98 . Psyche [June 



Ichneumon irritator Fab., New Cumberland, Pa. Host — Cyllene 

 pictus. Hiimmelstown, Pa., parasite of Chrybothris sp. 

 larvae found in sapwood of dead Cercis canadensis, — Kirk 

 and Knull. 



Ichneumon comstocki Cress. (Det. Vier.), Rockville, Pa. Reared 

 from Evetria comstockiana, — V. A. E. Daecke. 



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. 



Rhysella humida Say (Det. Cush.), Rockville, Pa. A parasite of 

 Xiphidria champlaini Roh. in dead Carpiniis 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 (Betida 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. 



