396 
TRANSFORMATIONS OF I A SECTS. 
construct a cell, in which metamorphosis takes place into the 
nymph. 
The Tabamd<z y or Breeze Flies, are generally larger and more 
the metamorphoses of Tcibanus bovinus. 
powerful than the rest of the Diptera ; they have a large body, 
with a depressed head, and their sucker or proboscis is very 
different to that of the kinds just mentioned. They have a large 
trunk, which is sometimes longer than the whole body, and their 
