GENERAL OBSERVATIONS. 3 



general character to be noticed here. The six legs are at- 

 tached to the under surface of the thorax, a single pair to 



FIG. II. 



FIG. I. 



FIG. I. Body of an insect (Hymenoptera), showing the principal divisions : 

 A, head ; B, thorax ; C, abdomen ; a, antenna ; r, compound eyes ; tn, 

 mandible ; s, simple eyes ; b, prothorax ; d, mesothorax ; fc, metathorax ; 

 iW, fore- wing ; 2W, hind- wing ; n, coxa ; o, trochanter ; /, femur ; r, 

 tibia ; t, tarsus ; I to 9 segments of the abdomen. 



FIG. II. Oral and digestive system of Deinacrida megacepJiala (this insect is 

 drawn on Plate XVIII., fig. 2) : I, mandibles ; 2, maxillae ; 3, labrum ; 4, 

 labium ; 5, maxillary palpi ; 6, labial palpi; 8, oesophagus; 9, crop ; 10, 

 gizzard; II, pancreas; 12, stomach; 13, biliary vessels; 14, ilium; 15, 

 colon ; 1 6, anus. 



each division ; they are composed of the following joints : 

 coxa (Fig. I. n), trochanter (o), femur (p), tibia (r), and 

 tarsus (s). 



