Variation in external dimensions of Lucunus cervus (L.) has been studied using 573 specimens of both sexes from one area over a period of 3 years.Allometric relationships between various parts of the body are calculated. The taxonomy of this very variable population is discussed.
Insects have developed highly sophisticated and sensitive olfactory systems to find animal or plant hosts for feeding. Some insects vector pathogens that cause diseases in hundreds of millions of people and destroy billions of dollars of food products every year. There is great interest, therefore, in understanding how the insect olfactory system can be manipulated to reduce their contact with hosts. Here, we review recent advances in our understanding of insect olfactory detection mechanisms, which may serve as a foundation for designing insect control programs based on manipulation of their behaviors by using odorants. Because every insect species has a unique set of olfactory receptors and olfactory-mediated behaviors, we focus primarily on general principles of odor detection that potentially apply to most insects. While these mechanisms have emerged from studies on model systems for study of insect olfaction, such as Drosophila melanogaster, they provide a foundation for discovery of odorants to repel insects or reduce host-seeking behavior.
The terms used in the descriptive morphology of phasmid eggs are compared and standardized, and a check list of all known figures of phasmid eggs is presented. The eggs of eleven species commonly reared in Britain are described. About 5 % of phasmid species are known from the egg stage.
The term capitulum is defined and a survey of the known eggs of the Phasmida is made to show the occurrence of this structure . Its value as a taxonomic criterion is considered .
CONTENTS
The morphology of seventeen samples of phylliine egg is described and figured, and an attempt is made to relate these egg forms to the alleged identity of the adult insects.
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