THE AMERICAN MUSEUM JOURNAL 



3. Eocene Mammals. Mr. Walter Granger had charge of 

 this expedition, in southwestern Wyoming, and succeeded in 

 sending in a large and remarkably fine collection of these rare 

 fossils. The series is especially rich in the monkeys, rodents 

 and small carnivora of the Middle Eocene, which until now have 

 been very inadequately represented in our collections. 



4. Aliocene Mainnials. Mr. J. W. Gidley was in charge of 

 this expedition, in South Dakota, and obtained a fine skeleton, 

 nearty complete, of the Miocene ancestor of the camels, besides 

 a number of skulls and other fine specimens of extinct Horses, 

 Camels, Carnivores and Rodents of the Upper Miocene, which 

 will greatly add to our representation of these animals. 



5. Pleistocene Cave Mammals of Arkansas. This collection 

 is referred to on page 6. 



SOME EXTR.4.0RDINARY ANTS. 



IJHERE has just been placed on exhibition in the 

 Svnoptic Hall of the ^Museum a collection to illus- 

 trate the strange phenomena of gynandromorph- 

 ism, a subject considered by Professor W. M. 

 Wheeler, Curator of Invertebrate Zoology, in a 

 recent paper in the Bulletin ' of the Museum issued in December. 

 As the name indicates, a gynandromorph is an animal the body 

 of which is partly male and partly female. The male and female 

 characters may be either blended, as in the cases of male animals 

 with female coloring or sculpture, or mosaic, as in animals having 

 the body made up, as it were, of male and female pieces, just as a 

 mosaic pavement is composed of different pieces of marble. The 

 mosaic type of gynandromorphism is the more frequent, though 

 this is merely a relative expression, since all cases of g^mandro- 

 morphism are extremely rare. The six new cases of gynandro- 

 morphous ants described in Professor Wheeler's paper were found 

 only after examining many thousands of specimens during a 

 period of four vears. In most of the known cases of gynandro- 

 morphism, the body is divided into halves, one of which is male, 



I Bull. Am. Mus. Nat. Hist., vol. xix, Article xxix, pp. 653-683, 11 

 figures, 1903. 



15 



