Ants were collected from lowland dipterocarp rain forest sur-rounding the Kuala Belalong Field Studies Centre (KBFSC),in the Temburong District of Brunei Darussalam (0432¢N,11510¢E). From the 16 COCY species present there, wechose to work with the small-bodiedCamponotus[Colobopsis]sp. ‘YG’ (‘yellow goo [product]’; voucher # DWD KB02-108, in the Natural History Museum of Los AngelesCounty). This species exhibited the highest frequency of gas-tral rupture in trials with forceps, and it has the greatestwhole-body ‘investment’ in product on the basis of concen-tration: weight (Cook 2008). Smaller-bodied ants alsopresent fewer barriers to histological study than do theirlarger-bodied counterparts.Body parts of workers were cut so as to expose tissuessufficiently to penetration ofchemicals used during tissueprocessing for histological examination.Cutsweremadetoobtain anterior heads, posterior heads (with prothoraxattached), posterior thorax (with petiole and anterior gasterattached) and posterior gaster. Tissues were fixed in cold2% glutaraldehyde, buffered at pH 7.3 with 50 mMNa-cacodylate and 150 mM saccharose and postfixed in2% osmium tetroxide in the same buffer. Dehydration wascarried out in a graded acetone series. Araldite-embeddedtissue blocks were sectioned with a Reichert Ultracut Emicrotome. Semithin 1-lm sections were stained with