. Entomology for medical officers. Insect pests; Insects as carriers of disease. Fia. 128.—Female Itch-mite, ventral view. Fio. 129.—Female Sugar-mite, ventral view. actively locomotive insect, this being effected by a patch of suckers situated at the hind end of its body on the ventral surface. The Hypopus, which is exceedingly minute, has a hard chitinous integument and stumpy legs: it does not feed, having the piouth and its appendages quite vestigial. When it has been carried to some suitable locality, distant from its overpopulated birthplace, it again transforms at a moult into a nymph a
. Entomology for medical officers. Insect pests; Insects as carriers of disease. Fia. 128.—Female Itch-mite, ventral view. Fio. 129.—Female Sugar-mite, ventral view. actively locomotive insect, this being effected by a patch of suckers situated at the hind end of its body on the ventral surface. The Hypopus, which is exceedingly minute, has a hard chitinous integument and stumpy legs: it does not feed, having the piouth and its appendages quite vestigial. When it has been carried to some suitable locality, distant from its overpopulated birthplace, it again transforms at a moult into a nymph and resumes the even tenour of its development. The " Hypopus question" furnished abundant material for speculation, until Michael showed by experiment that it is an ordinary alternative developmental stage favourable to the spread of the species by Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Alcock, A. (Alfred), 1859-1933. London, Gurney & Jackson
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