Trogoderma variabile

Trogoderma variabile are small (0.3-0.6 cm in length), oval-shaped beetles that are dark in color with varying levels of yellowish banding on the elytra. 

Wright, E.J., Sinclair, E.A., and Annis, P.C. 2002. Laboratory determination of the requirements for control of Trogoderma variabile (Coleoptera Dermestidae) by heat. J. Stored Prod. Res. 38, 147-155. 

Cross, J. H., R. C. Byler, R. M. Silverstein, R. E. Greenblatt, J. E. Gorman, and W. E. Burkholder Sex pheromone components and calling behavior of the female dermestid beetle, Trogoderma variabile Ballion (Coleoptera Dermestidae). J. Chem. Ecol. 3,115—125 (1977). 

Four species of Trogoderma beetles use methyl-branched alkenals as their major sex pheromones 300). Aeration of T. gramrium and trapping of the volatiles on Porapak Q gave a 92 8 ratio of (Z)- to ( )-14-methyl-8-hexadecenal. The Z-isomer was the major component obtained from T. inclusum and T. variabile and the -isomer was obtained from T. glabrum. In laboratory bioassays males could discriminate between the geometric isomers. 

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