82 Journal New York Entomological Society, tvoi. xxx. 



on the larva and its gall. Busck^ in 1900 placed the species in a new 

 genus Gnorimoschema and called gallcrsolidaginis the type. Since 

 then the species has been rather frequently referred to by naturalists 

 so that its distribution is known to include the States of Colorado, 

 Missouri, Minnesota, Michigan, Vermont, Massachusetts, Connecticut, 

 New York, Pennsylvania, New Jersey, Maryland, District of Colum- 

 bia, Virginia and North Carolina, and will probably be found to occur 

 in the neighboring states. The life-history is therefore known in a 

 general way although the few references concerned contain some con- 

 flicting statements particularly regarding the adult and its habits. 



The life-history of a closely related species Gnorimoschema salina- 

 ris Busck has more recently (1915) been reviewed by Prof. J. T. 

 Patterson.- The larva of this species forms a similar gall on Solidago 

 sempervirens whereas G. gallcesolidaginis has been found by the writer 

 to breed in the stems of the Solidago canadensis , serotina, and nemo- 

 ralis. There are points in the life-history and appearance of the galls 

 of the two species which differ noticeably, but the adults are very 

 difficult to distinguish. 



Life-history Summary. 

 The insect is single brooded. The fully formed oblong or elliptically 

 shaped gall (Plate VIII, Fig. 3) is to be found from the latter part 

 of July ^ on through the winter. If the galls be cut open early in 

 July a uniformly dark colored larva with darker patches on the thorax 

 and abdomen will usually be found in the chamber (Plate VIII, 

 Fig. 4). The larva becomes fully grown during the latter part of 

 July or early in August at which time it measures about 17 mm. in 

 length. Its food for growth has been obtained by gnawing at the 

 stem of the goldenrod from the inside, which action doubtless causes 

 the rod to bulge outward at the feeding place and the gall to be thus 

 formed. 



1 Busck, August, New Species of Moths of the Superfamily Tineina from 

 Florida, Proc. U. S. Nat. Museum, Vol. 23, 1900, p. 22^. 



2 Observations on the Development of Copidosoma gelechice, Biological 

 Bulletin, Vol. 29, No. 6, December, 1915. 



3 All dates unless otherwise specified are for Ithaca, N. Y., conditions. 

 Variations in the time of appearance of different stages in different regions 

 are referred to later. 



