108 



Lessons in Zoology. 



whole of the antennee. They aie really, however, attached to one 

 side of the true feelera. The toDgne, conaiatiiig of the modified 

 second maxillse, is the only conspionoaa month-part. There are 

 neither mandibles nor first maxillse in this form, bnt with a good 

 magnifying glass one can see the large palpi of the first maxillee 

 and the long, horny npper lip closely pressed over the npper side 

 of the tongne. The two broad lobes that form the end of the 

 tongne are ronghened by cross-bars (Fig. 4). 



Fig, 4. 



mx 



The house-fly simply laps his food, and has no need of 

 pincers, but the horse-fly has sharp, lance-like mandibles 

 (Fig 4, md) and first maxills (ma;'), adapted for piercing 

 the skin of horses and cattle, in addition to the long la- 

 brum, or upper lip (Ja), the broad tongue (mx"), and the 

 palpi of the first maxillae (a/). The antennsB (at) are 

 also shown. In the curious large robber-fl[e!<, or insect- 

 hawks (Fig. 5), which attack bees, beetles, and other in- 

 sects, the month-parts form a powerful black sting. 



The eggs of the house-fly are laid in stables, where the 

 larva lives for several days as a white maggot without 

 feet, then in a week of quiet the pupa changes to the 

 perfect insect, which buzzes about our houses for a few 

 weeks more. 



