[March 
10 Psyche 
to a short “cross-vein”, and Ml-2 fused for a short distance 
with Rs. 
Genotype. — Orthotrichia nigritta Banks (by original 
designation) . 
This genus keys out with Stactobia but differs from it in 
the position of Cu & Cu2, the shortening of Rl, and in other 
characters. 
Orthotrichia pallida Banks. — see Oxyethira pallida (Banks) 
Orthotrichia pictipes Banks. — see Stactobia pictipes 
(Banks) 
Oxyethira dorsalis Banks, 1904d, p. 216, pi. 2, fig. 5. 
Lectotype, female. — Falls Church, Virginia, June 26, No. 
11600. 
That portion of the type series which corresponds to the 
original description, especially in having the characteristic 
white line down the dorsum, contains only female specimens. 
Until the females and males of more species in the genus 
have been associated nothing can be done to settle the specific 
identity of this species. 
Oxyethira pallida (Banks), 1904d, p. 215, pi. 2, figs. 2, 7. 
Lectotype, male. — Washington, D. C. No. 11599. Lecto- 
allotype, female. — Same data. 
This species is the same as viminalis Morton, which now 
becomes a synonym of pallida. 
Polytrichia tarsalis (Hagen), 1861, p. 275. (Hydroptila) 
Lectotype, male. — St. Lawrence River, Canada, Osten 
Sacken. No. 11104. 
This species has been illustrated by Betten (1934, pi. 12, 
figs. 11-14) under the name confusa Morton. Morton’s 
species is not this one, but according to original figures be- 
longs to another section of the genus. 
Stactobia pictipes (Banks), 1911, p. 359. 
Lectotype, male. — Johnstown, New York, June 28, Hale’s 
Creek. No. 11597. Lectoallotype, female. — Same data. 
The spur of the front tibiae put this species in the hetero- 
geneous Stactobia. The male genitalia are illustrated in 
fig. 12. They are strikingly different from any other 
Nearctic species. 
