Table 1.

Chemical composition of the secretion of A. compressa larvae and mean amounts and respective proportions of larval compounds found on single P. americana hosts parasitized by A. compressa (n = 10)

No.	LRI	Compound	Larval secretion	Amount per cockroach (µg)	Proportion (%)
1	1,550	(R)-(-)-mellein*	+	1,900 ± 1,442	87 ± 5
2	1,660	7-Hydroxymellein†	+	54 ± 110	1.3 ± 3.0
3	1,713	4-Hydroxymellein†	+	24 ± 21	1 ± 0.3
4	1,878	5-Hydroxymellein†	+	1.7 ± 5	0.04 ± 0.14
5	2,107	(R)-Hexadecan-4-olide‡	+	6.5 ± 7	0.22 ± 0.17
6	2,207	Heptadecan-4-olide§	+	0.6 ± 1.2	0.01 ± 0.03
7	2,273	Octadeca-9,12-dien-4-olide§	+	10 ± 9.2	0.46 ± 0.23
8	2,284	(4R,9Z)-octadec-9-en-4-olide/micromolide‡	+	216 ± 205	8.6 ± 3.8
9	2,313	(R)-octadecan-4-olide‡	+	41 ± 43	1.5 ± 0.8

The two major compounds are in boldface type. Numbers correspond to the numbers in Fig. 2. LRI, linear retention index (calculated in relation to n-alkanes); +, compound is present in larval secretion. Values are means ± SD.

*Identified by comparing the mass spectrum, retention time on a nonpolar GC column, and optical rotation value with a synthetic reference compound.

^†Tentatively identified by comparing the mass spectrum with published mass spectra (SI Materials and Methods).

^‡Identified by comparing the mass spectrum and retention times on a nonpolar and an enantioselective GC-column with a synthetic reference compound.

^§Tentatively identified by interpretation of the mass spectrum (SI Materials and Methods).