310 
somewhat broader than long, angles 
rounded, a distinct pattern of raised rugos- 
ities on surface each side of median, longi- 
—— 
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Fig. 83.—Diploperla arina. 
tudinal, yellow stripe, stripe narrower at 
anterior margin than at posterior margin, 
fig. 82. 
Legs with first and second tarsal seg- 
ments together about one-half as long as 
third, first tarsal segment slightly longer 
than second. 
Wings essentially hyaline with veins 
brown, venation variable as in fig. 83; 
slight suggestion of a brownish spot near 
inter-radial crossvein. 
Abdomen, fig. 82, with segments normal 
through ninth; tenth tergite cleft, the 
lobes formed by this cleft broad and cov- 
ered with numerous fine hairs and some 
small spinulae; inclosed within and _be- 
neath lobes is the supra-anal process, which 
is enveloped by two bulbous, weakly scle- 
rotized lobes which in turn surround the 
membranous area from which the supra- 
Intinois NaruraL History SURVEY BULLETIN 
Vol. 22, Art 
anal process arises; the supra-anal process 
is very long, slender and tapers to a point; 
no lateral stylets are present; seventh and 
eighth sternites without well-developed 
lobes on posterior margins. 
Length to tip of wings 21 mm.; length 
to tip of abdomen 17 mm. 
FEMALE.—Head, thorax, basal abdom- 
inal segments and appendages in general 
similar to those of male but slightly larger 
in size. Important differences are as fol- 
lows: eighth abdominal sternite, fig. 82, 
with subgenital plate broad and greatly 
produced so that it covers most of ninth 
sternite, posterior margin of plate in 
middle very slightly notched. 
Holotype, male.—Balsam, N. C., April 24, 
1938, H. H. Ross & B. D. Burks. 
Allotype, female——Same data as for holo- 
type. 
eipeepes — NortTH CAROLINA. — BALSAM: 
Same data as for holotype, 29. 
TEN NESSEE.—Greenbrier Cove, GREAT SMOKY 
Mountains NaTIONAL PARK: May 7, 1939, A. 
ConColeme lar 
Nympu. — General color yellowish 
brown with dark brown or fuscous areas 
on head, thorax and abdomen, as in fig. 84. 
Antennae, legs and anal cerci mostly yel- 
lowish brown. 
Head with three ocelli forming an al- 
most equilateral triangle, lateral ocelli 
about as far apart as each is distant from 
inner margin of adjacent compound eye; 
no complete occipital ridge, although there 
is an indication of such a ridge each side 
of head running to compound eye; basal 
segments of mouthparts conspicuously ex- 
tending out laterally from sides of head so 
that head appears much broader than pro- 
notum. Labium, maxillae and mandibles 
as in fig. 82; glossae and _paraglossae 
terminating in a small nipple-like struc- 
ture. 
Pronotum broader than long, corners 
rounded, fig. 84. 
Abdominal tergites basically yellow 
with narrow, dark brown or fuscous trans- 
verse bands on anterior and posterior mat- 
gins of tergites, fig. 84. Cerci long, many 
segmented, segments progressively longer 
from base to apex; a longitudinal row of 
long, fine setae on dorsal surface in addi- 
tion to smaller spinelike ones encircling 
apex of each segment. 
Mature specimens with a body length, 
exclusive of appendages, of 19 mm. 
A minute, nipple-like projection at each 
