Figure 2. Representative coupled gas chromatography-electroantennogram analysis of an extract of headspace odors from a female Desmocerus a. aureipennis.

Upper trace is the chromatogram, lower inverted trace is the electroantennogram signal from the antenna of a male beetle. Insert shows the GC and antennal responses to an authentic standard of (R)-desmolactone. DB-5 column, 40°C/1 min, then 10°C/min to 275°C, hold 40 min.