288 



ARTICULATA : IXSECTA. 



head is furnished with mouth, eyes and antennae to the 

 thorax are appended the legs and wings and the abdo- 



FIG. 356. 



Head. 



r Thorax. 



Abdomen. 



An Insect Proper. 



Leg of an Insect Proper. 

 A, coxa ; B> trochanter ; 

 C> femur ; D> tibia ; 

 P, tibial spurs ; E, tarsus 

 composed of five tarsal 

 joints, the last one end- 



ing in a claw. 



men contains the principal organs of digestion and other 

 viscera, and to it also belong the piercer and sting with 



ns nt nl nl ac ns MS u r 



Anatomy of an Insect Sphinx ligustri. 



st, spiral tongue or modified maxillae ; lp, labial palpi ; ac, alimentary canal, form- 

 ing a straight tube in the head and thorax, but a crop and chyle-forming stomach in 

 the abdomen ; ns, main portion of the nervous system, exhibiting the largest nervous 

 mass in the head ; nw, nervous threads going to the wings ; dv, dorsal vessel or 

 heart ; nl, nervous threads going to the legs ; u, urinary vessels ; and r, reproduc- 

 tive organs; 8-10, segments of the thorax; 11-20, segments of the abdomen.* 



which many kinds of insects are provided. Insects 

 proper have only six leg's and hence are often called 



* According to the latest views, there are four segments in the head of 

 Hexapods ; two in the head of Arachnids ; and four in the head of Myria- 

 pods. Packard. 



