The crop is modified into a large and very rugose triturating apparatus, while the gizzard, thereby relieved of its function, is reduced to the utmost. [Please select]
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Shell fusiform, reddish brown, with whitish bands; smooth; spire plaited and striated; base rugose; pillar 4 plaited. [Please select]
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5 in males), narrower, and more rugose; zygomatic breadth less in females (averaging 42. [Please select]
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Each of the last two has a bony prepollex, rather rugose skin on the dorsum, and more squat body. [Please select]
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Each of the first two has a bony prepollex, rugose skin on the dorsum, and heavy body. [Please select]
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Black; the head and thorax finely rugose; the antennæ elongate, longer than the insect; the apical half of the flagellum pale ferruginous. [Please select]
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Abdomen aciculate as in the worker, but much more deeply strangulated between the first and second segments; the petiole rugose and clavate. [Please select]
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