HANCOCK 



27 



EXTERNAL ANATOMY. 



Figure 6. 



To properly study the various modifications of the external 

 organs, the profile is necessary in conjunction with observa- 

 tions made from above and those made from the front view. 

 Other less used positions may be called into use. Beginning 

 with the head, which lies in a vertical plane in relation to the 

 body, it is usually strongly encircled by the antero-dorsal and 

 antero-lateral margin of the pronotum above, while below the 



Po3TBfl,0« oft- ANTERlOt^ C*.»V'W»^ 



hrtCDIAM CARlNft 



Fig. 6. Lateral aspect of the body of Tettix. The face is shown to the 

 right, the pronotum and head below. Parts of the anatomy 

 are designated by self-explanatory nomenclature. 



mouth parts are surrounded by the sternomentum. The 

 superior surface of the head is bounded anteriorly by 

 the fastigium, which is usually carinated transversely 

 (not visible in Clioripliylhuii). The vertex lies behind 

 the fastigium and between the eyes and is much used 

 in classification. The crown is all the dorsal aspect of the 

 head from the fastigium in front to and including the occiput 

 behind. The occiput or posterior portion of the crown is 

 sometimes mammillate or sometimes concealed {Paratctlix 

 and Clypeotettix). The contour of the face may be more or less 



