THE ENTOMOLOGIST. 43 



Zool. vol. xvii. p. 470) is smaller than that of the female, and 

 somewhat different in form. The larva itself is very similar 

 in the two sexes, while, on the contrary, the pupae differ 

 considerably. Prof. Clauss gives a description and figure of 

 the male, and whatever doubt may attach to the supposed 

 discovery of this sex by other observers, we may now, I 

 think, congratulate omselves that the male of this curious 

 species has been at last discovered. 



^'99 of an Ephemera. — M. F. Ratzkl, also in the ' Zeits- 

 chrift,' publishes a short paper on the egg of an Ephemera. 

 He describes and figures two curious hemispherical append- 

 ages which are attached to their flat sides, one to each end of 

 the egg. Leuckart, in his celebrated memoir, " Ueber die 

 Micropyle und den feineren Ban der Schalenhaut bei den 

 Insecteneiern," had already observed a somewhat similar 

 appendage to the eggs of the Ephemeras examined by him, 

 as indeed Swammerdam had also done long before ; but he 

 considered it to be a mass of spermatozoa, one end of which 

 was engaged in the micropyle opening. M. Katzel has, 

 however, observed the formation of the appendages in the 

 ovary, which proves that they belong to the eg^ itself. The 

 eggs examined by M. Ratzel have another curious pecu- 

 liarity. A number of fibrous cords, each ending in a circular 

 disk, are attached to the egg along two zones, which divide 

 it into three subequal parts. He suggests that the object of 

 these curious structures is to prevent the eggs from being 

 carried away by the current, 



Leaf-Insect of the Maple. — The * Comptes Rendus ' for 

 June last contain an interesting paper by MM. Balbiani 

 and SiGNOEET, on Periphyllus testudinatus. This insect, 

 known here as the leaf-insect or brown Aphis of the maple, 

 was discovered by Mr. Thornton in 1852, and described 

 under the name of Phyllophorus testudinatus. In 1858 Mr. 

 Lane Clark changed the generic name to Chelyraorpha, 

 Phyllophorus having been already used. Chelymorpha, 

 however, is in the same position, and M. Van der Hoeven 

 therefore replaced it by Periphyllus. The insect is a minute 

 form of Aphis, about one twenty-fifth of an inch in length, 

 flat, and brown. It is characterised by " the extraordinary 

 development and unusual appearance of the tegumentary 

 system. Thus their surface is no longer furnished only with 



