Notes on Cynipid Galls, Ground Beetles and Ground-dwelling Spiders Collected at Fort Severn, Ontario

A brief collecting trip to Fort Severn, Ontario (55°59' N, 87°38' W), in May 2001 revealed galls of three species of cynipid wasps (Hymenoptera: Cynipidae) on the wild rose Rosa acicularis . Roses and cynipid galls occur along the banks of the Severn River above the tree line because of clay deposits, heat, and rafts of vegetation carried north by the river. Ground beetles and spiders were collected with pitfall traps. Our identification of 15 species of ground beetles (Coleoptera: Carabidae), two of them new records for Ontario, and 11 species of ground spiders (Araneae: Lycosidae), all new records for northwestern Ontario, indicates that the invertebrate fauna in the area has been poorly studied. Roads and trails away from Fort Severn, regularly scheduled airline service, and convenient accommodations make the area ideal for biological studies.