Mating behavior in a Texas population of the glassy-winged sharpshooter, Homalodisca coagulata was studied in the laboratory. Males emit spontaneous vibrational signals consisting of a low frequency whine followed by a series of pulses. A receptive female responds forming a duet with a signaling male and the exchange of signals continues until the he locates her. This overall pattern of behavior is similar to that found in other leafhoppers. The relationship between male size and signal characteristics will be discussed. Disturbed males also emit a signal that differs from their mating signal as they reassemble on a plant. Ongoing experiments will determine whether this is an aggregation signal.