174 
notum dark red-brown, thoracic pleuron 
mostly yellow-brown, with darker shading 
at wing bases and dorsal to coxae; thoracic 
venter red-brown; stigmatic area of fore 
wing washed with yellow-brown, crossveins 
usually not crowded in region of bulla; first 
fore tarsal segment about one-half as long 
as second segment. Abdominal tergites 1-7 
almost entirely dark brown, each tergite 
slightly lighter only near anterior margin; 
apical tergites uniformly dark yellow-brown, 
often with an added reddish suffusion; geni- 
talia, fig. 347, yellow; the three well-de- 
veloped caudal filaments gray-yellow, with 
articulations brown. 
Nympu. — Length of body 10-11 mm. 
Tarsal claws without ventral denticles. Gills 
borne by abdominal segments 1-6 truncate 
at apexes, posterolateral angles spinelike on 
segments 6— or 7-9; tergites 6 and 8-10 
mostly brown, the others mostly light; mid- 
dle and apical sternites each with a me- 
dianly sinuate, transverse, brown band cross- 
ing middle of sternite; the three caudal fila- 
ments usually uniformly yellow, with the 
apical segments sometimes alternately dark 
and light. 
Known from Georgia, Michigan, New 
York, North Carolina, Ohio, Quebec, South 
Carolina, Tennessee, and West Virginia. 
MEDIOPUNCTATUM Group 
18. Stenonema mediopunctatum 
(McDunnough) 
Ecdyonurus mediopunctatus McDunnough 
(1926:191). 
Mave.—Length of body 9 mm., of fore 
wing 10 mm. Face below antennal bases 
white, vertex sepia brown. Dorsum of 
thorax entirely blackish brown, except that 
apex of mesoscutellum is light brown; tho- 
racic pleura very dark brown, each with 
small, white areas at wing bases; thoracic 
sternum dark brown; first fore tarsal seg- 
ment two-thirds as long as second segment, 
each femur with a median and an apical, 
red crossband. Abdominal segments white, 
with a small, black spot on meson of pos- 
terior margin of each of tergites 2-8, black 
spiracular dots usually present on segments 
4-7, apical three tergites shaded with 
brown; caudal filaments entirely white. 
Known from Ontario. 
Ittinois NarurAt History SurvEY BULLETIN 
Vol. 26, Art. 1 
19. Stenonema metriotes new species 
This species resembles mediopunctatum 
in having the markings at the posterior mar- 
gins of abdominal tergites 2—7 reduced to 
very short, median dashes; the two differ in 
that the mesonotum is dark brown in medio- 
punctatum, while it is white in metriotes; 
in mediopunctatum, usually the spiracular 
dots on the abdomen and the articulations 
of the caudal filaments are not darkened, 
but, in metriotes, the spiracular dots always 
are wanting and the articulations of the 
caudal filaments are red-brown. S. metriotes 
may eventually prove to be only a variant of 
integrum, although the abdominal markings 
characteristic of integrum are wanting in 
this species. 
Mave.—Length of body 5-6 mm., of fore 
wing 7-8 mm. Face below antennal sockets 
white; vertex flesh colored, with a pair of 
short, oblique, submedian, tan streaks be- 
tween eyes; eyes in life white; each antenna 
white, flagellum slightly grayed near base. 
Mesonotum chalky white, a pair of faint, 
tan marks near posterior ends of outer 
parapsides; pleuron white, a very faint, tan, 
oblique streak ventral to each wing base; 
venter of thorax white; fore coxa shaded 
with tan, fore femur tan, with middle and 
apex red-brown, tibia white, with brown or 
tan shading at base and apex; apexes of 
tarsal segments tan, first tarsal segment 
three-fifths to two-thirds as long as second 
segment; middle and hind legs white, apexes 
of femora shaded with red-brown; wings 
hyaline, stigmatic area of fore wing stained 
with tan, anterior veins yellow-brown, cross- 
veins dark brown, posterior veins of fore 
wing and all veins and crossveins of hind 
wing hyaline, outer margin of hind wing 
shaded with brown. Abdomen white, ter- 
gites 2-6 each with a minute, black, median 
dash at posterior margin, tergites 7 and 8 
each with a medianly interrupted, black 
crossline at posterior margin, tergite 9 with 
a continuous, black crossline at posterior 
margin, tergites 8 and 9 shaded with tan 
on meson; spiracular markings absent on 
abdomen; genitalia, fig. 348, white; caudal 
filaments white, articulations red-brown. 
Holotype, male. — East Dubuque, IIli- 
nois, at light, July 3, 1946, Burks & Sander- 
son. Specimen dry, on pin. 
Paratypes. — ILLINoIs: Data same as for 
holotype, 3¢. Orecon: July 4, 1946, Burks 
