THE MOUNT DESERT liEClOX 47)7 



Rhyssa Gravenhorst 



This genus is reported as parasitic on horn tails of the 

 genera Sirex and Zeris. 

 R. lineolata (Kby.). Generally distributed in July and 



Aug. Reared from larch with Urocerus albicomis, which it 



parasitizes, June '43. 

 R. peesuasoria (Linn.). Bar Harbor, Aug. 10. 



Megarhyssa Ashmead 



M. atrata (Fab.). Numbers were ovipositing on dead maple 

 tree at the foot of Newport Mt. June 11. At the same time 

 numbers of M. nortoni were at w r ork as were numbers of 

 Tremex columba. Generally distributed June-July. 



M. greenei Viereck. One specimen of this scarce form was 

 taken with those above June 11, '37. 



M. nortoni (Cress.). Echo Lake; Bar Harbor, June 27- 

 July 21. Numbers were ovipositing on the dead maple men- 

 tioned above. One small specimen taken June, '34. Common. 



Theronia Holmgren 



T. atalantae (Poda). Witch Hole Pond, Sept. 11. 

 T. hilaris (Say). Laboratory, Sept. 8. 



Xorides Latreille (Xylonomus Gravenhorst) 



X. albopictus (Cress.). Several hatching under the bark of 

 a dead maple at the Tarn, May 23, '37. Supposed to be para- 

 sitic on S a per da discoidea. 



X. humeralis (Say). Salisbury Cove, July 27. 



X. stigmapterus stigmapterus (Say). Salisbury Cove, June 

 9. 



Odontocolon Cushman 



0. atripes (Roh.). Bar Harbor, June 21. 



0. aethiops (Cress.). Bar Harbor, June 21. 



O. canadense (Prov.). Echo Lake; Long Pond, June 26- 

 July 12. Parasitic on Leptura, Dicerca and other wood- 

 boring beetles. Type locality Echo Lake. Type taken by C. 

 W. Johnson. Proc. U.S.N.M. Vol. 77, Art. 3, pp. 1-15. No. 

 2826, pp. 11-12. 



