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WILLIAM MORTON WHEELER. 



but that the difference in the basal incrassation is not so striking 

 when the parts are seen from the side. The shapes of the cross- 

 sections of the bases of the two femora, nevertheless, show that 

 the Gigantiops femur is much more voluminous and therefore 

 capable of furnishing attachment for a much larger and more 

 powerful extensor muscle, as in the crickets and grasshoppers. 



FIG. 3. Female of Harpegnathos saltator Jerdon (after Mayr.). a, dorsal 

 view ; b, lateral view ; c, head of same from above. 



Extraordinary feats of leaping are performed by the species of 

 Harpegnathos, a genus confined to Indochina and the Philippines. 

 In these ants (Fig. 3) the structure of the head is very singular, 

 the eyes being very large, larger, in fact, than in any other 

 Ponerine, and placed very far forward, and the mandibles are 

 quite unlike those of any other known species. They are very 

 long, separated at the base but approximated, arcuately curved 

 upward, and gradually tapering toward their tips and finely serrate 

 along their inner borders. Each is provided at the base with a 

 large, flat, triangular tooth, projecting inward and somewhat 

 downward and backward. In cabinet specimens the blades of the 

 mandibles are applied to one another and the basal teeth overlap. 

 The leaping habits of this insect have been observed by Lefevre, 



