Taxonomic studies on genus Tetramorium Mayr (Hymenoptera, Formicidae) with report of two new species and three new records including a tramp species from India with a revised key

Abstract. Two new species of Tetramorium Mayr, namely Tetramorium shivalikense sp. n. and Tetramorium triangulatum sp. n. are described. Tetramorium triangulatum sp. n. belongs to the inglebyi-species group and is described based on worker, queen and male caste, while Tetramorium shivalikense sp. n. belongs to the ciliatum-species group and is described based on worker caste only. Three species viz., Tetramorium caldarium (Roger), Tetramorium tonganum Mayr and Tetramorium urbanii Bolton represent first records from India. The male caste is described for the first time in the case of Tetramorium tonganum. Among these, Tetramorium caldarium is a tramp species which extends its limit to India as well. A revised key to the Indian ants of this genus is also provided herewith.