212 
Psyche 
[Vol. 93 
Additional Paratypes. CALIFORNIA: El Dorado Co., Tahoe Par- 
adise, 5-13 August 1985, 4 <3, W. H. Tyson, DGD; 1 mi. SW Meyers, 
13 July 1984, 1$, W. H. Tyson, DGD. Madera Co., Red’s Meadow, 
16 August 1941, 3 S 19, M. V. Hood, LACM; Nelder Cr. Camp, 
4600 ft., 25 August 1973, 19, W. H. Tyson, USNM; Central Camp, 
5500 ft., 30 July 1983, 3<J, J. Larson, DGD. Siskiyou Co., Shadow 
Cr., 7 mi. E Cecilville, 5 September 1968, 19, USNM. Tulare Co., 
Salmon Cr. at Horsemeadow Campground, Sequoia National 
Forest, 31 July 1965, 2$, W. P. Vann, DGD; Johnsondale, 
Aug. -Sept. 1985, many $$ 99, uvl, D. J. Burdick, CAS, DJB, 
USNM, ROM. 
From extensive u.v.l. collections made by D. J. Burdick, we have 
been able to examine long series of adults of O. sequoiae. There is 
no evidence of intergradation between O. sequoiae and O. unicolor, 
and both species were represented in two of the series examined: 
Madera Co., Lewis Cr., 16-22 September 1983; El Dorado Co., 1 
mi. SW Meyers, 30 August 1984 (specimens in collection of D. J. 
Burdick). In two male specimens of O. unicolor from Fresno Co. 
(Friant) the inferior branch of segment X was an angulate vertical 
plate, but not the flattened tongue of O. sequoiae; and the para- 
meres of these specimens were typical of O. unicolor. 
Range and Habitat. Adults of this species have been collected 
in the vicinity of streams mainly in the Sierra Nevada Mountains of 
California in El Dorado, Inyo, Madera, Plumas, Shasta, Siskiyou, 
and Tulare Counties (Fig. 14). In the absence of information on 
larvae of O. sequoiae, any difference in habitat between the two 
species remains unknown. 
Variation. Another form, provisionally considered a variant of 
O. sequoiae, has been found in collections from Shasta County 
(Castle Cr., approx. 3 mi. w. Hwy. 1-5, 9 August 1985, 18(5 79, uvl, 
ROM; Indian Cr., Castle Crags State Park, 9 August 1985, 1<J, uvl, 
ROM; Hat Cr., 25 June 1947, 1$, CAS) and Plumas County 
(Thompson Cr., 0.6 mi. above Thompson Meadows, s.w. Quincy, 
16-17 July 1985, 1<5, uvl, ROM). These specimens are larger than 
most O. unicolor and typical O. sequoiae (length of fore wing: $ 
21-22 mm; 923 mm), but the principal difference is in the parameres 
of the males (Fig. 12) where the proximal spine is a long, stout 
straight process with a cluster of short denticles at the apex. The 
distal spines on the parameres are reduced in size and nearly 
