LUCY WRIGHT SMITH 
481 
Wings with fine j ellow-brown venation, an irregular, scanty network in the 
tip between costa and the anterior branches of the radial sector; at least the 
first half of the costal area beyond the humeral cross-vein free from cross- 
veins; in the fore wing the length of the inner inter-radial cell twice as great 
as its base and cross-veins between media and cubitusi, and cubitusi and 
cubitus 2 , few (fig. 62). Without gills. 
Female. Abdomen dark brown above and below. Setae long, slender; the 
first few segments yellowish, the rest, ringed with darker toward the tips. The 
vulvar lamina large, reaching nearly to the posterior border of the ninth seg- 
ment, it is in the form of a wide truncate triangle with a broad, shallow, rounded 
notch in the tip (fig. 53). 
Type specimen, of unknown locality, in the collection of Acad- 
emy of Natural Sciences of Philadelphia. 
Male unknown. 
Nymph unknown. 
Arcynopteryx americana Klapdlek 
1912. Arcynopteryx americana Klapdlek, Coll. Selys, 4: 21. 
Adult 
Disirihution . — Colorado (Klapdlek), Wyoming. 
cf. — Length of body, 13 mm. (Klapd.lek). 
9 .—Length to tip of wings, 22 mm.; expanse of wings, 34 to 36 mm.; length 
of antennae, 12 mm.; length of setae, 11 mm. 
The following description of the coloration of the male is translated from 
Klapdlek : 
“In the male the entire occiput is ochre-yellow and this color extends in a 
narrow band along the inner margin of the eyes and joins in the middle the 
spot between the ocelli; the frons, with the exception of ochre-yellow tuber- 
cles and small yellow spots outside the posterior ocelli, is dark brown almost 
to the M line wliich is also ochre-yellow, then it passes again anteriorly into 
the dark anterior border of the clypeus. The under side of head is ochre- 
yellow. The middle field of the pronotum bright ochre-yellow, the sides brown, 
somewhat brighter toward the inside and darker outside. Meso- and meta- 
notum shining dark brown, the middle parts of the praescutum and scutellum 
ochre-yellow; on either side a lighter band extending from the praescutum to 
the base of the wings. Abdomen brown on the dorsum, the entire venter 
reddish yellow-brown. Antennae brown, paler on the under side, but the first 
segment dark brown; palpi brown, legs yellow-brown, the outer aspect of the 
femora with a dark line along the edge, tibiae beyond the knees, and the feet, 
brown. Setae yellow-brown, indistinctly ringed with darker and sparsely 
beset with whorls of strong, bristle-like hairs.” 
The female is chestnut brown with yellow markings, paler beneath. Head 
dark brown, tubercles and M-line yellow; lab rum and anterior corners of cl^y)- 
eus, whitish; posterior border of occiput broadly banded with yellow with 
a median extension running forward into the posterior half of the ocellar tri- 
angle; lateral occipital regions with a coarsely corrugated, oval-shaped spot just 
anterior to the yellow border. Antennae chestnut brown, a little over half the 
TRANS. AM. ENT. SOC., .XLIII. 
