. Carnegie Institution of Washington publication. 144 COLORATION IN LGrTINOTARSA. larvae of many Leptinotarsas (undecimlincata, decemlineata, signaticollis, etc.) we find color areas or centers which are represented diagrammatically in text- figure 7 as seen from the side, and in text-figure 8 as seen from above. An abdominal segment (text-fig. 9), which represents the simplest condition, shows the skeletal ring composed of paired tergae, pleurae, and sternae. Upon each of these are color centers which are placed in a constant morphological position and have definite relations to the structure
. Carnegie Institution of Washington publication. 144 COLORATION IN LGrTINOTARSA. larvae of many Leptinotarsas (undecimlincata, decemlineata, signaticollis, etc.) we find color areas or centers which are represented diagrammatically in text- figure 7 as seen from the side, and in text-figure 8 as seen from above. An abdominal segment (text-fig. 9), which represents the simplest condition, shows the skeletal ring composed of paired tergae, pleurae, and sternae. Upon each of these are color centers which are placed in a constant morphological position and have definite relations to the structure of the animal. Upon the tergum are found on either side of the median line three pairs of color centers divided by a crease or furrow into two series. These are designated the outer, middle, and inner tergal centers, and they exist as an anterior and posterior series (text-figs. 7 and 8). Each of these centers may consist of one, two, anterior median pronotal spot posterior median pronota) spot Inner tergale. anterior lateral epicranial ** ^-posterior lateral epicranial __aoterior pronotal band â. â â â â â â -posterior pronotal band _ _ _ â ââ-outer tergal â â. middle tergal wing spots &â apiracula eplracula â ââanterior tergal band "*"â â¢â -âposterior tergal band Text-figtjrb 8.âDiagrammatic representation of the color centers shown in text-figure 7 when seen from the dorsal side. or three small, closely placed spots, and in many species they are the locations of spines. This type of coloration is found not only upon all the tergae of the abdominal segments, but also upon the last two thoracic tergae. Upon the anterior thoracic tergum or pronotum, however, there appear in the larvae the anterior and posterior pronotal bands (text-figs. 7 and 9),which are homo- dynamous with the anterior and posterior tergal system of centers of the pos- terior segments. This same type, further obscured, is seen in the epicranium, where there exist the ant
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