. Outlines of zoology. Zoology. SCORPIONWJE. 323 from a branchiate form, and have acquired their trachea independently; apart from the trachea, few structural resemblances to Insects are apparent. Order 1. Scorpionim:. Scorpions are elongated Arachnoids, restricted to warm countries, lurking under stones or in holes during the day, but active at night. The Scorpio afer of the East Indies attains a length of 6 inches, but most are much smaller. They feed on insects, spiders, and other small animals. The "tail," with the venomous sting at its tip, is usually curved over the anterior pa
. Outlines of zoology. Zoology. SCORPIONWJE. 323 from a branchiate form, and have acquired their trachea independently; apart from the trachea, few structural resemblances to Insects are apparent. Order 1. Scorpionim:. Scorpions are elongated Arachnoids, restricted to warm countries, lurking under stones or in holes during the day, but active at night. The Scorpio afer of the East Indies attains a length of 6 inches, but most are much smaller. They feed on insects, spiders, and other small animals. The "tail," with the venomous sting at its tip, is usually curved over the anterior part of the body, and can reach forward to kill the prey caught by the anterior appendages, or can be suddenly straightened to strike back- wards. When man is stung, the poison seems to act chiefly on the red blood corpuscles, and, though never or very rarely fatal, may cause much pain. It has been said that scorpions commit suicide when sur- rounded by fire or otherwise fatally threatened, but it has been answered that they do not sting themselves, that they could not if they would, and that, even if they could, the poison would have no effect! The body is divided into—(1) a cephalothorax or "pro- soma" of six segments, whose terga fuse into a carapace, and (2) an abdomen, which includes a broad seven- segmented " mesosoma," and a narrow five-segmented " ; At the end of the latter there is a post-anal curved spine or " telson," containing a paired, compressible poison gland opening at the sharp tip. There is a strong. Fig. 140.—Scorpion. Chelicerse; pp., pedipalps; o., genital operculum; p., pectines; s., stigma of a lung-book on the pre-abdomen ; st., sting or post- anal 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 Thomson, J. Arthur (John
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