564- EXTERNAL ANATOMY OF INSECTS. 



same tribe, it is armed with one or more conical obtuse 

 teeth. 



7. Scapularia*. The scapulars are situated between the 

 coxa of the mid-legs and the base or axis of the upper 

 organs of flight, and they seem to act as a fulcrum to each. 

 In the Coleoptera Order they are most commonly qua- 

 drangular or subquadrangular, often divided diagonally, 

 and sometimes transversely, by an impressed line ; the 

 posterior partj which is usually the most elevated and 

 often has an uneven angular surface, is that which in- 

 tervenes between the coxae and elytra : where the former 

 are short, as in the Capricorn beetles, the scapulars are 

 long; and where they are long, as in the Petalocerous 

 ones, the latter are short. The anterior part is that 

 which forms the lateral limit of the peristethium, upon 

 which it often encroaches : this part, in conjunction with 

 the dorsolum above, and the last-named part below, 

 forms the kind of rotula that plays in the posterior aceta- 

 bulum of the manitrunk, as the head does in the anterior 

 one. In the flower-chafers (Cetonia F.) the scapulars 

 are very thick and elevated, and interpose between the 

 posterior angles of the prothorax and the shoulders of 

 the elytra, which is one of the distinguishing characters 

 of that tribe : in this case the lower angle of the scapular 

 connects with the coxa of the mid-leg, and the upper 

 angle with the axis of the elytra ; and the most elevated 

 and thickest part of the scapular is about midway between 

 the two. This robust structure seems to indicate that 

 the scapular has to counteract a powerful action both of 

 the leg and elytrum. In the Orthoptera the scapulars 



a Plates VIII. IX. o. 



