Ancistrocerus waldenii flavidulus Bequaert occurs in the Pacific Coastal regions of northern California and Oregon (Bequaert, 1943, Entomol. Am., 23:225-295). Previous biological information on A. w. flavidulus is based on two nests reported by O. W. Richards (I 962, Pan-Pac. Entomol., 38: 145-146) from Marin County, California. The nests were located within rock crevices and consisted of several cells plastered over with mud. Richards also reported that prey were larval Tortricidae (Cnephasia and Archips). The data presented here are based on a nest found on a west facing road cut at Shelter Cove, Humboldt County, California, on 21 May 1976. The mud nest (Fig. 1) was in a shallow depression in the slightly overhanging side of a protruding rock.
Coville, Rollin E., "A Note on the Biology of Ancistrocerus Waldenii Flavidulus Bequaert (Hymenoptera: Eumenidae)" (1983). Co. Paper 147.
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