48 



these genera, that I need not further refer to them. The oesophageal bulb, as 

 sucking apparatus, behind the oesophageal nerve-ring, exists, as far as I know, 

 only in Culex, and cannot therefore be compared with any other like structure ; 

 and I will here end my notes on the comparative structure of the mouth- 

 parts and suctorial apparatus of the diptera, whose examination and dissection 

 furnished me the materials for this paper. 



