May, 1953 
pink or orange-brown, area of pleuron ven- 
tral to fore wing base light yellow; thoracic 
sternum pale yellow, anterior end of meso- 
basisternum shaded with testaceous; coxae 
of all legs shaded with light Mars orange, 
apical segment of tarsus of each leg gray; 
fore leg light tan, middle and apex of femur 
shaded with red-brown, apex of tibia and 
apexes of tarsal segments dark brown, first 
tarsal segment one-half as long as second; 
middle and hind legs light yellow, apex of 
hind femur and middle and apex of middle 
femur shaded with red-brown; wings hya- 
line, humeral cell of fore wing shaded with 
light brown, proximal part of stigmatic area 
faintly stained with brown, veins of fore 
wing yellow-brown, crossveins dark brown, 
anterior veins and crossveins of hind wing 
pale yellow, more posterior ones hyaline. 
Abdomen pale yellow or white, each tergite 
2-7 with a medianly interrupted, narrow, 
black crossline at posterior margin and, in 
addition, a fairly broad, Mars orange cross- 
band at posterior margin of each tergite 1-7; 
spiracular markings absent; apical three ter- 
gites Mars orange, shading to chrome orange 
at apex of tergite 10, these tergites some- 
times also with a pink suffusion; genitalia, 
fig. 343, white; caudal filaments white, basal 
articulations Mars orange, more distal ar- 
ticulations white. 
NympuH.—Length of body 10 mm. Head 
light brown in area anterior to compound 
eyes and on vertex, this dark area freckled 
with numerous, relatively large, white dots; 
three large, white spots on lateral margin 
near each compound eye; median, white spot 
anterior to median ocellus and on vertex near 
posterior margin; base of each antennal 
flagellum dark; rest of antenna white. Pro- 
notum light brown, with many irregular, 
white spots; each tibia with a basal and a 
median, brown band; each tarsus brown ex- 
cept at base and apex; tarsal claws without 
ventral denticles. Abdominal tergites 1 and 
2 white, 3—5 mostly white, each with a longi- 
tudinal, median, brown mark on basal half, 
a brown spot at posterolateral angle, and a 
pair of large, submedian, vague, light brown 
spots at posterior margin; tergites 6-8 
mostly brown, a pair of small, anterolateral 
and submedian, white marks at anterior mar- 
gin of each; tergite 9 brown on meson and 
near lateral margins; and 10 brown except 
for two submedian, basal spots; sternites 1-8 
white, 9 with vague, lateral and basal, brown 
Burks: THE Mayr tiers oF ILLINOIS 171 
markings; posterolateral angles of segments 
7-9 spinelike; gills borne by segments 1-6 
truncate at apexes, seventh pair without 
tracheae; caudal filaments light yellow, api- 
cal articulations slightly darkened with tan. 
Holotype, male.—Rockford, Illinois, at 
light, June 11, 1948, Burks, Stannard, & 
Smith. Specimen dry, on pin. 
Paratypes.—ILLINoIs: Same data as for 
holotype, 18¢. Drxon: at light, June 25, 
1947, B. D. Burks, 5¢. ELizaBerHtown: 
at light, July 14, 1948, Mills & Ross, 1¢. 
FREEPORT: at light, June 10-11, 1948, Burks, 
Stannard, & Smith, 116; Aug. 4, 1948, 
Burks & Stannard, 26. GREENVILLE: Shoal 
Creek, April 12, 1946, Mohr & Burks, 13. 
OrecoN: July 4, 1946, Burks & Sanderson, 
Soi; July 9, 1925, T) He Frison, 13° Aug: 
5, 1948, Burks & Stannard, 4¢. Pirts- 
FIELD: at light, Aug. 11, 1948, Sanderson 
& Stannard, 34. PropHETsTowNn: at light, 
June 25, 1947, B. D. Burks, 1 6 ; July 24-25, 
1947, Burks & Sanderson, 103. Rockton: 
June 25, 1947, B. D. Burks, 174 ; Aug. 4, 
1948, Burks & Stannard, 66. RoscoE: June 
25, 1947, B. D. Burks, 46. SHAWNEETOWN: 
July 14, 1948, Mills & Ross, 2¢. STERLING: 
at light, June 26, 1947, B. D. Burks, 5¢. 
URBANA: at light, May 29, 1947, H. H. 
Ross, 1 ¢. All specimens dry, on pins; geni- 
talia on microscope slides. 
Additional Illinois specimens preserved in 
alcohol, and not included in the type series, 
are from the following: Atton: May 18, 
1932, Ross & Mohr, 1 ¢. Brtterr: Wabash 
River, May 15, 1942, Mohr & Burks, 4¢. 
Rockrorp: May 22, 1941, Ross & Burks, 
31. Srertinc: May 22, 1941, Ross & 
Burks, 23 ¢. 
VICARIUM Group 
14. Stenonema pudicum (Hagen) 
Ephemera pudica Hagen (1861:39). 
Eaton (1885:280) placed this species as a 
synonym of vicarium, but McDunnough 
(19254:191) studied the type and was able 
to show that pudicum was not synonymous 
with vicarium. The type specimen is a fe- 
male subimago in poor condition, now in the 
collection of the Museum of Comparative 
Zoology. I have studied it and agree with 
McDunnough. 
Mate.—Length of body 10-12 mm., of 
fore wing 12-14 mm. Head brown, usually 
