484 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 113 
head capsule is very similar to that of cnvaria, but differs in that the 
apex of the frontoclypeus is rather blunt so that the frontal sutures 
meet at 90° or more, and the head is generally marked very darkly, 
appearing almost black to the naked eye. 
Description: Length, 16mm. Head, brownish yellow, marked with 
deep brown, both mesodorsally and ventrally; muscle scars pale, 
inconspicuous, head capsule slightly wider posteriorly; apex of fronto- 
clypeus blunt, frontal arms meeting at 90° or more (fig. 8,c); second 
segment of maxillary palpus twice length of first; left mandible with 
2 apical teeth, right with 3 apical teeth, mesal one longest (like fig. 
11,5). Thorax, pronotum yellow, with dark oval mark postero- 
mesally; fore femora much broadened. Abdomen, anal proleg with 
short basoventral and apicolateral processes, not free of membrane; 
claw with a second small ventral tooth (like fig. 8,6). 
Material examined: Virginia (Shenandoah National Park), White 
Oak Canyon, Mar. 29, 1957, 1 larva, 2 prepupae—Mar. 26, 1961, 1 
larva (USNM); Hogcamp Brook, Mar. 28, 1957, 6 larvae—Mar. 26, 
1961, 1 larva (USNM)—May 23, 1959, 1 prepupa, 2°? pupae— 
June 4, 1957, 5 prepupae, 3 o'@ pupae; Skyline Drive, Milepost 
71.5, Mar. 29, 1957, 2 larvae, 3 prepupae; Skyline Drive, Milepost 
79.5, May 238, 1959, 2 larvae, 2 o& pupae; near Waynesboro, 
Mar. 29, 1957, 1 larva; near Natural Bridge, Cave Mountain Lake 
Campground, Mar. 29, 1957, 1 prepupa, 1 pupa; near Sperryville, 
tributary of Thornton River, Mar. 9, 1961, 1 larva (USNM). 
Remarks: The larvae of this species seem to be the only ones of 
the genus in the small brooks and springs of the Shenandoah National 
Park. The larvae were not collected in brooklets more than a yard 
wide, and were often found in the leaf packets in the small springs. 
Adults were most commonly taken in June, but may be found 
from late May into July. Although the larvae were not collected 
in the fall, they probably do hatch before winter, inasmuch as the 
larvae are nearly full grown by early March. 
Rhyacophila nigrita Banks 
Figure 9,a 
Rhyacophila nigrita Banks, 1907, p. 132.—Betten, 1934, p. 132 (male genitalia). 
This species is known from New York, North Carolina, Tennessee, 
and Georgia and may be expected in the remainder of the Appalachian 
region. The male genitalia and the coloration of the larvae of the speci- 
mens from New York are slightly different from those of the southern 
mountains. It may well be that two closely related species are 
involved. 
Mature male metamorphotypes collected in Georgia, New York, 
and North Carolina form the basis for the association of the stages. 
