106 THOMAS SAY FOUNDATION 
Head about as wide as pronotum; mottled brown; a dark spot 
in front of the anterior ocellus; two dark spots on the inner 
margin of each eye; hind ocelli a little more than twice as close 
to the eyes as to each other; antennae with about seventy-five 
segments. 
Pronotum a little wider than long, brown, with a hghter mar- 
gin, especially noticeable in front and rear; angles broadly 
rounded; surface not very rugose. Meso- and metanotum brown- 
ish; legs somewhat flattened; tibiae with a sparse fringe of long 
hairs on the outer margin; first and second tarsal segments sub- 
equal, together as long as the third. 
Abdomen nearly cylindrical, yellowish brown; cerei yellowish 
with about forty sezments. There are three pairs of filamentous, 
three-segmented, telescopic gills attached to the inner base of: 
the coxae; ninth abdominal sternite somewhat swollen and 
shghtly produced rearward; tenth tergite medially produced into 
an upturned, rounded knob, in which develops the supra-anal 
process. 
Two males from Plummers Island, Maryland, February 24, 
1923, Warner, Barber and Currie. 
The above description is made from two mature male nymphs 
in which the genital structures can be seen very clearly. 
Taeniopteryx fasciata Burmeister 
(Plate 29, figs. 215-216.) 
Length of body up to 8.5 mm.; antennae up to 5 mm.; cerei 
up to 8 mm. 
General color yellow, mottled with brown. 
Head a little narrower than pronotum, yellowish with brown 
mottled markings on the occiput, and with a more or less distinct 
brown band across the ocellar triangle reaching from the base 
of one antenna to the other; a brown U-shaped mark in front of 
the anterior ocellus; hind ocelli about twice as close to the eyes 
as to each other; antennae yellowish with the first two basal seg- 
ments darker and also somewhat darkened toward the tip, com- 
posed of about sixty-five segments. 
Pronotum a little wider than long, yellowish, with darker, 
rugose lateral fields; the front and hind margins also somewhat 
darker ; front angles rather narrowly rounded, hind ones broadly 
so; lateral margins somewhat convex, so that the pronotum ap- 
pears to be somewhat broadened posteriorly. Meso- and meta- 
notum yellowish, with brown markings; wing pads almost uni- 
