. The Entomologist's record and journal of variation. lowersurface. On higher magnification, this proves to have a seriesof fine shallow spaced ridges. The cocoon is pale, and is attached dorsally within thegreen patch, not extending beyond its margin. It has nocontact with the lower epidermis, and the silken lower mem-brane of the cocoon is divided at its periphery into two outer layer is straight and stretches across to be attachedto the edge of the green patch, while the inner layer is domedand attached within this. The frass is situated compactlybehind the cocoon, without a silk
. The Entomologist's record and journal of variation. lowersurface. On higher magnification, this proves to have a seriesof fine shallow spaced ridges. The cocoon is pale, and is attached dorsally within thegreen patch, not extending beyond its margin. It has nocontact with the lower epidermis, and the silken lower mem-brane of the cocoon is divided at its periphery into two outer layer is straight and stretches across to be attachedto the edge of the green patch, while the inner layer is domedand attached within this. The frass is situated compactlybehind the cocoon, without a silken pad. It is difficult to be dogmatic about which species of oakis the primary foodplant for any particular species of Phyl-lonorycter, except P. messaniella whose first choice is Q. from our own observations we have only bred P. disten-tella, P. roboris, P. muelleriella and P. lautella from P. harrisella, P. quercifoliella and P. heegeriella werebred from Q. petraea and Q. robur. OBSERVATIONS ON THE MINES OF PHYLLONORYCTER 165. Fig. 2. Phyllonorycter roboris Zell. view on Quercus petraea. P»pJ <fc(n
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