18 
Psyche 
[March 
from both in details of the genitalia, fig. 27. 
Hydropsyche oslari Banks, 1905b, p. 13, fig. 2. 
Lectotype, male . — South West Colorado, July 23, 1899. 
No. 11501. Lectoallotype, female . — Same, but July 17. 
The long, apical segment of the claspers and the short, 
approximate apical processes of the tenth tergite are diag- 
nostic for this species, fig. 35. 
Hydropsyche partita Banks, 1914, p. 252, figs. 58, 59. 
Lectotype, male . — Switzers Camp, San Gabriel Mts., 
California, June. No. 11498. 
This is a synonym of oslari. 
Hydropsyche phalerata Hagen, 1861, p. 287. 
Allotype, male. — Great Falls, Virginia, July 27. 
The great similarity between the pinned lectotype and this 
allotype leaves no doubt of the correct association of the 
two. The upturned apex of the tenth tergite and the 
slightly enlarged apex of the sedeagus are diagnostic, fig. 25. 
Hydropsyche recurvata Banks, 1914, p. 253, fig. 73. ( H . 
slossonse var.) 
Lectotype, male . — Go Home Bay, Ontario, Split Rock, 
June 9, E. M. Walker. No. 11507. 
This species is distinguished by the combination of a long, 
curved spur at the end of the lateral process of the sedeagus 
and the apex of the sedeagus being developed into a pair of 
large, lateral lobes. The species codona Betten (1934, pi. 18, 
figs. 10-12) is a synonym of recurvata. 
Hydropsyche slossonse Banks, 1905b, p. 14, figs. 4, 7. 
Lectotype, male . — Franconia, New Hampshire. No. 
11495. Lectoallotype, female . — Same data. 
In general appearance this species resembles other mem- 
bers of the “alternans” group, but is distinguished from all 
others by the male genitalia, fig. 30. Diagnostic characters 
include : simple, spine-like spur on end of lateral process of 
sedeagus, three large pockets of spines within apex of 
sedeagus, and long, excavated processes of tenth tergite 
which form an apical horseshoe. 
Hydropsyche sordida Hagen. — see Cheumatopsyche sordida 
(Hagen) 
