EXTERNAL ANATOMY OF INSECTS. 411 



organs that are transmitted from the head through the 

 latter part to the rest of the body. Though the head in 

 most Orthoptera is not partly received into the cavity 

 of the prothorax, as is the case in the Order Coleoptera, 

 but is rather suspended to it, yet in some instances, for 

 example in the mole-cricket [Gryllotalpa vulgaris), it is 

 partially inserted. 



Again : when, in his Jirst mode of articulation by con- 

 tact of solid parts, he speaks of one or two smooth tu- 

 bercles of the neck, with their corresponding cavities in 

 the prothorax, as forming the most common conforma- 

 tion, you would expect to find examples of this in very 

 many insects ; yet upon a close examination, unless in 

 Oryctes nasicomis a , and perhaps in others of the Dy- 

 nastidce MacLeay, you would scarcely meet with any 

 thing that could be called a tubercle and its correspond- 

 ing cavity in the neck or prothorax of any Lamellicorn 

 or Capricorn beetle that you might chance to examine. 

 You would find, indeed, that the occiput was usually 

 smooth and very slippery, as if lubricated ; that in its 

 margin were one or two notches (Myoglyphides), with 

 muscles attached to them ; that in the former of these 

 tribes, the Lamellicorns, it projected on each side so as to 

 form a more or less prominent angle ; and that the throat 

 (jugulum) was very convex, and lodged in a cavity of the 

 lower margin of the prothorax : but further appearances 

 of tubercles &c. you would in vain look for even in this 



a It is probable that M. Cuvier took his idea of this first kind of 

 articulation, by contact of solid parts, from this individual insect; 

 since, besides its very prominent throat, there is on each side of the 

 lower part of the occiput a small elevation, or approach to a tu- 

 bercle. 



