SAC-BEARING LEPIDOPTERA. .37 



clathrella, Zell.* I also leave it undecided, whether that larger 

 sac already mentioned by me (p. 32), which, except in its size, 

 differed in nothing from the sacs of the female Psyche Helix, 

 does not belong to a caterpillar, which might have become 

 developed to a male individual of Psyche Helix f. 



* See Zeller's Beschreibung des m'dnnlichen und weiblichen Sackes dor Sole- 

 nobia clathrella, in the Linneea Entomologica, Band vii. 1S52, p. 345. See 

 also Fischer von Roslerstamm, Abbildungen zur Berichtigung und Erg'dnzvng 

 der Schmetterlitigskunde, p. 84. taf. 38. 



f [May not the Psyche Planorbis and the larger heliciform-sac, both from 

 Spain, be the male and female sacs of one species, and the mule sac of P. Helix 

 be also Planorbis-like, but smaller than the Spanish specimens? — W. S. D.] 



