70 THOMAS SAY FOUNDATION 
patterned nymphs the clypeal area is brownish, also with some 
brown on the occiput; hind ocelli a little closer to the eyes than 
to each other ; occipital ridge absent ; antennae about half as long 
as body and composed of about forty-eight segments. 
Pronotum transversely oval, and about twice as wide as long; 
marginal groove distinet in front and rear; sides somewhat 
flanged and yellow; central area yellow, but completely sur- 
rounded by brown; margin fringed with short spinules and a 
few longer hairs. Meso- and metanotum mottled with yellow and 
brown. Legs slender, yellow, with a fringe of long hairs. 
Abdomen nearly gylindrical; tergites brown except for a me- 
dian yellow transverse band. Cereci more than half as long as the 
body and composed of about thirty segments, each segment ter- 
minating in a whorl of short spinules. Subanal lobes rather long 
and attenuated at the tip. 
The sexes are not easily recognized. In the female, the posterior 
margin of the eighth abdominal sternite shows a slight emargina- 
tion in the center, and there are no spinules in this area. In the 
male, the posterior margin of the eighth abdominal sternite is 
either straight or slightly produced in the middle, and the row of 
marginal spinules is continuous; the ninth sternite is slightly 
more produced posteriorly in the male than in the female. In 
mature nymphs the details of the genitalia can often be clearly 
seen. 
Mouth parts. Labrum more than three times as wide as long; 
anterior margin with a fringe of long hairs. Mandibles with six 
unequal teeth arranged in two groups of three each; following 
the teeth is a fringe of long hairs. Maxillae: cardo and stipes 
about equally long; lacinia very wide at the base, and equally 
wide up to the base of the teeth; bidentate, the second tooth a 
little more than half as long as the terminal one; margin beyond 
teeth with a fringe of long stout hairs, also a couple of hairs be- 
tween the teeth; galea about half as long as lacinia and tipped 
with a seta; maxillary palpus long, slender, and with the terminal 
segment much attentuated. Labium about as wide as long; glossae 
small; paraglossae large, hairy, somewhat attentuated, and with 
a few papillae at the tip; palpi long and slender, the apical seg- 
ment as slender as the apical segment of the maxillary palpus. 
Hypopharynx broadly rounded. 
Many nymphs from Elkhart, Indiana, April to May (R. 
Weith), and reared specimens from Work’s Brook, Ottawa, II- 
linois, April 8, 1902. 
