LUCY WRIGHT SMITH 
477 
Female. Abdomen uniformly dark brown; basal segments of the setae 
brown, the following ones alternately ringed with white and brown, each seg- 
ment being marked with a narrow, basal, ring of white followed by first a 
narrow browm, then a narrow white band and finally a broad, brown, terminal 
ring. Vulvar lamina trapezoidal with a broad, shallow, V-shaped, apical notch 
(fig. 48). 
One female specimen from Old Forge, New York, VIII, IG, 
1905, (J. G. Needham), in the collection at Cornell University, 
Ithaca, N. Y., is the type of this species. 
Male unknown. 
Nymph unknown. 
Arcynopteryx aurea new species 
Adult 
Distribution. — California. 
$ . — Length to tip of wings, 21 mm.; expanse of wings, 32 mm. 
This species is apparently rather closely related to Arcynopteryx vagans. It 
is yellowish-brown with yellow markings. Head triangular, three small ocelli 
arranged in an isosceles triangle the base of which is greater than the sides, 
the distance from the inner margin of the eyes to the posterior ocelli less than 
the distance between the posterior ocelli, but greater than that from them to 
the anterior ocellus. Outside the ocellar triangle, conspicuous, dark brown 
tubercles situated a little nearer the paired ocelli than the inner margin of 
the eyes. M-shaped mark prominent. The anterior region of the head uni- 
form yellowish brown, the occiput wdth three pale yellow spots, a small median 
triangular one with larger oval ones on either side. Under side of head, pale, 
palpi brown. 
Pronotum quadrangular, wider than the occiput and a little wider than long, 
only slightly narrowed posteriorly, sides straight, anterior border markedly 
convex, posterior one a trifle arcuated, anterior angles rather sharp, posterior 
ones rounded; a broad median yellow stripe, lateral fields embossed. A similar, 
broad median stripe on the mesonotum, and a small median marginal spot on 
the anterior border of the metanotum. Venter of thorax pale with a median 
shield-shaped darker marking on each of the three segments, from these dark 
median spots on the last two segments, transverse extensions run out laterally 
just anterior to the base of the legs. Legs yellowish-brown, bases and tips of 
femora and tibiae, and tarsi, dark brown. Tips of wings broadly rounded, 
venation pale brovm; a rich irregular network of cross-veins between costa 
and the anterior branches of the sector, in the fore-wing there is not a long 
costal area beyond the hmneral cross-vein that is free from cross-veins, sub- 
costa passes into radius slightly beyond the level of the cord, the length of the 
inner inter-radial cell twice as great as its base, first anal vein forked (fig. 64) . 
Five pairs of long, white, slender, fleshy, finger-like tracheal gills arranged as in 
Arcynopteryx vagans, one pair widely separated on the base of the submentum, a 
second pair on a line with the first in the articulation between head and thorax, 
TRANS. AM. ENT. SOC., XLIII. 
