. Annals of the Entomological Society of America. Entomology. 1918] Segmentation of Abdomen of Bee The presence of a telson or anal segment in insects seems to be well established on the evidence afforded by the Odonata and Ephemerida, as well as on theoretical grounds (Heymons 1896). The abdomen of the honeybee may therefore be con- sidered as consisting of 12 segments. There is, however, in the honeybee embryo some direct evidence indicating the presence -GngI. Gng9.!l Fig. 2. Nervous sj^stem of mature larva. Br, brain; Gng 1-11, abdominal ganglia 1-11. Abdominal segments indicated by numera
. Annals of the Entomological Society of America. Entomology. 1918] Segmentation of Abdomen of Bee The presence of a telson or anal segment in insects seems to be well established on the evidence afforded by the Odonata and Ephemerida, as well as on theoretical grounds (Heymons 1896). The abdomen of the honeybee may therefore be con- sidered as consisting of 12 segments. There is, however, in the honeybee embryo some direct evidence indicating the presence -GngI. Gng9.!l Fig. 2. Nervous sj^stem of mature larva. Br, brain; Gng 1-11, abdominal ganglia 1-11. Abdominal segments indicated by numerals. From camera drawing of a dissection. of an anal segment. At Stage XII (text Fig. lA) the ventral hypodermis just cephalad of the proctodaeum is indented inter- nally by a deep notch or transverse groove, internally by a shallower one, directly opposite to one another and reducing the intervening hypodermis to one layer of cells. These notches may readily be interpreted as corresponding to intersegmental constrictions and therefore as marking the limits between the 11th abdominal and anal segments. Vestiges of this separation are also to be seen in later stages, but disappear by the time embrj'onic development is 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 Entomological Society of America. [College Park, Md. , etc. ] : Entomological Society of America
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