PROC. ENTOMOL. SOC. WASH. 98(3), 1996, pp. 570-591 NEW SPECIES AND HOST RECORDS OF APHID PARASITOIDS (HYMENOPTERA: BRACONIDAE: APHIDIINAE) FROM THE PACIFIC NORTHWEST, U.S.A. K. S. Pike, P. Stary, R. Miller, D. Allison, L. BoYDSTON, G. Graf, and T. Miller (KSP) Entomologist and (DA, LB, GG) Research Technicians, Washington State Uni-versity, Irrigated Agriculture Research & Extension Center, 24106 N Bunn Road, Prosser, WA 99350, U.S.A.; (PS) Entomologist, Institute of Entomology, Academy of Sciences of the Czech Republic, Branisovska 31, 370 05 Ceske Budejovice, Czech Republic; (RM) Research Associate, Washington State University, Tree Fruit Research & Extension Center, Wenatchee, WA 98801, U.S.A.; (TM) Insectary Manager, Northwest Biocontrol Insectary & Quarantine, Washington State University, Pullman, WA 99164-6380, U.S.A. Abstract. — The aphidiine parasitoids (Hymenoptera: Braconidae: Aphidiinae) of the Pacific Northwest, U.S.A., were surveyed. Findings are based principally on field col-lections from Washington, but a few records from nearby states are included. Twelve genera and more than 40 species are recorded. The material was obtained from pest and nonpest aphid rearings sampled from a range of farmland and neighboring envi-ronments. Complete records are provided on the parasitoid species, associated aphid and plant hosts. Four new species of aphidiine parasitoids are described and illustrated: Binodoxys clydesmithi Pike and Stary, n. sp. (hosts: Zyxaphis sp. and Obtusicauda coweni Hunter on sagebrush, Artemisia tridentata), Binodoxys graft Pike and Stary, n. sp. (hosts: Aphis helianthi Monell, Aphis nr. varians Patch, and Aphis sp. on Epi-lobium angustifolium), Pauesia pseudotsugae Pike and Stary, n. sp. (host: Cinara pseudotaxifoliae Palmer on Pseudotsuga menziesii), and Trioxys rosae Pike and Stary, n. sp. (host: Macrosiphum rosae (L.) on Rosa sp.). Also, Trioxys cirsii (Curtis), a European species, was detected for the first time in North America (host: Drepanosi-phum platanoides (Schrank) on Acer pseudoplatanus) . Key Words: Parasitoids, new species, Binodoxys, Pauesia, Trioxys, aphids Research on aphidiine parasitoids (Hy-range of the aphid parasitoids across a menoptera, Braconidae, Aphidiinae) began range of farmlands and neighboring eco-in Washington in 1989 in association with systems. The success or extent of parasitoid studies on the biological control of Russian activity on pest aphids is linked in part to wheat aphid, Diuraphis noxia (Kurdjumov). their alternate hosts. The present work rep-Discovery of new species of parasitoids at-resents the first comprehensive review of tacking grain aphids (Pike and Stary 1995b) the known aphidiine parasitoids (Hymenop-demonstrated a lack of knowledge concern-tera: Braconidae: Aphidiinae) of the Pacific ing the aphid parasitoid species richness Northwest, U.S.A. region, and provides a and activity within the region, and prompt-basis for further work on such topics as spe-ed expanded environmental studies to ex-cies richness, abundance, spatial and tem-plore and define the diversity and host poral distributions, host-habitat preference.
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