puparium

/ pjuːˈpɛərɪəm /

noun

a hard barrel-shaped case enclosing the pupae of the housefly and other dipterous insects

The mode in which insects make their way out of the puparium differs in different orders.

Female puparium varying in colour; circular in outline, usually flat, sometimes rather convex; pellicles usually in the centre.

Female puparium circular, flat, brown; diameter, about 1/20in.

Male puparium rather longer than that of the female, the pellicle at one end; not carinated above.

Female puparium nearly circular, convex, greyish or brownish in colour, about 1/15in.

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