The gall's range is computed from the range of all hosts that the gall occurs on. In some cases we have evidence that the gall does not occur across the full range of the hosts and we will remove these places from the range. For undescribed species we will show the expected range based on hosts plus where the galls have been observed.
Our ID Notes may contain important tips necessary for distinguishing this gall
from similar galls and/or important information about the taxonomic status of
this gall inducer.
Created Feb 4, 2026 1:47 PM UTC
•
Last updated Feb 4, 2026 1:47 PM UTC
New Western Gall Midges
EP Felt
(1916)
This midge was reared in May, 1913, by Mr, P. H. Timberlake from a pubescent, variable, conical, stem gall on rabbit brush, Chrysothamnus graveolens [Ericameria nauseosa], collected in the vicinity of Murray, Utah. The species approaches closely R. utahensis, from which it may be most easily separated by its decidedly smaller size, the fewer antennal segments and particularly by the peculiar type of gall.
Gall. — A variable, conical outgrowth of the stem with a height of about 4 mm. and a basal diameter of 2 to 3 mm. The gall contains basally, an oval, thin-walled cell with a length of 2.75 mm. and a diameter of 1.75 mm., the hollow, distal portion being filled with a slender, thread-like growth of delicate cells placed end to end and forming a rounded or, in some cases, nearly truncate plug.
