64 ENTOMOLOGICAL NEWS. [March, 



Superior appendages yellowish white, with a narrow black band on the 

 base as far as the inferior tooth. About the same width for one-third of 

 the length, then abruptly narrowed from the outside to slender points, 

 which are turned outward and upward at the ends; from the base curved 

 outwards until, at one-third the length, the two are wider than the loth 

 segment, then curving inwards, and at the apex outwards and upwards. 

 An inferior obtuse tooth at one-third of the length from the base. 



Inferior appendage dark brown, lighter above, the tips and base black, 

 three-fourths as long as the superior appendages; bifid about one-half the 

 length; the outer edges parallel and widest at the base, narrowing from 

 the inside to blunt, upturned tips, which approach the superior appendages 

 and are equally divergent; sinus open. In profile view, curved down- 

 wards in the basal third, then gradually upwards to the apical third, which 

 curves rapidly upwards. Both appendages clothed with hairs, those on 

 the upper pale, those on the lower dark. 



-The females are somewhat variable. Of three specimens before me 

 two have the second ante-humeral stripe entire, but narrowed in the mid- 

 dle; the other has the stripe interrupted in the middle, the upper part pale 

 and hardly half so long as the lower. One of those with the full humeral 

 stripe lacks the yellow dorsal spot on the 8th segment. The back of the 

 vertex yellow, and also a triangular space on its front. The suture be- 

 tween the frons and nasus is black only at the outer angles. The sides 

 of abdominal segments i and 2 and the basal half of 3 yellow, also the 

 sides of 7-9 yellow with black in the upper anterior part. 



Described from forty specimens taken at Cheino Stream below 

 the bridge at the old mill, Bradley, Me., July 8, 1897, by F. L. 

 and Bartle Harvey. 



The specimens were flying up stream, and were nearly all taken 

 from a small rock six inches out of water, upon which they 

 would almost invariably alight by preference, although there were 

 several other rocks apparently equally favorably situated. It is 

 hard to take them on the wing as they fly very close to the water. 

 The whole day was occupied in watching the stream by the writer 

 and his son. Only three females were seen. One pair was taken 

 in copula. My son spent the whole of the following day at the 

 same place on the stream and did not see a single specimen. 

 Two or three specimens were seen the last of July over swift 

 water on Birch Stream in Greenfield, about eight miles from the 

 other locality. The male of this species previously unknown is 

 now represented by many more specimens than the female. 



