The North American members of the genus Operophtera Hübner (Lepidoptera: Geometridae) are revised to include three species: O. brumata (L.), O. bruceata (Hulst), and O. danbyi (Hulst). Operophtera occidentalis (Hulst) is now treated as a subspecies of O. bruceata. All species are illustrated and characters to distinguish the species are given. The most useful characters for separating O. brumata from O. bruceata include the following: (1) hindwing dorsal surface with discal dot, which is almost always visible on O. bruceata but absent from O. brumata; (2) forewing colour, which is grey-brown or light brown in O. bruceata but reddish-brown in O. brumata; (3) abdomen colour, which is golden-brown to brown in western O. bruceata but brown in O. brumata; and (4) the costa of the forewing ventral surface, which is usually golden-brown in O. bruceata but brown in O. brumata. The structure of the genitalia of these two species allows hybridization between O. bruceata males and O. brumata females, but not vice versa.Hypothesized species interrelationships between palaearctic and nearctic Operophtera are illustrated in a cladogram. Maps for the distribution of each species are also included.

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Fourteen species of parasitoids (13 hymenopterans, 1 dipteran) were reared from larvae or pupae of the obliquebanded leafroller, Choristoneura rosaceana (Harris), collected from commercial raspberry fields in the Fraser Valley, British Columbia, Canada, over 3 years. Levels of parasitism ranged from 5 to 15%. Among these 14 species, five represent new host records. A polyembryonic wasp, Macrocentrus nigridorsis Viereck (Hymenoptera: Braconidae), was the most abundant parasitoid. External feeding on the final host instar is obligatory for M. nigridorsis to complete development. On average, each parasitized host larva produced about 36 M. nigridorsis, in either unisexual or mixed-gender groups. Overall male to female sex ratio was 1:4. Head capsules of mature parasitized host larvae were significantly larger than those of unparasitized ones, suggesting that C. rosaceana larvae parasitized by M. nigridorsis might have an extra larval stage.

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The former genera Oncocnemis Lederer, Apharetra Grote, Hemistilbia Barnes and Benjamin, Adita Grote, Lepipolys Guenée, Homoncocnemis Hampson, and Homohadena Grote are synonymized under Sympistis Hübner. The following are transferred from Oxycnemis Grote to Sympistis: Sympistis franclemonti (Blanchard), comb. n. [Oxycnemis franclemonti Blanchard] and Sympistis subsimplex (Dyar) comb. n. [Oxycnemis subsimplex Dyar]. Two species are transferred to Unciella gen. n. as Unciella primula (Barnes and McDunnough) comb. n. [Oncocnemis primula Barnes and McDunnough] and Unciella flagrantis (Smith) comb. n. [Oncocnemis flagrantis Smith], which along with Leucocnemis Hampson are transferred to tribe Triocnemidini in the Psaphidinae. Supralathosea Barnes and Benjamin is transferred to Psaphidinae: Psaphidini and Catabena pronuba Barnes and McDunnough is transferred to Supralathosea comb. n.. In addition, Cerapoda Smith syn. n. and Prochloridea Barnes and McDunnough syn. n. (Prochloridea is presently in Hodges “unassociated genera”) are synonymized under Rhizagrotis Smith in the Xyleninae. Copanarta sexpunctata Barnes and McDunnough rev. comb. is transferred from Stylopoda to Copanarta. Oncocnemis simplicia Smith syn. n. is synonymized under Homohadena deserta Smith, Oncocnemis mus Troubridge and Crabo syn. n. under Oncocnemis tenuifascia Smith, and Oncocnemis sala Mustelin syn. n. under Oncocnemis aqualis Grote. The following are elevated to species rank: Sympistis deserticola (McDunnough) stat. n., comb. n. [Oncocnemis riparia deserticola McDunnough], Sympistis pallidior (Barnes) stat. n., comb. n. [Oncocnemis figurata pallidior Barnes] and Sympistis pallida (Barnes) stat. n., comb. n. [Oncocnemis homogena pallida Barnes]. The following 50 species are described as new: Sympistis acheron Troubridge, Sympistis amenthes Troubridge, Sympistis amun Troubridge, Sympistis anubis Troubridge, Sympistis anweileri Troubridge and Lafontaine, Sympistis apep Troubridge, Sympistis apis Troubridge, Sympistis babi Troubridge, Sympistis baloghi Troubridge, Sympistis bes Troubridge, Sympistis buchis Troubridge, Sympistis buto Troubridge, Sympistis cherti Troubridge, Sympistis chons Troubridge, Sympistis cleopatra Troubridge, Sympistis cocytus Troubridge, Sympistis collaris Troubridge, Sympistis dischorda Troubridge, Sympistis disfigurata Troubridge, Sympistis doris Dimock and Troubridge, Sympistis hapi Troubridge, Sympistis hathor Troubridge, Sympistis horus Troubridge, Sympistis incubus Troubridge, Sympistis insanina Troubridge, Sympistis isis Troubridge, Sympistis jenniferae Troubridge, Sympistis jocelynae Troubridge, Sympistis khem Troubridge, Sympistis khepri Troubridge, Sympistis knudsoni Troubridge, Sympistis lachrymosa Troubridge, Sympistis min Troubridge, Sympistis mut Troubridge, Sympistis nenun Troubridge, Sympistis opleri Troubridge, Sympistis osiris Troubridge, Sympistis pachet Troubridge, Sympistis ptah Troubridge, Sympistis ra Troubridge, Sympistis richersi Troubridge, Sympistis sakhmet Troubridge, Sympistis septu Troubridge, Sympistis sesmu Troubridge, Sympistis seth Troubridge, Sympistis shait Troubridge, Sympistis shirleyae Troubridge, Sympistis sobek Troubridge, Sympistis sokar Troubridge, and Sympistis serapis Troubridge. Color illustrations are provided for adults of all nearctic Sympistis species. Alphabetical and phylogenetic checklists of North American Oncocnemidinae are also provided, including species formerly placed there, but here transferred to other subfamilies.