Observations on the developmental biology and adult behavior of Zeteticontus utilis, an endoparasite of Carpophilus spp., are presented. Ovarian dissections indicated that females carry 50 - 80 ovoid, stalked eggs at emergence. Eggs in the ovaries measured 0.16 mm by 0.07 mm, and increased in size ca. two-fold within 60 h of deposition. Four larval instars were observed. Pupation occurred approximately eight days after oviposition. Males emerged 21 - 22 days after oviposition, and females after 22 - 24 days. Zeteticontus utilis females were determined to be arrhenotokous, and both sexes engaged in multiple matings. Host odors and movement appeared to play a role in host suitability.

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