43 



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 Epiwschna Jieros. The nymph 

 has been described and figured by Cabot ('81, p. 28; PI. III., 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 lie best to mention. On either side of the open 

 end of the labial cleft is a 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 ])etween 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 8 mm., of head 8 mm. Color blackish 

 brown, paler below on legs, on lateral margins of abdomen, and 

 on superior and inferior al)dominal 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. 



