74 THOMAS SAY FOUNDATION 
markings on the sides of the abdomen; surface hairy; posterior 
margin of each segment with a row of short spinules. Cereci 
brownish; about twenty-five segments, each of which ends in 
a whorl of short spinules and with longer hairs on the dorsal 
surface. 
This is one of the most common stoneflies in the Central and 
Eastern States. 
Ithaca, N.Y.; North Lansing, Mich. 
Isoperla 5-punctata Banks 
Length of body up to 12 mm.; antennae up to 7 mm.; cere 
up to 6 mm. 
General color yellow with brown markings; easily recognized 
by the wide median yellow stripe running the entire length of 
the abdomen and a broad brown stripe on each side. 
Head a little wider than pronotum; brown, with a few lighter 
spots in front of the ocellar triangle, and a large yellow irregular 
spot between the eyes; surface smooth, with a rather sparse coat- 
ing of short brown hairs; antennae with about fifty segments. 
Pronotum approximately half again as wide as long, more or 
less uniformly brown except for a wide median longitudinal 
yellow line, and the yellow lateral margins; angles rounded, the 
posterior ones more so than the anterior ones; surface nearly 
smooth and covered with brown hairs which are longer on the 
outer margin than on the surface. 
Meso- and metanotum yellowish with longitudinal darker mark- 
ings, especially noticeable on the wing pads. Legs uniformly 
brownish, bearing a fringe of long hairs. 
Abdomen with a broad median longitudinal yellow band, on 
either side of which there is a longitudinal brown band. Sides 
and ventral surface of abdomen more or less uniformly yellow- 
ish brown; cerci composed of about twenty-eight segments. 
This species was described from a nymphal skin of a female 
which was reared by Miss Robinson, at San Jose Creek, near 
Pomona, California, March 20, 1923. I have, also, nymphs from 
San Antonio Canyon, California, May 12, 1923; Logan River, 
Utah, June 238, 1926, J. G. Needham; Santa Fe, New Mexico, 
June 1, 1904, P. B. Powell. 
Isoperla petersoni Claassen 
(Plate 20, fig. 197:) 
Length of body up to 9 mm.; antennae up to 4.5 mm.; cerci 
up to 4.5 mm. 
