Published online by Cambridge University Press: 31 May 2012
A brief infestation of near outbreak proportions by larvae of Hylemya extremitata Malloch occurred on bromegrass, Bromus inermis Leyss and B. pumpellianus Scribn., at Beaverlodge, Alta., in 1971–72. Larvae feeding primarily on meristematic tissue caused injury to as many as 20% of the grass tillers examined. Mature larvae overwintered within the tillers. Adults emerged in mid-June. Descriptions are given of the three larval stages of this species and of mature larvae of the first two of the following four species of Chloropidae, which were also found living within the bromegrass: Olcella provocans (Becker), Oscinella coxendix (Fitch), Oscinella incerta Becker, and Conioscinella melancholica Becker.