98 
Psyche 
[June 
Ichneumon irritator Fab., New Cumberland, Pa. Host — Cyllene 
pidus. Hummelstown, Pa., parasite of Chrybothris sp. 
larvse found in sapwood of dead Cercis canadensis, — Kirk 
and Knull. 
Ichneumon comstocki Cress. (Det. Vier.), Rockville, Pa. Reared 
from Evetria comstockiana, — V. A. E. Dsecke. 
Rhyssa lineolata Kirby (Det. Cush.), Mt. Holly, Pa., June 14. 
Adult female ovipositing in dead hemlock infested by 
Urocerus albicornis. 
Urocerus albicornis Fab., New Bloomfield, Pa. This horntail 
infested hemlock stumps, trees cut one year ago. At this 
time (Aug. 1) adult females are flying. Cutting into 
infested stumps we found pupae of males and females, 
also mature larvae, small larvae and apparently newly 
hatched larvae, as well as parasites. 
Among the parasites, R. lineolata was common. Adults were 
collected from July 10 to 30 at various localities. On Aug. 1, at 
New Bloomfield, pupae and newly transformed adults were 
chopped from the Urocerus cells. Observation by Knull and 
Champlain. 
Rhy sella humida Say (Det. Cush.), Rockville, Pa. A parasite of 
Xiphidria champlaini Roh. in dead Carpinus caroliniana. 
Megarhyssa nortoni (Cress.), New Bloomfield, Pa., July 21 and 
August 1. Adults ovipositing in stumps infested by 
Urocerus albicornis,— Knull and Champlain. 
Arotes formosus (Cress.) (Det. Cush.), Dauphin, Pa., Clarks 
Valley, VI-5. Parasite of Bellamira scalaris in dead river 
birch ( Betula nigra), — Kirk and Champlain. 
Gelis bruesi (Strickl.) (Det. Cush.), Rockville, Pa. Parasite on 
the eggs of Drassid spider. The spider egg cases were 
collected from the under side of stones. The cocoon of 
the parasite was in the space originally occupied by the 
spider egg mass. 
