Modified floret...
Gall more or less cylindrical...
Gall widest near apex, smooth...Rhopalomyia sp.

This species is known only from its brown galls at the USNM and is only tentatively identified as a Rhopalomyia. Host: S. canadensis. Distr.: Maryland.

[notes: The galls are also figured in this book in a drawing. The figure shows them occurring on a raceme-like array, this array occurring lower-down on the main inflorescence axis than the unmodified flowering arrays. In the place of typical flower-heads there are small rosettes of narrow bracts, most of which have one of these tiny galls in its center. As drawn, the galls are actually more bell-shaped than cylindrical, with a slight flare at their apices. They are depicted as much smaller than Schizomyia racemicola and Rhopalomyia anthophila galls, which are drawn on adjacent arrays in the same figure.

Gagné uses "S. canadensis" in a very wide sense, including at least S. altissima and S. gigantea. Maryland is nearly out of range for S. canadensis in the strict sense, so these other species are also listed on this page as perhaps more likely hosts.]

- Raymond J. Gagne: (1989) The plant-feeding gall midges of North America^©