380 BIOLOGICAL SURVEY OF 



SiRiciDAE. The Horn Tails 

 SiREX Linnaeus 



S. ABBOTii Kirbv. Mt. Desert, Aug. 10. Bred from balsami 



(Br.), Sept. 26. 

 S. ABDOMiNALis (Hariis). Bar Harbor flying, Aug. 5. Bred 



Sept. 9 from a lot of mixed hardwood. 

 S. JuvENCus var. cyaneus Fab. Bar Harbor, Sept. 20 (Br.). 



Bred from spruce at Corfield Sept. 9-17. 



U'kocerus Geoffroy 



U. ALBicoRNis Fab. Bar Harbor and west side of Island in 

 July. The larva bores in spruce and fir. The best way to 

 take these is to go where trees are being felled for pulp 

 and climb into and search the tops. 



IT. CREssoNi Nort. Bar Harbor (Br.) and Penikese, July 8- 

 Aug. 11. Scarce. 



U. FLAvicoRNis Fab. Bar Harbor, August 9 (Br.). 



Xkris Costa 



X. SPECTRUM (Linn.). One specimen on cord wood at Eden, 



June 24, '37. Rare. 

 X. CAUDATA Cresson? Bar Harbor, July 28 (Br.). 



Tremex Jurine 



T. coLUMBA (Linn). On August 31, 1936, I found a partially 

 dead maple tree in which dozens of this species were ovaposit- 

 ing as were Megarhyssa atrata, M. nortoni, and among them 

 one M. greenei. After taking a series of specimens, the 

 tree was left and then cut and Dr. Brower brought it 

 into the insectary and it is yielding some wonderful material 

 for life history. LTp to the present 777 individuals have 

 hatched. 



