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Show 1900.] ON THE INSECTS OF T H E " SKEAT EXPEDITION." 837 deposited here and there in the cage of a female Marten, a sign her being in season, which I first observed some years ago in the case of Otters. Accordingly a male was admitted from the adjoining cage on January 5th ; shut off again on the 16th, but readmitted the next day, aud the pair were finally separated on the 18th. Pairing probably took place on the nights of the 8th, 10th, and 13th, though quite possibly at other times also. Young, which proved to be two males, were born early on April 22nd; and by the end of July they were already bigger than their mother. The probable period of gestation of this species is therefore a few hours over 103 days, the extremes of possibility ranging from 94 to 106 days. Beyond certain contributions towards determining the gestation of the Badger, among which I would specially refer to that of Mr. E. G. Meade-Waldo (' Zoologist,' 1894, p. 221), and the common statement that the Ferret " goes about six weeks," I know of no published record of tbe gestation of any of the Mustelidce, except in the case of two species in my own experience, viz.: Otter, 61 days (cf. P. Z. S. 1881, p. 249 ; ' Zoologist,' 1882, p. 201); and Polecat, 40 days ('Zoologist,' 1891, p. 344). Although I had long suspected that the gestation of the Pine-Marten must be a good deal longer than that of the Polecat, yet the actual state of the case was unexpected, and is certainly remarkable. 2. Observations on the Habits and Natural Surroundings of Insects made during the " Skeat Expedition" to the Malay Peninsula, 1899-1900. By N E L S O N A N N A N D A L E, B.A.1 [Received May 11, 1900.] CONTENTS. I. Introduction, p. 837. II. Flower-like Mantidee, p. 839. III. Another Harpagid Pupa, p. 848. IV. Alarming Colour and Attitude, p. 854. V. Sounds produced by Insects, p. 859. VI. Insect Luminosity, p. 862. VII. The Use of the Spines of certain Orthoptera, p. 86b\ VIII. The peculiar Prolongation of the Head in certain Fulyorida, aud its use, p. 866. I. INTRODUCTION. The observations which form the subject of this paper were made in the months of April to September, 1899, while I was a member of Mr. W . W . Skeat's expedition to tbe Siamese Malay States. I take this opportunity of expressing my thanks to the University of Cambridge for permitting me to join that expedition as a 1 Communicated by Prof. E. B. POUI/ION, F.R.S., F.Z.S. 55* |