124 



Hind Wing Base Description 



First Basal Plate (Fig.203) 



Humeral Plate strongly lengthened distally as an extremely slender, sinuate sclerite. 

 Anterior margin sinuate; strongly sclerotized; adjacent to, and almost fused with BScA. 

 Antero-distal surface membranous. Apex broadly deltoid; curved ventrad. Dorsal margin 

 sinuate. Proximal margin deeply concave; strongly curved ventro-proximad. Ventral 

 margin sinuate. Suture line between FPC+BPC and FC+BC absent. 



Anterior Subcostal Basivenale oriented distad; rectangular; small; convex. Proximal and 

 distal sections separated by a prominent suture. Proximal section strongly and extremely 

 broadly extended anteriorly and postero-proximally as a broad convexity; much larger than 

 the distal section. Distal section extremely narrow; discontinuous with the Sc A bulge; 

 separated by a moderately deep concavity. Apex broadly rounded; oriented distad. - 

 Subcosta Anterior extremely broad; both concave and convex; extended posteriorly. Bulge 

 moderately broad; fused to BR. 



Radial Basivenale very strongly convex; open; discontinuous with radial stem; angled 

 proximad; rectangular to ovoid. Proximal arch slenderly deltoid; curved postero-distad. 

 Anterior section strikingly reduced by a greatly enlarged br; discontinuous with the anterior 

 margin of BR. Posterior margin weakly concave; surrounds the BMA arch apex. Postero- 

 distal margin truncate. Anterior margin fused to the posterior margin of ScA; extremely 

 narrow; strongly convex; angled antero-proximad. Embay ment normal size. Distal arch 

 discontinuous with radial stem; moderately broad; convex; broadly curved proximad; 

 oriented postero-proximad. br strongly sclerotized; occupies about one-third of the 

 proximal arch; discontinuous with BR. br projection slender; short; weakly distinct from 

 BScA. 



Second Basal Plate (Fig.204) 



MA-BMA Junction absent. - MP-BMP Junction: MP broadly continuous with BMP; arises 

 from below the BMP-BCuA brace. - Crimp Patterns absent. - BMP-CuA Brace absent. 

 - BMP-BCuA Brace present but modified; discontinuous with BMP; entire and greatly 

 strengthened; extends posteriad; posteriorly enlarged; convex; distinct from BMP. 

 Terminus fused to a deep concavity on the disto-medial section of BCuA. Point of fusion 

 discontinuous. 



Medial Basivenalia reduced proximally. BMA broadly scaphoid; completely fused to BMP. 

 Proximal surface convex. Medial and distal surfaces weakly convex. Anterior margin 

 weakly concave. Proximal arch extremely short; planate and straight; oriented antero- 

 proximad; strongly curved ventrad. Apex terminates below BR proximal arch apex. Distal 

 arch indistinct; fused to the proximal section of BMP. BMP junction with BMA 

 discontinuous and very broad; fused to brace; markedly convex; separated from both IBP 

 and BCu by membrane. Proximal section broadly deltoid; planate; slopes ventro-distad. 

 Distal section indistinguishable from BMP-BCuA brace; long; broad; rectangular; strongly 

 convex. 



