Notes on Southeast Asian Stingless Bees of the Genus Tetragonula (Hymenoptera: Apidae), with the Description of a New Species from Thailand Author Engel, Michael S. Charles D. Michener, & Division of Invertebrate Zoology, American Museum of Natural History; Division of Entomology, Natural History Museum, and Department of Ecology & Evolutionary Biology, University of Kansas. Author Michener, Charles D. Charles D. Michener, & Division of Invertebrate Zoology, American Museum of Natural History; Division of Entomology, Natural History Museum, and Department of Ecology & Evolutionary Biology, University of Kansas. & Deceased, 1 November 2015. Author Boontop, Yuvarin Insect Taxonomy Group, Department of Agriculture, Bangkok. text American Museum Novitates 2017 2017-12-06 2017 3886 1 17 http://www.bioone.org/doi/10.1206/3886.1 journal article 5845 10.1206/3886.1 af0796d2-af76-4e84-baad-859243e59825 0003-0082 5062278 9BDC87F0-175C-4897-95B4-11F29EC99738 Tetragonula ( Tetragonula ) sarawakensis ( Schwarz, 1937 ) Trigona sarawakensis Schwarz, 1937: 313 . Cotype workers (AMNH, examined by M.S.E. and C.D.M.). Trigona (Tetragona) sarawakensis var. sarawakensis Schwarz ; Schwarz, 1939: 106 . Tetragonula sarawakensis (Schwarz) ; Moure, 1961: 210 . Trigona ( Tetragonula ) sarawakensis (Schwarz) ; Sakagami, 1978: 210 . Since this is not a well-known species, we include below notes based on a series of workers in the AMNH, two labeled as cotypes, and include comparative information on T . malaipanae in brackets. DESCRIPTIVE NOTES: Setae of clypeus and lower face minute, minutely if at all plumose, not at all hiding smooth surface [broadly plumose, partially hiding surface which shows some punctation]; tegula ferruginous [dark testaceous, sometimes grading to dusky especially near inner margin]; mesoscutellum with posterior extremity (overhanging propodeum) with transverse yellow mark (sometimes ferruginous, perhaps artificially darkened in such instances owing to method of collection or changes resulting from long-term preservation) [no such mark or if mark recognizable, testaceous or dusky]; legs ferruginous [usually dull ferruginous or brown with dusky areas at least on meso- and metatibiae]; setae of legs whitish or yellowish, sometimes a few dusky setae on tibiae and basitarsi [some setae on tibiae and basitarsi dusky or blackish, large simple setae arising from corbicular surface black or dusky although marginal setae largely or partly yellowish]; metasoma entirely ferruginous [dusky brown to testaceous]. MATERIAL EXAMINED (7⚲⚲): 1⚲ [cotype], Sarawak , Mt. Dulit , 4000 ft , moss forest, 18.x.1932 [ 18 October 1932 ], Oxford Univ. Exp. B.M. Hobby & A.W. Moore ( AMNH ) ; 1⚲ [cotype], same data as preceding specimen except 19.x.1932 [ 19 October 1932 ] ( AMNH ) ; 5⚲⚲, Mt. Tibang [Mount Tibang, Sarawak , near border with Kalimantan], 1300 m , Borneo, Nov. 1925 , Eric Mjöberg ( AMNH ) .