92 INSECTA 



(b) The maxillae, the two blades above the tongue. 



(c) The slender labial palpi below the tongue. 



6. The Wings. 



(1) Are the posterior and anterior pairs equal in size? 



(2) How are the wings arranged when at rest? When in 



motion? 



(3) What peculiarities about them? 



(4) Are the wings thick and opaque or membranous and 



transparent? 



7. The Legs. 



(1) Are the legs alike? 



(2) Compare the posterior legs, segment for segment, with 



those of the grasshopper. 



(3) What special adaptation do you find in the tibise? 



(4) How do the basal joints of the tarsi differ from those of 



the other legs? 



(5) For what are the cutting edges between the two large 



segments adapted? 



8. The Abdomen. 



(1) Shape? 



(2) Segments? 



(a) Number? 



(b) What is the peculiarity of the anterior segment? 



(c) Of the second anterior segment? 



(d) Can the abdomen be bent under the thorax? If so, 



purpose? 



(3) The Sting. If your specimen is a female, examine and 



describe the sting. 

 Why has the male no sting? 



THE HOUSE FLY 



Morphophysiologic Study 



In this study a good magnifying glass or dissecting microscope 

 will be needed. 



1. How are the head and thorax united? The thorax and the 

 abdomen? 



2. With what is the body covered? 



