Doerixg: Lki'yronia quadrangularis. 553 



The cpimcron is likewise a large sclerite, but it is found chiefly 

 on the lat(M-al and dorsal parts of the segment. It occupies the 

 dorsal half ol' the pleuron and lateral part of the dorsum, where 

 mesad it touclu^s the lateral margins of the scutum and postscutel- 

 luni (J)!. lA'II. fig. l)f. The lateral extensions of the metascutellum, 

 which arc joined to the axillary coi'd of the wing, lie on top of the 

 epinu'i'on. From a lateral view (pi. LVII, fig. 8) the indentation 

 made hy I he wing process can easily be seen. Ventrally the epi- 

 meron shows as a })late forming the caudal boundary of the epister- 

 num. A <uture divides the sclerite into an upper and lower portion. 

 A fiaplike process is present in the lower epimeron of Lepyronia, 

 which is probably similar to that found by Taylor (1918) in an 

 Aphrophom. 



The stennnn. (pi. L^TI, fig. 11) is small when compared to the 

 sternum of the mesothorax. The presternum of this segment is 

 l)artly membranous, with a weak deposition of chitin in its median 

 and caudal portions. It is roughly crescentic in shape. 



The sternum is entirely membranous and is divided into two dis- 

 tinct halves by a very narrow, chitinous band, which appears to be 

 a caudal extension of the chitinous part of the presternum. 



The sternelhtm appears to be a narrow, chitinous rod extending 

 between the epimera, with which it appears to be fused. It is 

 located beneath the posterior coxse, and for this reason is more 

 easily seen from a dorsal view than from a ventral view (pi. LVI, 

 fig. 7). 



The trochanfin is a knoblike structure terminating the caudal 

 end of the pleuron. It is termed by Taylor (1918) the meron, or at 

 least he assigns this term to a similar structure in an Aphrophora, 

 but does not account for a trochantin. 



THE WINGS. 



The jorewing (pi. LVIII, fig. 4) of Lepyronia is thick, opaciue 

 and rather tough. Its entire surface is broken up into fine reticula- 

 tions and is covered by a grayish pubescence, similar to that of the 

 head. These conditions, together with the even coloring of the 

 wing, entirely obscure the venation in uncleared specimens. It was 

 only in half-bleached specimens that the veins could be traced at 

 all. The venation of both wings here studied was found to be 

 almost identical with the venation of the same species as described 

 by Metcalf fl9]7), 



Costa is a single, unbranched vein which forms the costal border. 



