120 



U.S. NATIONAL MUSEUM BULLETIN 261 



Thorax with pronotal width equal to or exceeding transocular width 

 of head, lateral margins undulate, with a transverse anterior sub- 

 marginal fovea behind which disc is gradually elevated posteriorly 

 and with a median more anterior, and two more posterior tuberosities, 

 disc coarsely punctate to pitted, posterior margin concave, with a 

 dorsopleural keel which varies from oblique and rectilinear to strongly 

 arched; scutellum transversely striate (striae often indistinct) in 

 posterior half. Forewing with a very narrow membrane including 

 inner apical cell and apical portions of other apical cells, remainder 

 of wing usually heavily coriaceous and with venation obscure ; second, 

 third, and fourth apical cells of approximately equal length; without 



Figure 113. — Peltocheirus bigibbosm (Signoret), specimen from Surinam. 



an anteapical plexus of veins but with supernumerary veins to costal 

 margin in apical third of wing; apical margin shallowly concave; 

 wings of female in rest position concealing ovipositor. Hindwing at 

 rest extending almost as far posteriorly as apex of forewing; vein 

 R2+3 entire. Anterior legs with tibiae conspicuously flattened and 

 expanded. Hindlegs with femoral setal formula 2:0:0; first tarsomere 

 with length less than combined length of second and third. 



Male genitalia: Pygofer strongly produced and diagonally truncate 

 apically, with numerous submarginal microsetae near apical and 

 posteroventral margins, without processes. Plates separate throughout 

 length, extending farther posteriorly than pygofer apex, each triangular, 

 with numerous uniformly dispersed microsetae. Style extending farther 



