. A manual for the study of insects. Insects. 12 THE STUDY OF INSECTS. except the Myriapoda in having many (more than four) pairs of legs. The illustrations named above are the more conspicuous members of the class; but many other smaller forms abound both in the sea and in fresh water. Some of the more minute fresh-w^ater forms '^ â are almost sure to occur in any fresh- FiG. 4.âCrustacea : a, Cypris: b^ , _,. Cyclops: c^Daphnia. watcr aquarmm. in i^igure 4 are represented three of these, greatly enlarged. Among the Crustacea that live in damp places on land the Sow-bugs, Omscidce (O-nis'ci-d
. A manual for the study of insects. Insects. 12 THE STUDY OF INSECTS. except the Myriapoda in having many (more than four) pairs of legs. The illustrations named above are the more conspicuous members of the class; but many other smaller forms abound both in the sea and in fresh water. Some of the more minute fresh-w^ater forms '^ â are almost sure to occur in any fresh- FiG. 4.âCrustacea : a, Cypris: b^ , _,. Cyclops: c^Daphnia. watcr aquarmm. in i^igure 4 are represented three of these, greatly enlarged. Among the Crustacea that live in damp places on land the Sow-bugs, Omscidce (O-nis'ci-dae), are most often' seen. These frequently occur about water-soaked wood ; and are often mistaken, by students begin- ning the study of Entomology, for insects or Myria- pods. Figure 5 represents a Sow-bug. On the sea-coast an immense number of forms sow-bug. of Crustacea occur. Class Arachnida (A-rach'ni-da). Scorpions^ Harvestmen, Spiders^ Mites^ and others. The members of this class are air-breathing A rthropods, in which the head and thorax are grown together, forming a cephalothorax, which have four pairs of legs fitted for walk- ings and which have no antertnce. The Arachnida abound wherever insects occur, and are often mistaken for insects. But they can be easily distin- guished by the characters given above, even in those cases where an exception occurs to some one of them. The more important of the exceptions are the following: In the Sol- pugida the head is distinct from the thorax; as a rule the young of mites have only six legs, but a fourth pair are added during growth; and in the gall mites {Phytoptus) there are only four legs. In the Arachnida we find only simple eyes. The cephalothorax (ceph-a-lo-tho^rax) bears six pairs of. 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 Comstock, John He
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1895
