DIPTERA 121 



LA BORA TOR Y PROGRA M 



A. The Study of the Living Specimens. 



1. Compare the flight of a house-fly and a cranefly as to 

 speed, directness and courses. 



2. Study the action of the proboscis of a fly in feeding on 

 sugar. To do this put a hungry fly and a lump of sugar 

 under a glass tumbler and sit by watching. 



3. Study the creeping locomotion of a maggot and of a 

 big cranefly larva. 



4. Study the swimming of a mosquito larva and of a 

 midge larva. Note rate, direction of movement, and how 

 effected. 



5. The same, for the pupae. 



B. The Study of Preserved Material. 



I. With a Muscina fly or a banana fly, or a house-fly in 

 hand, note. 



1. The compact body, and consolidation of all thoracic 

 segments. 



2. The large, wing-bearing mesothorax. 



3. The freely movable head. 

 On the head note : 



1. The huge eyes, overspreading the sides and top. 



2. The minute ocelli. 



3. The short, thick 3-jointed antennae, with a long bristle 

 arising from near the base of the third joint. 



4. The hinged, retractile sucking proboscis, bearing a pair 

 of palpi on its base, and a pair of opposable flaps 

 (labellae, singular labella) at its tip. 



