ILtinois NaturAt History Survey BULLETIN 
Penis lobes each with a large, decurrent 
appendage, fig. 207........ 6. ontario 
Penis lobes without decurrent appendages, 
ES.) Rea RON AMR rE ote . mollis 
ae. DOG 0a Bis x6 oii var. 8 see er a 
Penis lobes without apicolateral projec- 
tions; decurrent appendages slender, 
bifid at apexes, fig. 209... . .8. volitans 
Penis lobes with apicolateral projections; 
decurrent appendages not bifid at 
PRR: Css PK as Ve : Re ston ae 8 
Abdominal tergites 2-7 white, with 
spiracular dots; mesal apical angles of 
penis lobes divergent, fig. 210........ 
yi aR ee Re Rone 9. guttata 
tergites 2-7 white, with 
spiracular dots and a large, brown spot 
near each posterolateral angle; mesal 
apical angles of penis lobes convergent, 
TTP.) BI PAS he aR 10. strigula 
Marure Nympus 
Gills borne by abdominal segments 3-5 
dividing into two branches at a point 
at least one-third the distance from 
base to apex of gill; tracheae of these 
gills with numerous, prominent, lateral 
NEANCUPS Lite OF eis ee Roch ek ae 2 
Gills borne by abdominal segments 3-5 
divided into two branches at a point 
not more than one-sixth the distance 
from base to apex of gill; tracheae of 
these gills with only a few, minute, 
lateral branches:2.. «22 etree. oe Fa 3 
Anterior margin of labrum slightly in- 
dented on meson; each gill of abdominal 
segments 3—5 divided at a point about 
one-third distance from base to apex 
°c) HOS [1 OA aaa Me en Re 7. mollis 
Anterior margin of labrum not indented 
on meson; each gill of abdominal seg- 
ments 3-5 divided at a point about one- 
half distance from base to apex of gill 
Pe nha too Sidare, Rotates 5. adoptiva 
Abdominal venter with a pair of longi- 
tudinal, sublateral brown bands...... 
AeA adete yi ett se earns 8 3. praepedita 
Abdominal venter without  sublateral 
ANOS EE Mee la iain wey Ohl he es 4 
Only abdominal segment 9 with postero- 
lateral angles produced as spines... .5 
Both abdominal segments 8 and 9 with 
posterolateral angles produced as spines 
Abdominal segments 2-6 each with a 
black streak along either lateral margin 
PER ot sea op rang Ca aaee 10. strigula 
Abdominal segments 2-6 with only a 
small, black spot near base of each gill 
Pe GE ha esate Madi ones 9. guttata 
Gills borne by abdominal segments 3-5 
with long, sparse, marginal hair...... 
NES Peres = ee | eee 8. volitans 
Gills without marginal hair........... 7 
Tibiae light yellow, with brown band in 
middle and at base of each.......... 
Bea Neto 0 as «ec Rc cx 1. debilis 
Tibiae light yellow or tan, with brown 
shading at bases only.............. 8 
Vol. 26, Art. 1 
8. Combined length of second and third seg- 
ments of maxillary palp one and one- 
half times as great as length of first 
BCSMONE... cfd 3 ie ee 6. ontario 
Combined length of second and third 
segments of maxillary palp equal to 
length of first segment. ...2. moerens 
1. Paraleptophlebia debilis (Walker) 
Baetis debilis Walker (1853:569). 
Leptophlebia mollis Needham (1908:189), 
not Eaton. Misidentification. 
Leptophlebia separata Ulmer 
(1920a:27; 1921:255). 
Mace.—Length of body and of fore wing 
8-9 mm. Head, thorax, and apex of abdomen 
dark brown, abdominal segments 2—7 white, 
with transverse, brown lines at posterior 
margins of tergites; wings hyaline, with tan 
longitudinal veins and colorless crossveins; 
genital forceps, fig. 201, a faint tan, with 
penis lobes slightly darker; caudal filaments 
white. 
Known from the northern states and the 
southern part of Canada. 
2. Paraleptophlebia moerens 
(McDunnough) 
Leptophlebia moerens McDunnough 
(1924b:94). 
Mave.—Length of body and of fore wing 
5.5-6.5 mm. Head dark brown, almost 
black; eyes in life brown; antennae dark 
brown, each becoming hyaline at apex of 
flagellum. Thorax dark brown; fore leg 
light brown, with femur and tibia shaded 
with dark brown; middle and hind legs light 
brown, with coxae dark brown, femora 
and tibiae shaded with dark brown, and 
tarsi white; wings hyaline, with faint brown 
staining at base of fore wing, veins and cross- 
veins colorless. First abdominal segment 
dark brown; second tergite shaded with light 
brown, with dark brown crossband at pos- 
terior margin; tergites 3-6 white, with dark 
brown crossband at posterior margin of 
each; apical three segments chestnut brown; 
sternites 2-6 white, with large, median, 
orange-tan spot on each; forceps base brown, 
forceps, fig. 203, tan, penis lobes yellow- 
brown; caudal filaments white. 
FEMALE.—Length of body and of fore 
wing 7 mm. Head and thorax red-brown, 
lighter than in male; legs light brown, with 
dark brown shading at base of each tibia; 
wings very faintly stained with tan, and 
.) 
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