45 
voix, Michigan, sent by Dr. Henry B. Ward. Mr. Needham has 
also two quite young nymphs of perhaps the same species sent 
him by Mr. F. C. Willard from Tombstone, Arizona. These all 
have labial characters similar to E'piwschna heros. The nymph 
has been described and figured by Cabot (’81, p.28; Pl. IIL, Fig. 
1), but it does not seem superfluous to present here a detailed 
description, drawn up from the Lake Geneva specimens and 
from material bred by Mr. Needham at Ithaca, New York, in 
1897. It differs from the remaining species of the genus in the 
greater size of the lateral spines of the sixth abdominal, as 
described in the key. 
A full-grown male nymph from Montana presents some ap- 
parently trivial differences which, under the circumstances, it 
will perhaps be best to mention. On either side of the open 
end of the labial cleft isa minute tooth ; the tooth on the inner 
apical angle of the lateral lobes is less acute than in the typ- 
ical specimens and not so distinct. The lateral spines of the 
fifth segment are identical with those of the typical examples, 
but the others are a trifle longer and more divergent. The 
notch of the superior appendage is a little deeper. In length 
this appendage is exactly intermediate between the inferiors 
and laterals, as in the typical specimens, but the laterals are 
relatively shorter and the inferiors longer, the laterals being 
very little more than half the length of the inferiors. 
The nymphs measure 40 mm.; abdomen 26 mm.; hind femur 
8 mm.; width of abdomen S$ mm., of head8 mm. Color blackish 
brown, paler below on legs, on lateral margins of abdomen, and 
on superior and inferior abdominal appendages. Two black 
marks upon the costal edge of each wing-case near the base, a 
pair of black dots near the tip of the basal male enlargement 
of the superior appendage, and a similar dot near the tip of 
each lateral. 
Head narrowed behind the eyes to the broadly rounded 
hind angles, one third wider across the eyes than across the 
hind angles; hind margin moderately concave, with some coarse 
pubescence disposed in numerous irregular rows near the hind 
angles. 
