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Bulletin Wisconsin Natural History Society fVol. 13, No. 2 
the notch of the female; the occiput is hardly more than half 
as high as found in the female. Figure 4 shows an excellent 
view of the male and the extent of coloration on the abdomen; 
figure 2, E is a new figure of the appendages. 
THE NYMPH 
This description of the nymph is made from ten exuviae col- 
lected with the transforming male and female, care being taken 
to follow most closely those from which these two adults emerged. 
Examination seems to indicate that about half of these exuviae 
were of each sex. 
The following table gives the measurements for those from which 
the male (1) and female (2) emerged, and for the largest (3) and 
smallest (4) specimens: 
Length. 
Abdomen. 
Hind femur. 
Width head. 
Width abd. 
mm. 
mm. 
mm. 
mm. 
mm. 
1 
c? 
39.0 
26.5 
9.0 
6.1 
7.2 
2 
9 
40.2 
29.0 
9.8 
7.0 
8.0 
3 
41.4 
29.0 
9.8 
6.9 
8.1 
4 
37.4 
27.0 
8.8 
6.8 
7 .5 
In 
general 
the fe 
males are 
both longer 
of body 
and stouter 
than the males. 
Body moderately slender, subcylindrical, tapering quite suddenly at 
the 8th abdominal segment, legs and head only with fine hairs. 
Head triangular (fig. 2, C), not extremely compressed, posterior angle 
rounded. Occiput broadly rounded and but slightly indented at center, 
pubescent, and bearing five polished scar-like spots equally spaced across 
the back, the inner three being triangular and the outer pair crescent 
shaped. Eyes normal in size. Antennae long and thick, reaching be- 
yond the labrum, the first segment globular and nearly twice the diameter 
of the others, the second round and of the same diameter as the third which 
is about one and a half times the length of the first and second together, 
the fourth segment a mere tubercle. Labium (fig. 2, D) never extending 
caudad of first coxae; submentum very short, mentum rectangular, very 
little longer than broad, slightly narrowed on its posterior third, median 
lobe Higula) fairly convex and covered with numerous flat spines or hairs 
and possessing a short, strong, apically bifed median tubercle; lateral 
lobe stout, about one-third the length of mentum (exclusive of movable 
hook; and armed with a prominent end hook, eight truncated, back-curved 
teeth and an acute, arcuate movable hook the length of the lateral lobe. 
Wing pads narrow, reaching to the base or . middle of the fourth seg- 
ment, 
