168 Ittinois Natura History Survey BULLETIN 
21, 1925, D. H. Thompson, 1 6. WAUKE- 
GAN: July 16, 1935, Ross & DeLong, 44 ; 
Aug. 4, 1926, 1¢. Witmincron: May 27, 
1935, Ross & Mohr, 1¢. 
TRIPUNCTATUM Group 
10. Stenonema tripunctatum (Banks) 
Hepiagenia tripunctata Banks (1910:199). 
Stenonema femoratum tripunctatum (Banks). 
Spieth (1947:99). 
Mace.—Length of body 8-11 mm., of fore 
wing 10-13 mm. Head tan to pale yellow, 
a brown line crossing face just ventral to 
antennal bases, vertex shaded with light 
brown along inner margins of compound 
eyes; each antennal scape brown, pedicel 
completely light brown or light brown only 
at apex and with basal part yellow, flagel- 
lum tan at base, becoming hyaline at apex; 
each compound eye in life pearl-gray, usu- 
ally with a brown crossband, the two com- 
pound eyes separated on meson by a space 
as wide as lateral ocellus. Thoracic notum 
varying from uniform brown to pale yellow, 
almost white; each pleuron tan to pale yel- 
low, always with darker shading ventral to 
base of fore wing; sternum tan to yellow; 
all coxae darkened with gray-tan, fore femur 
tan to yellow-brown, fore tibia and tarsus 
yellow to tan, apex of tibia and apexes of 
tarsal segments dark brown, first tarsal seg- 
ment from two-fifths to one-half as long as 
second segment; middle and hind legs yellow 
to tan; each femur of all legs with median 
and apical, red-brown crossbands, each of 
middle and hind tibiae with a red spot near 
base; wings hyaline, stigmatic area shaded 
with brown, proximal part also with red 
suffusion, all veins and crossveins dark 
brown, outer margin of hind wing hyaline; 
in fore wing, veins crowded in region of 
bulla. Ground color of abdomen varying 
from light brown to light yellow, almost 
white; darker specimens with two mesal, 
dark brown stripes extending the length of 
abdomen and with a broad, dark brown 
crossband at posterior margin of each ter- 
gite; all specimens with a median, black dot 
and a pair of submedian, black dashes at 
posterior margin of each tergite 2-9; apical 
tergites uniformly shaded with dull tan or 
brown; abdominal sternites tan, with vague, 
brown shading near either lateral margin 
of each sternite, or uniform, light yellow; 
Vol. 26, Art. 1 
genitalia, fig. 340, tan to yellow; caudal 
filaments tan or yellow, articulations brown. 
Nympu.—Fig. 360. Length of body 9-12 
mm. Head brown, freckled with pale dots, 
with a median and two sublateral, pale spots 
on anterior margin, a pair of large, pale 
i 
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SSS tL 
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Fig. 360.—Stenonema tripunctatum, mature © 
nymph, dorsal aspect. 
spots lateral to each compound eye, and 
posterior margin of vertex mostly pale; pro- 
notum brown, with relatively few pale dots 
and usually four pale spots near each lateral - 
margin; each tarsal claw with two ventral 
denticles. Gills borne by abdominal segments 
1-6 rounded at apexes, gills of seventh pair 
each with one or two longitudinal tracheae; 
abdominal tergites mostly brown, large, 
white, median spots on tergite 5, a pair of 
small, submedian, white spots at base and 
apex of tergites 6 and 7, and large, median, 
white spots on tergites 8 and 9; posterolat- 
