138 IuLrNois NatrurAL History Survey BULLETIN 
legs white, with coxae shaded with brown, 
a minute red-orange or red-brown mark at 
apex of each trochanter, each femur stained 
with orange-red or tan in middle and at 
apex, and each tibia stained with same color 
at apex; wings hyaline, with brown spot at 
base of each extending from vein Sc to 1A. 
First abdominal tergite brown, tergites 2-6 
white, often very faintly stained with tan, 
apical tergites brown; black spiracular dots 
and, usually, longitudinal lines present on 
tergites 2-6 or —7, each spiracular dot almost 
always white in center; abdominal venter 
with first sternite variably stained with tan, 
sternites 2-6 white, apical ones stained with 
tan of varying intensity; genitalia with first 
forceps segment tan, other segments white, 
apical forceps segment two to two and one- 
half times as long as broad; the two cerci 
white. 
NympH.—Length of body 45 mm. Head 
and thorax mottled brown and white; legs 
white, with brown shading in middle and at 
apex of each femur. Dorsum of abdomen 
with strongly contrasting areas of brown 
and white: first and second tergites mostly 
brown, with white spot at each posterolat- 
eral angle; tergites 3 and 4 white, usually 
with a pair of submedian dots on each ter- 
gite, lateral margins brown; tergite 5 with 
broad middle area white, the lateral areas 
brown; tergites 6 and 7 almost entirely 
brown, usually with a pair of submedian, 
white dots at the posterior margin of each; 
tergite 8 marked like tergite 4; tergite 9 
with a pair of large, brown, lateral spots; 
basal abdominal sternites white, apical ones 
shaded with brown, in some specimens each 
sternite bearing a pair of submedian dots; 
gills with tracheae obscure, almost invisible ; 
caudal filaments white, with a broad, brown 
crossband at middle of each. 
Known from Illinois, Ontario, and New 
York. 
Illinois Records.—AromaA Park: Kan- 
kakee River, June 4, 1947, B. D. Burks, 12. 
Baker: Indian Creek, May 12, 1938, Ross 
& Burks, 2 N. Eppyvitte: Lusk Creek, 
May 28, 1946, Mohr & Burks, 1. Mazon: 
Mazon Creek, May 16, 1938, Ross & Burks, 
10 N. Muncie: May 13, 1941, H. H. Ross, 
14. Oakwoop, Salt Fork River: May 2, 
1943, H. H. Ross, 52 ; May 6, 1936, Ross 
& Mohr, 60 N. Rock Istann: 184, 249 
(Walsh 1862:380). SerENA, Indian Creek: 
May 12, 1938, Ross & Burks, 2 N; May 16, 
Vol. 26, Art. 1 
1938, B. D. Burks, 2 N. Warson: April 
23, 1932, Ross & Mohr, 1 N. Wor Lake, 
Hutchins Creek: May 12, 1939, Burks & 
Riegel, 2 N; May 15, 1940, Mohr & Burks, 
3 N. 
3. Pseudocloeon parvulum McDunnough 
Pseudocloeon parvulum McDunnough 
(19325: 210). 
Mave.—Length of body 3.0-3.5 mm., of 
fore wing 3.5-4.0 mm. Head dark brown; 
antennae brown, apex of each flagellum 
slightly lighter. Thorax dark brown; legs 
light yellow, with coxae brown, each fore 
femur uniformly shaded with smoky tan, 
and middle and hind femora with red shad- 
ing near apexes and on ventral margins; 
wings hyaline, longitudinal veins faintly 
stained with tan, vein Sc with dark tan spot 
at base. First abdominal tergite tan, ter- 
gites 2-6 white, very faintly suffused with 
tan, each with a pair of large, red spots and 
black spiracular lines at lateral margin; 
apical tergites dark tan; first abdominal 
sternite suffused with tan, sternites 2-6 
lighter, almost white, no ventral markings 
present, apical sternites same color as basal 
one; genitalia white, with first segment of 
forceps suffused with tan, apical forceps 
segment only slightly longer than broad; 
cerci white or light yellow. 
FEMALE.—Length of body 3-4 mm., of 
fore wing 3.5-4.5 mm. Head and entire 
body tan or light brown, with abdominal 
sternites slightly lighter in color; red shad- 
ing of abdominal tergites sometimes visible; 
wings tan at bases, wing veins faintly yel- 
low; cerci white or faintly yellow. 
NympH.—Length of body 4.0-4.5 mm. 
Head and body brown, without large, con- 
trastingly colored areas on dorsum of abdo- 
men; legs each with femur brown on basal 
half to two-thirds, tibia brown at apex, 
tarsus brown in apical half; abdominal ter- 
gites typically each with a median anterior, 
two submedian, and a pair of posterolat- 
eral, light colored spots; gills platelike, each 
with a subapical, brown spot and_ black 
tracheae, the latter usually with a single 
stem and only one lateral branch; caudal 
filaments with narrow, alternating brown 
and white crossbands from base to apex of 
each. 
Known from Alberta, Illinois, Quebec, 
and Ontario. 
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