Nematode parasites of bark beetles (Scolytidae) in southern Manitoba, with descriptions of three new species of Sulphuretylenchus Rühm (Nematoda: Allantonematidae)

Thirty-one species of bark beetles were collected from nine genera of host plants at 29 locations in southern Manitoba during 1980–1983. Of these bark beetle species, 21 were infected by as many as 56 species of nematodes, based on examination of adult and juvenile stages. There were 30 species of allantonematids, all recovered from the hosts' haemocoel. Fourteen rhabditid species were recovered from the alimentary tract of 15 host species. Twelve aphelenchoids were found in both the haemocoel (of 10 host species) and the Malpighian tubules (of 2 host species). Three new species of Sulphuretylenchus are described. Sulphuretylenchus pseudoundulatus sp.nov. parasitized Polygraphus rufipennis (Kirby) collected in the Whiteshell Provincial Forest. Sulphuretylenchus nopimingi sp.nov. parasitized Pityokteines sparsus (LeConte) collected in Nopiming Provincial Park. Sulphuretylenchus posteruteri sp.nov. parasitized Ips perroti Swaine in the Belair Provincial Forest.

The Bark Beetle Complex Associated with Lodgepole Pine Slash in Alberta: Part III—Notes on the Biologies of Several Predators with Special Reference to Enoclerus sphegeus Fab. (Coleoptera: Cleridae) and Two Species of Mites

The most important predators found with broods of Ips pini (Say) and Ips perroti Sw. belong to the orders Coleoptera, Diptera, Hemiptera, and Acarina.Among the Coleoptera, Enoclerus sphegeus Fab. was the most aggressive and responsible for the greatest predation. The small clerid, Thanasimus undulatus Say, was present in the area but rarely encountered. Dipterous predators included Loachea corticis Taylor, Oscinella sp. nr. magnipalpus Beck. and Medeterus modestus Van Duzee. A hemipterous egg predator, Anthocoris musculus Fall. was found occasionally within the main Ips galleries.

The Bark Beetle Complex Associated with Lodgepole Pine Slash in Alberta: Part II—Notes on the Biologies of Several Hymenopterous Parasites

Representatives of the families Braconidae and Pteromalidae were present in association with broods of Ips pini Say and Ips perroti Sw. The identifications and information on distribution and hosts were kindly supplied by O. Peck and W. R. M. Mason of the Systematic Entomology Unit in Ottawa. Additional information on hosts and distribution were obtained from Hymenoptera of America by Muesebeck, Krombein, Towns, et al. (1951).