358 Annals Entomological Society of America [Vol. XI, 



attached (and which serve to arch the tergal region in the 

 movements of flight). The prealar region "pas" of the meta- 

 notum is essentially like that of the mesonotum "pa2," but the 

 suralar process "surg" of the metathorax is slightly difl:erent 

 from that of the mesothorax "sur2." 



The Wing-Ossicles. 



The tegula "tgs" (Fig. 3) is present in the metathorax as 

 well as in the mesothorax of the grasshopper, unlike many 

 other forms in which it is retained in the mesothorax alone. 

 The median ossicle "ms" of the metanotum is not very different 

 from its homolog in the mesonotum; but the notopterale "nps" 

 has lost its slender neck-like prolongation present in the homol- 

 ogous plate "np2" of the mesonotum; although the small plate 

 just in front of the projection "sura" of the metanotum, doubt- 

 less represents the remains of this anterior neck-like prolonga- 

 tion of the notopterale. The basanal region "bs" at the base of 

 the anal veins is much larger in the metathorax than in the 

 mesothorax, but the plate "a" of the metanotum is smaller 

 than its homolog in the mesonotum. 



The Metapleuron. 



The ossicles "bas," "ias" and "sa" (Fig. 1) of the meta- 

 thoracic region are essentially like those of the mesothorax. 

 The postscutellum "psls" extends downward behind the wing, 

 making a postalar bridge connecting the tergal region with the 

 epimerum "ems," whose shape is somewhat different from that 

 of the mesothoracic epimerum "emo." The metathoracic 

 episternum "ess" is demarked from the region "Iss" by a faint 

 line which is absent in the mesothorax, while on the other hand, 

 the faint line demarking the region "ae" which is present in the 

 mesothoracic episternum is lacking in the metathoracic epister- 

 nal region. The region "Iss" is largely composed of the latero- 

 sternite, or lateral wing of the sternal region. Behind it, a narrow 

 antecoxal region "acs" is marked off in front of the metathoracic 

 coxa "cxs," and appears to be homologous with a portion of the 

 pericoxal ring "pc2" extending around the mesothoracic coxa. 

 The metathoracic trochantin is reduced to the small plate "tn" 

 at the base of the coxa. The metathoracic spiracle "s" is actu- 

 ally situated in the intersegmental region, but appears to be 

 located in the posterior portion of the mesothoracic pleuron. 



