Annals of tropical medicine and parasitology . s are based upon fragments of the lobeswhich were broken up, in the first instance, in order to study the • Captured by Dr. J. Schwetz, Belgian Congo, \^\\. to whom I am much indebted forextensive collection? of these insects. lOO integumental character. No very exact particulars of the respiratorysystem can therefore be given, but I may add that it was theexamination of these dissections that led to the discovery of theremarkable respiratory character of the lobes. The larva in questionwas collected by the late Dr. J. Everett Button and Dr. J. L.
Annals of tropical medicine and parasitology . s are based upon fragments of the lobeswhich were broken up, in the first instance, in order to study the • Captured by Dr. J. Schwetz, Belgian Congo, \^\\. to whom I am much indebted forextensive collection? of these insects. lOO integumental character. No very exact particulars of the respiratorysystem can therefore be given, but I may add that it was theexamination of these dissections that led to the discovery of theremarkable respiratory character of the lobes. The larva in questionwas collected by the late Dr. J. Everett Button and Dr. J. L. Toddduring their expedition to the Congo Free State in 1904,unfortunately I cannot give its exact specific determination, but it isprobably referable to G. fusca, Walker. There can, however, be nodoubt that it belongs to the Fusca Group of tsetse-flies as definedby me m the Bulletin of Entomological Research (1911); beyond thisit is not safe to go, as several closely-allied species occur in theCongo Free State whose larvae await Fig. 3. Ghssiiia ? jtisca : cJ. r., tessellated dermal cells of abdomen of lar\-a (froma stained preparation) ; lr. int., distal or terminal portion of trachealtrunk with digit-like lateral tubes connected with the stigmata ;a. sc, air sac, showing the lateral tubes connected \vith a row ofstigmata. Polypneustic lobes. Stigmata circular or ovate arranged, moreor less in groups or loop-like series numbering from fourteen tosixteen in each; in places also in definite straight lines or single rows(fig. 3, a. s.), the respective rows being widely separated. These loop-like groups are connected with relatively short, stout tubes(tracheae) which branch off from the main trunk, so that when thesestructures are dissected out with the distal end of the tracheal trunkintact they appear distinctly dactyliform in character (fig. 3, /;-. tru.).The walls of the tracheal trunks and tubes are strongly and lOI irregularly reticulated, with the exception o
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectparasites, bookyear19
