INTEOBUCTIOX. xiii 



Genus 3. BIBLTS. 



Nest. Of mud, placed against a rock or wall of a Ijuilding. 

 Eggs. White, with rufous or hrown spots. 



Genus 1. TACHYCIXETA. 



Nest. In holes of trees or stumps, more rarely ia holes of cliffs. 

 Eggs. Pure white. 



Genus 5. PHEDIXA. 



Nest. In holes of caves or rocks. 



Eggs. White, with rufous or hrown spots. 



Genus 6. IIIRrXDO. 



Nest. Of mud, straws, grass, &c., lined with feathers, in harns or on lieams of 

 buildings, more rarely against walls or cliffs. 



Eggs. White, Avith reddish spots. 



The ahove characteristics belong to the Ti'ue Swallows [RiridnJo] only, and it is 

 quite possible that the future systematist will sub-divide our genus Uirniulu. 



There would be some justification for this sub-division. Kirundo diiiuillciln is 

 said to lay white eggs, like Tachyciiieta. Hlr/iiuto n/grita nests in tree-stumps in rivers 

 like some species of TuchyGliieta, but lays spotted eggs. The Mosque-Swallows, have 

 rufous rumiDS, build bottle-shaped nests, often without any linini;', and lay pure whitr 

 eggs. If Bihlis is to be separated from Cotlle, then Illruinlu will also Ijc broken up 

 into genera ; but this separation can hardly be attempted before the method of 

 nidiflcation in the case of every species is known ; and this knowledge is, at present , 

 wanting. 



Genus 7. CHEEAMCECA. 

 Nest. Of gi-ass or leaves, in the hole of a bank or burrow. 

 Eggs. Pure white. 



Genus S. PEOGXE. 



Nest. Of grass, kc, lined with feathers, in the hole of a tree or wall, dill' or Iiuimmw 



Eggs. Pure a\ bite. 



Genus 9. ATTICOEA. 



Nest. Of grass, in the hole of a bank or under eaves. 



Eggs. Pure wliite. 



