192 Intinois NATURAL History SurvEY BULLETIN 
1¢,92,5 N. Oaxwoop: Salt Fork River, 
June 6, 1925, T. H. Frison, 66, 12 ; June 
14, 1930, T. H. Frison, 2¢ ; Camp Drake, 
June 24, 1948, Mills & Ross, 1 ¢. Quincy: 
Mississippi River, June 7, 1939, Burks & 
Riegel, 1 2 ; June 8, 1939, T. E. Musselman, 
1¢. Urpana: at light, July 29, 1947, L. 
J. Stannard, 19; July 5, 1907, 19. Wi- 
MINGTON: at light, Aug. 6, 1947, Burks & 
Sanderson, 5 @. 
14. Heptagenia maculipennis Walsh 
Heptagenia maculipennis Walsh (1863:206). 
The male lectotype of this species is in 
the Museum of Comparative Zoology. It 
is badly broken, but the remaining frag- 
ments indicate that the present concept of 
the species is correct. 
Mare.—Length of body 4.5-6.0 mm., of 
fore wing 6.5-8.0 mm. Head yellow; vertex 
stained with red-brown and having a brown 
stripe at posterior margin; compound eyes 
greenish gray, with a brown stripe across 
middle of each, eyes separated on meson by 
a space almost twice as wide as a lateral 
ocellus. Thorax cream colored, almost 
white, with a longitudinal, mesal, brown 
stripe on mesonotum; a dark brown stripe 
on each pleuron extending from mesocoxa 
to pronotum and a lighter brown stripe ex- 
tending ventrally from fore wing base to 
sternum. Legs pale yellow to white, fore 
femur yellow, ventral side with a_ black 
mark at apex, apexes of fore tibia and fore 
tarsal segments shaded with gray; first fore 
tarsal segment one-sixth to one-fifth as long 
as second segment; wings hyaline, anterior 
veins of fore wing tan, all crossveins brown, 
those in costal and subcostal interspaces sur- 
rounded by brown clouds, fig. 318; posterior 
veins of fore wing and all veins and cross- 
veins of hind wing colorless. Abdomen 
white, with tergites 7-9 and basal half of 
10 shaded with bright orange- or red-brown; 
genitalia, fig. 376, white; caudal filaments 
white. 
FEMALE.—Length of body 5.0-6.5 mm., of 
fore wing 7.0-8.5 mm. Head as in male. 
Thorax much as in male except that brown 
shading is reduced in area, the longitudinal, 
mesal, brown shading of mesonotum is 
usually confined to anterior half of sclerite; 
legs as in male, but fore tibia and tarsus 
with no dark shading; wings hyaline, all 
veins colorless, anterior crossveins of fore 
Vol. 26, Art. 1 
wing brown. Entire abdomen light yellow 
to white; posterior margin of terminal ab- 
dominal sternite produced on meson, evenly 
rounded; caudal filaments white. 
NympeH.—Length of body 5.0-6.5 mm. 
Head wider than pronotum, anterior, dorsal 
portion gray-brown, freckled with dark 
spots, three white spots on either margin 
just anterior to compound eye, three large, 
round, white spots on vertex between eyes. 
Thoracic notum gray-brown, with numerous 
white spots; each tarsal claw with a small, 
acute basal tooth and four or five ventral 
denticles. Abdomen dorsally gray-brown, 
with large, white markings; tergite 1 al- 
most entirely white; tergites 2, 3, and 6 
each with a pair of submedian, white streaks, 
a pair of posterior, white triangles, and a 
pair of lateral triangles; tergites 4 and 5 
each with a large, median, white area, a pair 
of posterior triangles, and a pair of lateral 
triangles; tergites 7 and 8 with a confluent, 
median, white blotch, and each with a pair 
of posterior and a pair of lateral triangles; 
tergite 9 brown on posterior two-thirds, 
white anteriorly, three marginal, white dots 
in brown portion; tergite 10 brown, with a 
pair of large, submedian, white marks; 
sternites entirely white; gills borne by 
seventh segment lacking ventral, filamentous 
tufts; caudal filaments white, articulations 
brown, these latter alternately of lighter and 
darker tones. 
Known from Illinois, Manitoba, Missouri, 
Ohio, Ontario, and Tennessee. 
Illinois Records.—Specimens, collected 
June 3 to September 8, are from Antioch, 
Aurora, Beardstown, Dixon, Effingham, 
Elizabethtown, Hardin, Harrisburg, Ha- 
vana, Homer, Hoopeston, Illini State Park — 
(La Salle County), Kankakee, Lewistown, — 
Mahomet, Momence, Monmouth, Monti- 
cello, Mount Carmel, Muncie, Oakwood, — 
Oregon, Ottawa, Pontiac, Prophetstown, 
Quincy, Rockford, Rock Island, Rockton, 
Rossville, St. Charles, Shawneetown, Shelby- 
ville, South Beloit, Sterling, Urbana, Wau- 
kegan, and Wilmington. 
15. Heptagenia wa!lshi McDunnough 
Heptagenia walshi McDunnough (1926:193). 
Mave.—Length of body and of fore wing 
6 mm. Head brown, a light tan or yellow 
crossband just below antennae; compound 
eyes separated by a space almost as wide 
