X WATER-BOATMEN 361 



contain about two thousand eggs. The fossil eggs 

 were probably laid in water, like those of the Mexican 

 Corixae, and it is not unlikely that the lakes of 

 Mexico may hereafter yield masses of fossil eggs 

 like those of the Laramie beds.^ 



1 Scudder, " Tertiary Insects of North America," i/.S. Geo/. 

 Siirv. of tlie Territories., 1890. 



