Arthropods bears short appendages, jointed legs containing most of the beetle species in the biodiversity. Beetles in the form of varied families in the phylum Arthropoda shows different mouth structures with abdominal forms. Red floor beetle (Tribolium castaneum) and confused floor beetle (Tribolium confusum) showed similar external appearance except antennal structure and smooth abdomen without any row of pits. Scanning electronic microscopic study of the dorsal and lateral view of the confused flour beetle shows varied numbers of sensilla. These sensilla types are viz., ST (Sensilla trichoidea), SC (sensilla chaetica), SB (Sensilla basiconica) and Amp (ampulacea). Antenna is clavate type and having 4 to 11 segments with widely separated antennal insertions, distance between them more than the length of first antennal segment. Antenna has four enlarged segments (antennal club) at the terminal end. Raw deep pits are present over the dorsal surface of the beetle. Scanning electronic microscopy is done under used the Lyzer Zoom Stereoscopic Microscopy, Trinocular model ZSM-3 Light microscope. SEM study observed specifically antennal sensilla segments with length in micrometer. Sensilla trichoidea typically innervated by one to several neurons can be solely mechanoreceptors, contact chemoreceptors, thermo sensitive, or olfactory in function. Sensilla chaetica responsible for mechanoreceptors or contact chemosenstive in function. Sensilla basiconica are short hairs (pegs) or cones that are innervated by one to several neurons. Sensilla ampullacea are positioned in deep pits with narrow openings and innervated by two to several neurons.