PLECOPTERA NYMPHS OF NORTH AMERICA 107 
formly yellowish brown; the hind wing pads directed away from 
the body slightly more than the front ones, but not quite so much 
so as in 7’. nivalis. 
Legs flattened, yellow; the femora with a more or less distinct 
transverse band beyond the middle; both femora and tibiae 
with a fringe of long hairs on the outer margin; first two tarsal 
segments about equal in length, and together a little shorter 
than the third segment. 
Abdomen somewhat flattened ; yellowish, with brown mottlings 
over the basal half of each segment, and with brown, short hairs 
over the entire surface; cerci long and slender. 
Gills absent. 
The sexes are easily distinguished. In the female, the ninth 
abdominal sternite is prolonged into a hairy, tongue-like plate 
which projects normally beyond the tip of the abdomen. In the 
male the ninth abdominal sternite is produced in a wide, flattened 
plate which gradually tapers almost to the tip, then turns up 
in a square process, very similar to the subgenital plate of the 
adults; the tenth tergite has a small median projection on the 
posterior margin, within which develops the supra-anal process. 
The larger size of the subgenital plate, and the fact that in the 
male it turns up and projects far beyond the end of the abdomen, 
readily distinguish the male from the female. 
Plummer’s Island, Md.; Illinois. 
Taeniopteryx californica Needham and Claassen 
Male. Length of body up to 10 mm.; antennae up to 7 mm.; 
cerci up to 8 mm. 
General color yellowish brown with darker markings on the 
body and with wide, brownish, transverse bands on the femora, 
sometimes only faintly indicated. 
Head narrower than pronotum; brown, with a yellow area 
just back of the ocellar triangle, and with a lighter yellow area 
in front of the anterior ocellus; hind ocelli at least twice as 
close to the eyes as to each other; antennae light brown, slightly 
more infuscated toward the tip. 
Pronotum a little wider than long, brown, with a lighter area 
in the center of each lateral disc; surface nearly smooth, except 
for the more or less crescentic, irregular, embossed markings; 
angles broadly rounded. Meso- and metanotum marked with yel- 
low and brown; front wing pads diverging only slightly from 
the body; hind wing pads diverging at about a 20° angle. Legs 
