304 
Nympu.—General color yellow or yel- 
lowish brown with darker areas on head, 
thorax and abdomen, as in fig. 76. An- 
tennae, legs and anal cerci mostly yel- 
lowish. 
Head with three ocelli forming an al- 
most equilateral triangle, the lateral ocelli 
about as far apart as each is distant from 
inner edge of compound eye; no occipital 
ridge; basal segments of mouthparts con- 
spicuously extending far out laterally from 
the side of head so that head appears much 
broader than thorax. Labium, maxillae 
and mandibles as in fig. 77. 
Pronotum much broader than long; 
margins darkly bordered and central area 
light colored, rugosities very faint. 
Abdominal tergites mostly yellowish 
with dark transverse markings on anterior 
and posterior margins, fig. 76; tergites 
with scattered, short, stout setae. Cerci 
Fig. 76.—Nymph of Diploperla modesta. 
Intino1is NaturaL History SURVEY BULLETIN 
Vol. 22, Arte 
long, many segmented, segments progres- 
sively longer from base to apex, a longi- 
tudinal row of long, fine setae on dorsal 
Ge 
“S 
‘yO MANDIBLES ~ 
NyMPHAL LABIUM 
NYMPHAL ee ee: 
MAXILLA a 
Fig. 71.2 Diplepeea modesta. 
surface in addition to short, stout setae 
encircling apex of each segment. 
Approximately mature specimens with 
a body length, exclusive of appendages, of 
16 mm. 
A small nipple-like projection at each 
outer posterior corner of the submentum 
suggestive of an atrophied submental gill. 
Since there are only a few records of this 
species in the literature, I present the follow- 
ing. 
COLORADO. — PINGREE Park: Aug. 15-22, 
1924, Drake & Hottes, 19. Rocky MOUNTAIN 
NATIONAL Park, Fall River and Glacier Creek: 
Aug. 15-17, 1940, T. H. Frison & T. H. Frison, 
Jr., 26, 32 (reared), 1 nymph, exuviae. 
IpAHo.—VicTor, Moose Creek: Aug. 12, 
1940, T. H. Frison & T. H. Frison, Jr. 16, 
19, 4 exuviae. 
MonTANA.—SALTESE: July 9, 1936, H. H. 
Ross, 16 (reared). SILVER GATE, Soda Butte 
Creek: Aug. 2, 1940, T. H. Frison & Tame. 
Frison, Jr., 4 nymphs. 
OREGON. — WatLowa County, Lick Creek: 
Aug. 12, 1937, 19. BENTON COUNTY, Muddy 
Creek: April 12, 1938, S. G. Jewett, Jr. 1d. 
Urtau.—Locan Canyon: At light, July 29, 
1937, Knowlton & Harmston, 3¢, 39; Aug. 1, 
1937, Smith & Harmston, 14, 32; July 25, 
1938, Knowlton & Harmston, 54, 7 om 
W ASHINGTON.—CASHMERE, Wenatchee River. 
July 10, 1936, H! H. Ross, 16, 228 
Wyominc. — Panaska ‘TEPEE, north fork 
Shoshone River: July 29, 1940, T. H. Frisor 
& T. H. Frison, Jr., 1 exuvia. Near WAPIT 
north fork Shoshone River: July 30, 1940, T 
H. Frison & T. H. Frison, Jr., 16, 12 eee 
