Commonwealth Institute of Parasitology, 395a, Hatfield Road, St. Albans, England.
Aculonchus argutus gen.n.; sp.n., A. anaglyptus sp.n., A. afrirtinus sp.n. and Zetalaimus blepheronchus gen.n., sp,n. are described and illustrated. A. argutus and A. anaglyptus were collected in Colombian rain forest, and A. africanus and Z. blepheronchuS in forest soil in Nigeria. Aculonchus and Zetalaimus have solid odontostyle, a knob-like lip region and stoma enlarging within the lip region; the stoma of Zetalaimus is inverted thistle funnel-shaped; they belong to the subfamily Belonenchinae.
