Campos Pereira, MoniqueCooper, Paul2021-02-212021-02-211536-2442http://hdl.handle.net/1885/223654We describe a pair of labial gland lobes on either side of the retrocerebral complex in the head of the Australian black field cricket, Teleogryllus commodus Walker. As the retrocerebral complex includes the corpora cardiaca and corpora allata, hormones secreted by these glands can be absorbed by these lobes. These lobes of the labial gland are connected to the thoracic lobes via a relatively long duct that enters the main duct draining the thoracic lobes. Measurement of the flow rate of dye from head to thorax in the ducts is rapid, suggesting that these glands may serve as a transport system into the thoracic region. Both serotonin and adipokinetic hormone are shown to be present in the lobes near the retrocerebral complex and the ducts of the thoracic lobes, but whether this connection between the head and thorax acts as a hormone transporter is still unclear.M.C.P. was supported by a scholarship from CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior). We appreciate the help of Tim Senden and Michael Taylor of ANU for their help with the microcomputer tomography. Sharyn Wragg of our department kindly drew the diagram for Fig. 2C. The work was supported from funding supplied to P.D.C. from the departmental funds of the Research School of Biologyapplication/pdfen-AU© The Author(s) 2020. Published by Oxford University Press on behalf of Entomological Society of Americahttp://creativecommons.org/licenses/by/4.0/retrocerebral complexcorpora cardiacacrickethormonescirculation202010.1093/jisesa/ieaa0682020-11-08Creative Commons Attribution License