Phil Rau.
The Differentiation of the Cocoons of Pelopæus cæmentarius and chalybion cæruleum.
Psyche 22:62, 1915.

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63 Psyche [April
THE DIFFERENTIATION OF THE COCOONS OF PELO- P(EUS CMMENTARIUS AND CHALYBJON C m -
LEUM (HYMEN.).
BY PHIL RAU,
St. Louis, Missouri.
A large number of mud-daubers' nests had been gathered for the purpose of a study of the contents of their cells. The nests appeared to be all of the same kind. While opening them, however, Fig. 1. I, Cocoona of Chdybwn wrvUum; 2, Cocoons of Pelopcms (KFTOCT~~U~~U~. we were for a time puzzled by a variation in the structure of the cocoon. Some of the cocoons were of a rich brown color and of papery consistency, with smooth surface as though glazed (Fig. 8) ; others were of a whitish color and of soft, webby texture Piy-ftf 2252 (19 IS). htlp:ffpsychc mclub.org/22/22-W2 him1



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