SOME NEW STONEFLIES FROM WESTERN CANADA

Extract

In collections made by the writer during the last few years the following new forms have appeared, the types of which are in his collection.

Isoperla fumosa sp. nov.

Adult. Head brown, yellow around eyes and bases of antennae, a yellow spot in the ocellar triangle and another in front of the anterior ocellus; antennae and palpi brownish. Prothorax with angles somewhat rounded, brown with darker rugosities on either side of the broad central yellow stripe. The latter has a narrow brown central line. Wing veins brown. Legs brown. Abdomen brown with a little pale colour at the base and a pair of dorsal yellow dots on most of the segments. These dots are sometimes nearly obscured. Cerci dark brown at base, paler beyond.