MAY PLIES AND MIDGES OF NEW YORK o7 



Ecdyums maculipennis Walsh 



As remarked under the account of the Heptagenia 

 interpunctata, this species was found commonly in Fall 

 creek, at Ithaca. Its larvae were more commonly found at the 

 edges of the stream ; those of that species of tener in the current, 

 but both often occurred together. This is a dainty little species 

 with narrow wings, conspicuously marked with black on the 

 crossveins (pl.4, fig.3). My 'bred specimens bear the dates July 

 9th, 13th and 14th, 1901. 



The nymph. (P1.7, fig.3.) Length, 7 mm.; antennae, 2 mm., 

 and setae, 5 mm. additional. 



Body strongly depressed, elongate triangular in outline, widest 

 across the dilated, depressed and squarish frons, and rather regu- 

 larly tapering posteriorly; head rather flat above; paired ocelli 

 larger and more approximate above in the male than in the fe- 

 male; antennae slender and short. Mouth parts as shown in 

 figs.l2j, 13e and 14p. 



Legs short, femora flattened, with a thin external fringe of 

 hairs; tibiae slender and somewhat tapering; Aving cases reach- 

 ing the level of the apex of the 3d abdominal segment; abdomen 

 rather short and slender, slowly tapering to the apex, middle seg- 

 ments longest, segments 8 and 9 slightly shorter, 10 again longer 

 on the dorsal side, but shorter at the sides and helow; lateral 

 spines present on segments 5-9, longest on 6 and 7, straight and 

 sharp ; setae divaricate, the median one in the mature UA^mph more 

 slender; the apical rings of brown on the segments of the setae 

 are alternately (broader and narrower, and the apical whorls of 

 setae are excessively short. 



Greneral color pattern olive brown, mottled with pale greenish, 

 darker on head and prothorax, divided by a median narrow pale 

 line, and varied upon the sides Avith pale hieroglyphics ; abdomen 

 with pale and indistinct fenestrate markings along the sides. In 

 the male there are broad dorsal blotches on the dorsum of seg- 

 ments 4 and 5; in the female, on segments 7, 8 and 9. 



Iron sp? 



This species has not been bred. It is found in Coy Glen — a 

 spring-fed stream near Ithaca, possessing a rich and peculiar 

 fauna. Among our forms hitherto made known this species is 

 peculiar in the possession of but two caudal setae in the nymphal 

 stage. I have a number of nymphs collected years ago, from 

 which, unfortunately the date label has become detached. 



