238 Annals Entomological Society of America [Vol. XI, 



plates. The episternum (es) is long and somewhat narrow. Its 

 lower portion lies virtually below the coxa (ex) and hence has 

 been called the subcoxal plate by some authors. It is evident, 

 however, that it is really but a part of the episternum. Fused 

 to the anterior (or to what is normally the dorsal) end of the 

 episternum, the homologue of at least one of the two basalar 

 plates (aba) occurs. The posterior basalare may also be present. 

 The epimeron (em) is triangular in shape and lies above the 

 episternum. It is produced posteriorly to a sharp point, which 

 overlaps the metapleuron and bears dorsally a knob-like pro- 

 jection. This projection fits into a socket in the closed fore wing 

 to hold it fast. 



Sternum. Owing to the aforementioned shifting of the 

 pleural plates, the sternum lies along what would naturally be 

 the anterior margin (but actually is the lower margin) of the 

 episternum. The coxa (ex), as has been stated, proceeds from 

 the rear of the segment, the attachment being concealed beneath 

 the pleuron at a point marked (x). The trochantin is hidden 

 beneath the episternum. 



Metathorax. Figure 20. 



Notum. The notum is not long mesally, but it lengthens as 

 it reaches the wing. It is largely composed of the prescutum 

 (psc) and the scutellum (si), the other plates not being clearly 

 defined, though the scutum (sc) is probably represented. The 

 postscutellum (psl) is concealed and is fused with the narrow 

 first abdominal tergite. The postalare (poa) is unusually broad 

 where it joins the epimeron. 



Pleuron. The pleuron of the metathorax overlaps the coxa 

 to some degree. Like the mesopleuron, it is turned or twisted 

 so that the pleural suture (p) is nearly horizontal. The epister- 

 num (es) is divided into an upper (aes) and a lower section 

 (kes), but these may not be homologous with similar divisions 

 in the mesopleuron of Cicada and related forms. The lower 

 portion (kes), often designated as the subcoxal plate, is pro- 

 duced backward in a pointed flap, which reaches two-thirds the 

 length of the coxa. The epimeron (em) is small, triangular and 

 pointed posteriorly. 



Sternum. The metasternum (st) is not clearly separated 

 from the episternum. It is very similar to the sternum of the 

 mesothorax. The hind coxa (ex) is very large. '. . i [ > 



