244 



The Ottawa Naturalist. 



[Feb. 



EXPLANATION OF THE LETTERS USED IX THE PLATES. 



Cot. = cotyledon; H. = hypocotyl; R.=primary root; Li = first leaf succeed- 

 ing cotyledon; PL. = plumule; B.=bud; S. = scutellum; E. = epiblast. 



Explanation of Figures. 



Fig. 



Fi 



Plate VII. 



19. Seedling of Platanus occidentalis L. 



20. " Liriodendron Tidipifera L. 



21. " Sarracenia purpurea L. 



22. - " DioncBj, mus'cipula Ellis. . 



23. " Catalpa bignonioidcs Walt. 



24. ■' Ipomcra hedcracca Jacq. 



25. " Tilia Americana L. . 



26. " Aralia spinosa L. 



2 7. " Claytonia megarrhiza Parry. 



Plate VIII. 



28. Seedling of Aristolochia Serpcntaria L. 



29. " Sangitinaria Canadensis L: 



30. " Dentaria laciniata Muehl. 



31. " Podophyllum peltatnm h. . 



32. " Erigcnia biilbosa Nutt. 



33. " Clayrtonia Virginica L 



34 and 35. Raminculus abortiviis L,. . 



36 and 37. Gillenia trifoliata Moench. . 



Natural size. 



. 6x 

 . 6x 



f of 

 f of 

 . 3 X 



Natural size. 



.-> X 



GALL MIDGES OF THE GOLDENROD. 



By E. P. Felt, State Entomologist, Albany, N.Y. 



Goldenrod or Solidago, a doniinant characteristic American 

 genus, represented b}^ numerous species and varieties, supports 

 an extensive fauna. This is particularly true of the Cecidomyiidae 

 or gall midges dependent for sustenance upon members of this 

 extensive genus. Every portion of the plant is subject to levy, 

 including the blossom and leaf buds, the leaves, the young 

 branches, the larger stems and even the subterranean rootstock, 

 some species producing galls on several portions of the plant. 

 This is particularlv true of Asphondylia moiiacha which may breed 

 in apparently unaffected florets, inhabits the small apical 

 rosette galls on the branches of Solidago graminifolia and may 

 also be found in peculiar oval cells formed between two adherent 

 leaves on several species of Solidago. These latter galls are 

 evidently caused by the parent depositing eggs between the 

 loosely apposed leaves of unfolding apical buds. The activity 

 of the larva causes the leaf tissues to fuse around the point of 

 injury and, as a result, the affected leaves adhere even after 

 the natural growth of the plant separates their bases and causes 

 them to assume an approximatelv horizontal position. The 



