. Bulletin of the Natural History Museum Geology. with a pair of apical spurs; only one spur is visible on the fore tibia. First tarsomere times longer than second one. Measurements. Total length of inclusion = mm; antenna length = mm (two last flagellomeres combined = mm), pedicel diameter = mm, head width = mm, width between eyes = mm; thorax length = mm, thorax width = mm, wing width (on level of anal vein apex) = mm, fore femur = mm, fore tibia = no less than mm, fore tarsus = mm, middle femur = no less than 0
. Bulletin of the Natural History Museum Geology. with a pair of apical spurs; only one spur is visible on the fore tibia. First tarsomere times longer than second one. Measurements. Total length of inclusion = mm; antenna length = mm (two last flagellomeres combined = mm), pedicel diameter = mm, head width = mm, width between eyes = mm; thorax length = mm, thorax width = mm, wing width (on level of anal vein apex) = mm, fore femur = mm, fore tibia = no less than mm, fore tarsus = mm, middle femur = no less than mm, middle tibia = mm, middle tarsus = mm, hind tibia = mm, three proximal hind tarsomeres = mm. Remarks. Distinct from C. breviusculus in the larger size, wider wings, all leg joints dark, ratio of the first tarsomere to the second one, shape of tergites and, possibly, in the number of tibial spurs. Because of the last feature some doubts remain about the generic affinity of this species. Fig. 5 IChaoburmus victimaartis Lukashevich, , holotype NHM , male in Burmese amber. aligned with r-m. Haltere without conspicuous setae: pedicel trans- lucent, bare; capitulum entirely uniformly dark (presence of very short pile cannot be excluded). Parascutellar (postalar) setae present. Tergites are subquadrate. All leg joints dark. Middle and hind legs Acknowledgements. I am indebted to Mr Ross (Natural History Museum, London) and Dr Rasnitsyn (Paleontological Institute, Russian Academy Sciences, Moscow) for a possibility to work with Burmese amber; Dr V. V. Zherikhin for help in bibliographic search and Dr Shcherbakov (both Paleontological Institute) for discussions; Dr (Univer- sity, Gdansk) for critical reading of the manuscript; and Peter York (NHM) for Figs 6a-d IChaoburmus victimaartis Lukashevich, , holotype NHM , male in Burmese amber: a - total view, b - head
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