The single species placed here [in Rhizocecis] is responsible for tuberlike galls on aerial rootlets of Toxicodendron radicans (L.) Kuntze (Anacardiaceae). It had previously been placed in Dasineura (Gagné 2010).

[Rhizocecis] rhois. USA (New York, Maryland, Virginia). Rhus toxicodendron (Anacardiaceae). Cecidomyia rhois Coquillett 1895a: 348. USA: New York, Lebanon Springs; ST; ♂,♀; USNM.

Tuberlike swelling on aerial rootlet...Dasineura rhois (Coquillett)
Each swelling contains one larva. Larvae overwinter in the galls, and adults emerge in spring. Host: R. toxicodendron. Dist.: New York to Virginia.

[note: It is not clear what "R. toxicodendron" refers to here. It is not an accepted name in the plant taxonomy source cited by Gagné elsewhere in his book (National List of Scientific Plant Names, USDA-SCS, 1982). Current taxonomic authorities (e.g. Weakley (2023), POWO) list it as a synonym for Toxicodendron pubescens, but that is a southern plant not known to occur spontaneously in New York, and would be near the northern edge of its range in Virginia. In a later publication (2013) he assigns this midge to galls on Toxicodendron radicans, common poison-ivy.]