PLECOPTERA NYMPHS OF NORTH AMERICA 1038 
poor fliers, and remain near the streams where they may be col- 
lected by sweeping the vegetation, or sometimes they may be 
clubbed off the trees along the banks. Very little is known about 
the habits of the nymphs and adults except that Newcomer (32) 
has reported that the adults of 7’. pacifica sometimes cause injury 
by feeding upon fruit buds in the orchards along streams, and 
Frison (6) reports them to be feeding on Protococeus. 
Key to the Nymphs of Taeniopteryx 
1. Coxae with segmented tracheal appendages ............. 2 
Soeace without tracheal rilis! aoe. 6<- didemae)s ait ct dee 4. 
2. Usually with a distinet mid-dorsal stripe extending from head 
to tip of abdomen; mature nymphal males showing the 
ventral lobe-like appendage on the ninth abdominal sternite 
MeprCmevOLODING SACU Lig ere a Pecans ers, «cise Rte miseela, wha ta a 3 
Without a distinct mid-dorsal stripe; males without ventral 
Pope KCI D DCNOAVC sn os ed Geis st parvula (p. 105) 
3. Length of body up to 14 mm., general color dark brown to 
blackish; males without tooth on hind femora; common- 
est of the eastern species of this genus. ....ntvalis (p. 108) 
Length up to 10 mm., general color yellowish to ight brown ; 
males with a tooth on hind femora ........ maura (p. 104) 
4. Ventral appendage of ninth abdominal sternite triangularly 
produced in the female, while in the male this appendage 
is more square and slightly upturned at the tip ......... 
5 ahd Mee Pina eh cee fascrata (p. 106) 
Ventral appendage in both male and female broadly rounded 
“Ue TPA Sead Sooo aor Sin os ees eee califormea (p. 107) 
Taeniopteryx nivalis Fitch 
(Plate 9, figs. 135-140; plate 29, fig. 210; plate 33, fig. 229.) 
Length of body up to 14 mm.; antennae up to 9 mm.; cerci 
up to 8 mm. 
General color dark brown to blackish, with lighter markings, 
and usually with a very distinct median, dorsal, yellow line ex- 
tending from the head to the tip of the abdomen. 
Head somewhat narrower than pronotum; yellowish or brown, 
with darker mottled areas over the occiput behind the ocellar 
triangle, and a dark area in front of the latter, as well as a darker 
spot at the base of the antennae near the eyes. Three small ocelli, 
the posterior ones at least three times as close to the eyes as to 
each other, and set forward on the head so as to be in almost 
