 66. STERLING: at light, May 
