COLEOPTERA— CHARACTERS, HABITS, CLASSH^^ICATION 57 



gilt --- 



various hard chitinous parts of the insect. Behind the head comes the 

 prothorax, which is capable of a certain amount of movement of itself. 

 It varies in shape — round, angular, square, trapezoidal, etc. The other 

 parts of the 

 thorax, the meso- 

 and metathorax, 

 are hidden be- 

 neath the ely- 

 tra and are 

 not visible from 

 above. The 

 mesothorax i s 

 small, the meta- 

 thorax being very 

 large in the 

 winged forms of 

 Coleoptera. In 

 the figure the dif- 

 ferent parts of the 

 thorax and the 

 other simpler por- 

 tions of the ex- 

 ternal surface are 

 named. For full 

 details on the sub- 

 ject the reader 

 should consult a 

 text-book on en- . 

 tomology. The 

 elytra when 

 closed cover 

 nearly all the 

 mesothorax and 

 the whole of 

 the metathorax, 

 lower wings, and 

 abdomen. The 

 upper portion of 

 the mesothorax 

 may be visible in 

 the shape of a 

 triangular or 

 square, etc., 

 shaped piece 

 known as the 



Fig. 29. — Longicorn beetle {Batoccra). \'entral view, legs removed 

 on one side, c, eye ; cx^ ^ ^ coxae of front, middle, and hind leg ; 

 ^;-i 2 3 trochanter of ditto ; fem^ - ^ femora of ditto ; tib^ - * 

 tibiae of ditto ; iar^ ^ ^ tarsi of ditto ; st^ '^ ■' prosternum, meso- 

 sternum, metasternum ; trn'^, trochanter of middle leg ; epm^ '^ " 

 epimera of prothorax, mesothorax, and metathorax ; eps'-, epister- 

 num of mesothorax ; eps^, episternum of metathorax. Front of 

 head : — e, eye ; /r, front ; fr.s, frontal suture ; aci, ante clypeus ; 

 cl, clypeus ; //', labrum or upper lip ; md, mandible. Under- 

 surface of head enlarged : — gul, gula ; gen, gena ; ni, mentum ; 

 sm, sub-mentum ; w^, mandible ; /, labium ; mx, maxillae. 



