Division of Nematology, Indian Agricultural Research Institute, New Delhi-110012.
* Part of the thesis submitted by the senior author for the award of Ph.D degree to P.G. School, I.A.R.I., New Delhi in 1978.
Four new tylenchid nematodes collected from Vidarbha region of Maharashtn are being described and illustrated. Helicotylenchus gratus sp.n. is distinctive by having L=0.75 0.90 mm, lip smooth conoid truncate, m=46–52. spear=25–27 μm and short hemisperical tail with 14–18 annules; H. ventroprojectus sp.n. by having smooth conoid truncate lip region, spear knobs anteriorly indented, tail with 12 annules, notched ventrally with a projection; Macroposthonia crassiorbus sp.n. by having L=0.40–0.50 mm, body annules with serrated margins, first annule not broken into platelets and first two annules anteriorly and outwardly directed; Basiria elegans sp.n. is characterized by L=0.50–0.70 mm, orifice of dorsal oesophageal gland about 3–5 μm from spearbase, post-uterine sac about one vulval-body-width long, spicula measuring 13 μm long and phasmids 3 anal body widths posterior to anal latitude.
