362 J. T. PATTERSON. 



DESCRIPTION OF PLATES. 



PLATE I. 



FIG. i. A typical gall of Gnorimoschema salinaris, Busck, situated at the base 

 of the stalk of the swamp goldenrod, Solidago sempervirens. X /4- 



FIG. 2. Gall cut open to show the position of the mummified carcass of Gnori- 

 moschema. Natural size. 



FIG. 3. Gall cut open and carcass removed to show the shape of cavity. Note 

 that the walls of the cavity are smooth and that the excrement from the caterpillar 

 is packed in the bottom of the cavity. Natural size. 



FIG. 4. Mummified carcass from gall shown in Fig. 3. Natural size. 



FIG. 5. Lepidopterous larva which is an inquiline in the gall of Gnorimoschema. 

 Note the irregular shape of the cavity which contains scattered trash and excrement. 

 Natural size. 



FIG. 6. This gall shows an incomplete passage-way, lying just above the head 

 of the carcass. Normal size. 



FIG. 7. Side view of a gall showing the orifice of the passage-way, closed by 

 silken plug. Natural size. 



FIG. 8. Stalk of swamp goldenrod containing two galls. X % 



FIG. 9. Gall containing a non-parasitized caterpillar. Natural size. 



FIG. 10. Gall containing a parasitized caterpillar. Natural size. 



