On a small collection of Odonata, chiefly collected in Northern India, by M. A. LlEFTINCK, Amsterdam. The following account is an enumeration of and a short discussion about a small, but interesting lot of Odoiiata, collected by Mrs and Dr W. G. N. VAN DER Sleen in 1926, during the months of June, July and September, chiefly in the mountain regions of Northern India. I am indebted to Mr J. B. CORPORAAL (Mus. of Amsterdam) for allowing me to examine these dragonflies, as the results proved to be of some interest, especially in dealing with the smaller species. The localities whence the insects came are situated in the Himalaya mountains, between Simla (2400 ft) and the boun-daries of Thibet (Sutlej-basin) and all were captured in the immediate vicinity of the Hindustan-Thibet-Road*. Thus, the Odonata, gathered together pending geological and ethnological inquiries, descend from a region, known as but little explored ; hence all records from these countries are of considerable interest. There are also three species from the extreme South of India, viz Travancore (10°). In dealing with the Libellulinae, I have pleasure in mentioning the assistance of Mr K. J. Morton (Edinburgh), who was kind enough to explain his views in respect to a remarkable species of Orthetriim. The types and other specimens will be deposited in the Museum of Amsterdam.