May, 1953 
hind femur sometimes reduced or wanting; 
the first fore tarsal segment three-fifths to 
two-thirds as long as second; wings hy- 
aline, veins light yellow-brown, crossveins 
in anterior two-thirds of fore wing dark 
brown, those in basal half of first radial 
interspace thickened and blackened in the 
middle, a longitudinal, black dash below the 
bulla usually not present, but occasionally 
faintly indicated, the stigmatic area faintly 
stained with brown, outer margin of hind 
wing slightly darkened. Abdomen bright 
yellow, with a black, transverse line at 
posterior margin of each tergite and with a 
slightly wider, black mark at meson and 
near either lateral margin, somewhat sug- 
gesting the color pattern of femoratum; 
large, black mark at each spiracle; tergites 
8 and 9 suffused with red-brown; genitalia, 
fig. 332, light yellow, penis lobes with minute, 
lateral spines; caudal filaments entirely 
white. 
NympH.—Length of body 8-9 mm. Head 
light brown, anterior, dorsal margin of head 
without a median, white spot, or with such 
a spot only faintly indicated, triangular, 
white mark in front of anterior ocellus. 
Pronotum with a pair of large, sublateral, 
white spots at anterior margin, thoracic no- 
tum otherwise light brown except on median 
line and on sutures anterior to wing bases; 
legs brown, each femur with a basal, median, 
and apical, white crossband, each tibia white 
near base and at apex. Abdomen dorsally 
light brown, with a pair of narrow, discon- 
tinuous, submedian, white lines; gills 1-6 
pointed at apexes, seventh gill with a single 
trachea, venter of body white, lateral mar- 
gins of sternite 8 and lateral and apical mar- 
gins of 9 brown; caudal filaments white, 
alternating articulations faint brown. 
Known from Illinois and Ohio. 
Illinois Records. — Eppyvitite: Lusk 
Creek, June 6, 1946, Mohr & Burks, 3 ¢ ; 
Belle Smith Spring, June 7, 1946, Mohr & 
Burks, 16. GRraAyviILLeE: Wabash River, 
April 10, 1946, Mohr & Burks, 16, 4 N. 
3. Stenonema gildersleevei Traver 
Stenonema gildersleevei Traver (1935a:315). 
Mate.—Length of body 9-11 mm., of 
fore wing 10-12 mm. Head orange-tan, 
usually a continuous, black line crossing face 
below antennal bases; each antennal scape 
and pedicel white, flagellum gray-brown; 
Burks: THE MaAyrties or ILLINotIs 
163 
black markings on vertex between eyes. 
Thorax largely red-brown, pronotum mostly 
shaded with dark gray or black, dark 
shading along dorsal sutures of mesonotum 
and on mesoscutellum, metanotum black 
in median dorsal area; thoracic pleura with 
black shading below wing bases; sternum 
tan. All coxae light brown, the femora tan, 
with a median and an apical, dark brown 
crossband on each, tibiae yellow, tarsi tan, 
shaded with faint gray, first fore tarsal seg- 
ment one-half as long as second; wings hya- 
line, veins and crossveins red-brown, cross- 
veins below bulla usually connected by a 
black dash, stigmal area faintly stained with 
yellow, outer margin of hind wing shaded 
with light brown. Ground color of abdomen 
tan, overlaid with lavender-black shading: 
mid-dorsal line, posterior margin of each 
tergite, large sublateral area near posterior 
margin, and spiracular spot all dark shaded; 
on venter, mid-ventral line, anterior margin 
of each sternite, and, usually, a semitriangu- 
lar, sublateral spot at anterior margin of 
each sternite dark shaded; genitalia, fig. 333, 
with penis lobes and forceps tan or yellow- 
brown; caudal filaments light yellow, articu- 
lations near apexes slightly darker. 
NympH.—Length of body 11-13 mm. No 
pale spot on meson of anterior margin of 
head; gills borne by abdominal segments 1-6 
pointed at apexes, seventh pair slender, with 
a single, longitudinal trachea in each; ab- 
dominal tergites each with a pair of sub- 
median, longitudinal, light-colored streaks 
and a transverse, black crossband at pos- 
terior margin; abdominal venter white, with 
dark, longitudinal markings faintly indicated 
at lateral margins of sternites 7-9; caudal 
filaments yellow. 
Known from 
Ohio. 
Illinois Record.—KANKAKEE: at light, 
June 6, 1935, Ross & Mohr, 26. 
Illinois, New York, and 
4. Stenonema areion new species 
This species resembles interpunctatum in 
lacking spiracular dots on the abdomen and 
heterotarsale in lacking the oblique, black 
mark below the base of the fore wing on 
either pleuron; areion differs from both 
those species in having a bright Mars orange 
crossband at the posterior margin of each 
abdominal tergite, and in having the ground 
color of the abdomen white rather than yel- 
