470 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 113 
Description: Length, 13mm. Head, brownish yellow, irregularly in- 
fuscate posteriorly, with a conspicuous dark V-shaped mark posteriorly 
on the frontoclypeus; muscle scars dark, conspicuous (fig. 2,¢); second 
segment of maxillary palpus twice as long as first; mandibles edentate 
(fig. 2,2). Thorax, pronotum brownish yellow, slightly infuscate 
Ficure 2.—Rhyacophila torva: a, mandibles, dorsal aspect; b, anal proleg, lateral; c, head 
and pronotum, dorsal. 
mesally; muscle scars dark, conspicuous; fore femora slightly broad- 
ened. Abdomen, anal proleg with a basoventral hook; claw with 3 
ventral teeth (fig. 2,¢). 
Material examined: Massachusetts, Montague, Feb. 7, 1959, 1 
larva, 1 o& and 1 9 pupa. New York, Ithaca, Buttermilk Falls, 
May 3, 1956, 1 larva. North Carolina, Mount Mitchell, Camp Alice, 
Sept. 16, 1958, 1 prepupa; Great Smoky Mountains National Park, 
Couches Creek, July 2, 1958, 1 & pupa. 
Remarks: The larvae seem to be inhabitants primarily of tumbling 
brooks about 2—3 yards in width. 
The adults are often the first species of the genus on the wing. 
I have taken them as early as the first of April in Massachusetts; 
however, emergence evidently occurs over a considerable period of 
time for adults are taken well into July. The discovery of a prepupa 
in North Carolina in the fall indicates that a certain percentage of the 
population, which undoubtedly produces the early spring adults, 
