Instars in the Carpenterworm, Prionoxystus robiniae

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The number of larval instars of Prionoxystus robiniae (Peck) varied even within broods reared under the same conditions, but it appeared to be influenced by sex and possibly by heredity and temperature. Instar numbers ranged from 8 to 31 and mean head-capsule widths from 0.96 to 6.65 mm. Head-capsule widths of males and females were about equal during the early instars, but generally they became increasingly larger for females. Variability notwithstanding, the early instars could be satisfactorily separated by head widths. Growth did not fit Dyar's rule (1890 Psyche, vol. 5) of geometrical progression, but rather it increased at a decreasing rate through Instar 7 and then leveled off near a ratio of 1.00.

Document Type: Research Article

Publication date: November 15, 1973

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  • Annals of the Entomological Society of America is published in January, March, May, July, September, and November. Annals especially invites submission of manuscripts that integrate different areas of insect biology, and address issues that are likely to be of broad relevance to entomologists. Articles also report on basic aspects of the biology of arthropods, divided into categories by subject matter: systematics; ecology and population biology; arthropod biology; arthropods in relation to plant diseases; conservation biology and biodiversity; physiology, biochemistry, and toxicology; morphology, histology, and fine structure; genetics; and behavior.
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