| 31. | The pupa is contained in an oval cocoon made of frass.
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| 32. | Pupation takes place inside a black, frass-covered ovate cocoon
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| 33. | The frass is black and deposited in an irregular central line.
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| 34. | Dorsally it is often covered with fragments of frass or detritus.
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| 35. | Most frass is deposited in the first part of the mine.
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| 36. | The frass is deposited in the first part of the mine.
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| 37. | The frass is light green at first but becomes grey later.
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| 38. | The frass is deposited in the oldest part of the mine.
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| 39. | Most frass is deposited in the oldest part of the mine.
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| 40. | Later, they spin a nest of silk webbing and frass.
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