3IO Transactions of the Canadian Institute [vol. ix 



Eucosma scudderiana Clemens, 



Solidago canadensis L. 



Solidago serotina var. gigantea Gray (seldom). 

 Gnorimo schema gallcesolidaginis Riley. 



Solidago canadensis L. 



Solidago serotina var. gigantea Gray. 



Solidago rugosa Mill (seldom). 

 Gnorimo schema gallceasterella Kellicott. 



Solidago latifolia L. 



Solidago ccEsia var. axillaris Gray (seldom). 

 In speaking of the host plant of this producer Busck^^ makes the 

 following statement: "I have before me specimens from Miss Clarke, 

 which were unquestionably bred from the white wood-aster, Aster divari- 

 catus L. {A. corymhosum Ait.) near Boston." 

 Stagmatophora ceanothiella Cosens. 



Ceanothus americanus L. 

 Tucker*^ states that C. ovatus Desf . is also a host plant of this species. 



The following dates taken from records of specimens represent ap- 

 proximately the time of emergence of the moths: 



Memythrus tricinctus Harris — July 4 to 8. 



Eucosma scudderiana Clemens — June 8 to 20. 



Gnorimoschema gallcesolidaginis Riley — August 5 to 15. 



Gnorimoschema gallceasterella Kellicott — August 12 to 19. 



Stagmatophora ceanothiella Cosens — June 23 to 30. 



The two species of the genus Gnorimoschema pass the winter in 

 the imago stage but Eucosma and Stagmatophora in the larval form. 



Several galls of the Eucosma moth were opened December 11, 

 and the data collected were as follows: — ^The larva was in a dormant 

 state in the portion of the stem of the plant immediately below the gall. 

 Before passing into this inactive condition the larva had carefully pre- 

 pared for the emergence of the imago from the gall. The wall of the 

 gall cavity had been eaten through until the part remaining was thin 

 enough to permit the passage of light. The exit thus prepared was 

 located at the upper end of the gall and was on an average 2 mm. in 

 diameter. 



A silk lining covered the whole of the interior of the gall and a 

 partition of especially strong silk crossed the cavity just opposite the 

 opening mentioned above. This partition did not pass straight across 

 the gall but was found always in a slanting direction. It was attached 

 to the gall wall just above the aperture and was always higher on that 

 side. 



