Abstract
Parasitylenchusstipatus and Parasitaphelenchusdendroctoni, internal parasites of Dendroctonus adjunctus Blandford, are described and illustrated. The life cycle of each was found to be synchronized with the host, which is a primary pest of ponderosa pine in the Southwest. Twenty-five other neniatode species were found associated with D. adjunctus. Of these, 16 are merely listed, while 9 are described and illustrated as new: GERTHORNUS balaenus,Mikoletskyacervicula,Mononchoidesadjunctus, Santafeadamalis,Scinurapini,Laimaphelenchuspannocaudus,L. pensobrinus,Bursaphelenchuscorneolus, aid Pseudhalenchusdamnatus.

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