. Entomology for medical officers. Insect pests; Insects as carriers of disease. SCORPIONS, SPIDERS, ETC. 295 the ventral surface of each of the next 4 segments there is a pair of breathing-slits {stigmata), each of which opens into a cavity containing a close-set series of gill-like leaves—the " ; All these structures are regarded as modified Fio. 130.—Ventral view of Scorpion. The 5 narrow segments that, with the post-anal spine, form the tail are more or less sculptured and faceted; the anus opens at the end of the 5th. None of these segments has appendages
. Entomology for medical officers. Insect pests; Insects as carriers of disease. SCORPIONS, SPIDERS, ETC. 295 the ventral surface of each of the next 4 segments there is a pair of breathing-slits {stigmata), each of which opens into a cavity containing a close-set series of gill-like leaves—the " ; All these structures are regarded as modified Fio. 130.—Ventral view of Scorpion. The 5 narrow segments that, with the post-anal spine, form the tail are more or less sculptured and faceted; the anus opens at the end of the 5th. None of these segments has appendages of any sort. The first pair of cephalothoracic appendages, or chelicer(e, are short and pincer-like, and are rather deeply embedded between the second pair. The latter, or pedipalps, are large prehensile organs composed of 6 segments, and resemble the great " claws " of a lobster. The next four pairs are crawling- fibialspun pedal spur Fia. 181.—Leg of Scorpion. legs. Each leg (Fig. 131) is composed of 7 segments and ends in a pair of claws. The coxse of the first two pairs of legs are produced anteriorly into maxillary processes (Fig. 130) which form a threshold to the mouth. At the end of the protarsus, or 6th segment of the leg, there is a spine, known as the pedal spur; sometimes two pedal spurs are 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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