488 PROCEEDINGS OF THE NATIONAL MUSEUM VoL. 113 
second segment of maxillary palpus twice as long as first; left mandi- 
ble with 2 apical teeth, right with 3 apical teeth, mesal one longest. 
Thorax, pronotum golden brown, immaculate; fore femora much 
broadened. Abdomen, anal prolegs with basoventral and apical- 
lateral processes, but not free of membrane; claw with 2 ventral 
teeth. 
Material examined: North Carolina, Mount Mitchell, Camp 
Alice, Sept. 1, 3, 1959, 3 larvae—Sept. 16, 1958, 2 larvae; Mount 
Mitchell, Sept. 1, 1959, 1 larva; Blue Ridge Parkway, Crabtree 
Meadows Campground, Sept. 2, 1959, 1 larva; Great Smoky Moun- 
tains National Park, Indian Gap, July 4, 1958, 1 larva. 
Remarks: The larvae were collected in tumbling mountain brooks, 
generally less than 2 yards in width. 
Because pupae or prepupae of this species were not collected, the 
flight period cannot be given. The adults of mycta have been recorded 
from late May through June. 
Rhyacophila carolina group 
This group of five species, all closely related on the basis of male 
genitalia, shows a very uniform structure in the larval stage. To 
date, larvae of kiamichi Ross, fenestra Ross, and ledra Ross have been 
reared. In addition, another larval form, almost certainly the larva 
of carolina Banks, is present in material I have collected along the 
length of the eastern mountains. J have not had any larvae of ledra 
to study, but Ross (1944) was unable to separate larvae of this species 
from those of fenestra. 
The larvae of this group have the following characters in common: 
Head short, only shghtly longer than broad, much widened pos- 
teriorly; second segment of maxillary palpus about twice as long as 
first; left mandible with 2 apical teeth, right with 3 apical teeth, 
of which the middle is the longest; anal prolegs with neither baso- 
ventral hook nor apicolateral spur, claw without ventral teeth. 
Rhyacophila ledra Ross 
Rhyacophila ledra Ross, 1939, p. 65 (male genitalia). Ross, 1944, p. 37 (male 
genitalia, larva). 
R. ledra has been recorded from Georgia, Illinois, Ohio, and Ten- 
nessee. In 1944 Ross indicated that in the basis of the material 
available he could not separate the larvae of ledra and fenestra. 
I have seen no larvae definitely of this species, but there is a series 
of larvae (USNM) from Vienna, Va., with the fenestra-type coloration 
that may well be ledra. The head pattern in these is much fainter; 
because this faintness could easily be due to age and fading, no at- 
tempt is made to separate the species at this time. 
