STUDIES ON THE BIOLOGY OF INDONESIAN SCOLYTOIDEA 4. DATA ON THE HABITS OF SCOLYTIDAE. SECOND PART BY L. G. E. KALSHOVEN Blaricum, the Netherlands The present paper deals with the ambrosia beetles of the Scolytidae, the greater part of which belongs to the very extensive genus Xylebortis which has a lircumtropical distribution; the number of its species is steadily increasing. A large imount of work has already been done by the taxonomists on the subdivision of :his genus. Recently Schedl (1957) introduced 26 groups of African species, lesignating them as "Xylebori anisandri" and so on, and mentioning a type pecies for each. Similar groups, several of them identical with those in this sub-division, have also been mentioned in papers on the taxonomy of oriental Xyle-horus species by Eggers, Schedl and others. Moreover, I have seen a tentative irrangement of the Indomalayan species started in the British Museum (Natural History) by the late D. Atkinson. F. G. Browne has most kindly enlightened me ibout the preliminary arrangement which he uses in his collection. However, no diagnoses of the groups have been published so far, neither ;omplete lists of species have been given, nor is there a key for the determination of the groups. This was the reason why I failed in my attempt to subdivide the circa 50 species dealt with in the present paper into groups of Xylebori. Being averse to a sequence of species in a mere alphabetical order of their names, I preferred to use an unpretentious arrangement which at least shows some of the affinities between the species, and perhaps some trend in their mor-phological and ethological specialisation. Hereby I could make profitable use of the preliminary groupings, already more generally accepted and mainly based on features in the facies of the female beetles, and to a lesser extent, on the shape of the males for the still limited number of species where these have become ' known. In a very few cases indications of relationship may be observed, in the gallery pattern which is rather characteristic for some groups but again, far too incompletely studied, to be of much use. In the arrangement presented here the species following one another without a break are considered to be nearly related. No apparent close relationship is thought to exist between species preceding and following a — o — o-— , though in some cases they might be more or less allied. 135
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