. Carnegie Institution of Washington publication. ONTOGENY OF LARVAL COLOR PATTERNS. MS pieces or pleurae, on all abdominal segments and on the prothoracic segments, are found the spiracular spots which are represented on the wing-bearing segments by the wing spots. Beneath these, on the abdominal segments, at the base of the pleurae, are one or, rarely, two basal tergal spots (text-figs. 7 and 8). On the sternae also a series of color centers is found corresponding to those of the tergae in that there are outer, middle, and inner areas, but these are rarely present as anterior and posterior s
. Carnegie Institution of Washington publication. ONTOGENY OF LARVAL COLOR PATTERNS. MS pieces or pleurae, on all abdominal segments and on the prothoracic segments, are found the spiracular spots which are represented on the wing-bearing segments by the wing spots. Beneath these, on the abdominal segments, at the base of the pleurae, are one or, rarely, two basal tergal spots (text-figs. 7 and 8). On the sternae also a series of color centers is found corresponding to those of the tergae in that there are outer, middle, and inner areas, but these are rarely present as anterior and posterior systems, although frequently in variations there are found strong indications of this anterior and posterior division. These areas continue forward in a homodynamic series over the thoracic segments. This system of color centers is not confined to the Coleoptera nor to a few families thereof, but is, I find, of most general occurrence among the Tra- cheates,and,as I shall show in another paper, is the fundamental pattern upon which all insect coloration is founded. With this system of color centers it. Tergum Pie inner tergal middle tergal at body ---outer tergal .-pSpiracula _ _baso-pleural â * canal ventral-nerve cha inner sternal! outer sternal middle sternal Text-figure 9.âDiagrammatic representation of a segment, showing the position of the different spots upon the sclerites which compose it. is a simple process to develop longitudinal stripes or transverse bars, or both, or combinations thereof. It would also be easy for the followers of Eimer to see in this a system of longitudinal stripes, and for others to see a system of transverse bars, as the fundamental color pattern. In truth, however, this system of color centers is neither of the latter; it is a metameric repetition of homodynamous areas, or modifications thereof, on every individual segment; and any other interpretation is warped in favor of some particular theory. It is true that the various elem
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