A total of 97 soil samples were collected from the rhizosphere of various crops grown in varied agro-climatic zones of Rajasthan during Rabi 2005. Out of these only six samples collected from wheat, rose, guava and forest trees yielded entomopathogenic nematodes belonging to genera Steinernema and Heterorhabditis. On the basis of morphological characters and body dimensions the population recovered seems to be different from already described species of Steinernema and Heterorhabditis. Hence, these were designated as race STSIRO of Steinernema and HMABU of Heterorhabditis.