26 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I3I 



EXPLANATION OF FIGURES 



All muscles figured are numbered uniformly according to the list below. 

 Instances in which the definitive attachments differ from those given in the list 

 have been discussed fully in the text. 



The arrangement of ventral muscles in certain species is such that not all of 

 them can be shown in a single drawing. However, all cockroaches studied have 

 all muscles given in the list, whether the muscles appear in the figures or not, 

 except as noted under tables i and 2 or in the text. The termite Zootennopis 

 (fig. 6) and the mantid Tenodera (fig. 7) have only the ventral intersegmental 

 muscles shown in the drawings. 



In a few instances different levels of dissection have been shown in different 

 parts of the same figure; this does not imply an absence of the usual bilateral 

 symmetry. To assist in orientation, some figures contain a few muscles that do 

 not belong to the ventral intersegmental category. 



The scale indication represents i mm. 



NUMBERING OF MUSCLES IN FIGURES I-18 



Variants from these attachments are discussed in the text. 



