Catalogue of the hymenopterous insects collected at Sarawak, Borneo; Mount Ophir, Malacca; and at Singapore, by A. R. Wallace. Author Smith, F. text Journal of the Proceedings of the Linnean Society of London, Zoology 1857 2 42 88 http://antbase.org/ants/publications/2588/2588.pdf journal article 2588 D09C3FFA-7EB5-4A2D-A55E-A3229619A2A2 6. Xylocopa Dejeanii . St. Farg. Hym. ii. p. 209. Hab. Borneo, Java. This I have little doubt is the male of X. collaris : I have on several occasions observed that they have been captured at the same time and place.