CUTICULAR HYDROCARBONS OF THE HOST-SPECIFIC ECTOPARASITOID CEPHALONOMIA-STEPHANODERIS (HYMENOPTERA, BETHYLIDAE) AND ITS HOST THE COFFEE BERRY BORER (COLEOPTERA, SCOLYTIDAE)

Cuticular hydrocarbons have been identified from larvae and adults of the bethylid wasp Cephalonomia stephanoderis Betrem and larval, prepup al, pupal, and adult stages of its host, the scolytid beetle Hypothene mus hampei (Ferrari). Larval, male and female wasps have the same cuti cular hydrocarbons, but in different relative abundances, The major co mponents of adults are n-alkanes (C-21-C-33), monomethyl alkanes (3-, 5-, 7-, 9-, 10-, 11-, 12-, 13-, 14-, 15-, 16-, and 17-methyl), and Z-( 10)-monomethyl alkenes (with the methyl branch at C-11-C-16). Minor co mponents include a series of 3,X-; 4,X-; 5,X-; 6,X-; 7,X-, and 8,X-dim ethyl. alkanes (with X at C-14-C-19) and a series of 3,9,13- and 3,11, 15-trimethyl alkanes. Male C. stephanoderis are characterized by high proportions of n-alkanes and lower proportions of the monomethyl alkan es and methylbranched alkenes. Female wasps are characterized by lower proportions of n-alkanes and higher proportions of the monomethyl alk anes and methylbranched alkenes. Larval C. stephanoderis are character ized by high proportions of the methylbranched components and lower pr oportions of the n-alkanes and the n- and methylbranched alkenes. Host scolytid beetle cuticular hydrocarbons are totally saturated. Major c omponents of all stages and sexes include n-alkanes (C-22-C-31), monom ethyl alkanes (3-, 4-, 5-, 13-, 14-, 15-, 16- and 17-methyl), a series of dimethyl alkanes (3,7-; 3,9-; 3,15-; 3,17-; and 3,19-), and a seri es of trimethyl alkanes (3,7,13-; 3,9,13-; and 3,11,15-). Minor compon ents are a series of 4,14- and 4,16-dimethyl alkanes and 5,17- and 5,1 9-dimethyl alkanes. All immature beetle stages had similar hydrocarbon compositions, which differed moderately from those of the adults. As with the adult wasps, relative compositions of male and female beetles differed. Males were characterized by a greater proportion of n-alkan es and lesser proportions of monomethyl alkanes and trimethyl alkanes. Females had lesser proportions df n-alkanes and greater proportions o f monomethyl alkanes and trimethyl alkanes. Tile cuticular profiles of the parasitoid and host are compared and discussed in terms of both i ntraspecific and interspecific semiochemical interactions.