. Elementary entomology . Fig. 29. Ovipositor of periodical cicada At rest at A, and exserted at B called ccrci, are frequently found attached to the tenth abdominal segment. They are quite variable in length, but in May-flies are as long as the body and resemble very slender antennae projecting backward from the abdomen. In most cases they are tactile organs, but in the cockroach they assist in smelling. The number of visible abdom- inal segments varies from five to eleven in different orders, and fre- quently the number is different on the upper, or dorsal, and under, or ventral, sides. The
. Elementary entomology . Fig. 29. Ovipositor of periodical cicada At rest at A, and exserted at B called ccrci, are frequently found attached to the tenth abdominal segment. They are quite variable in length, but in May-flies are as long as the body and resemble very slender antennae projecting backward from the abdomen. In most cases they are tactile organs, but in the cockroach they assist in smelling. The number of visible abdom- inal segments varies from five to eleven in different orders, and fre- quently the number is different on the upper, or dorsal, and under, or ventral, sides. The structure of the anal segments is usually different in the sexes and furnishes impor- tant characters for classification. Integument. Before studying the internal anatomy, the skin, or integument, of the insect should be considered. This has become hardened so that it forms a firm outer skeleton, to which the mus- cles and internal organs are attached. Thus the parts of the insect skin, as have been described, are analogous to the bony skeleton
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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912
