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PROCEEDINGS OF THE NATIONAL MUSEUM 



tions, without any distinct blotch; venation pale brown, only outer 

 gradates slightly and inner gradates strongly marked with bro\vn, the 

 latter forming the only conspicuous marking; apical and outer 

 margins very narrowly dark browTi w4th many pale interruptions. 

 Radial crossvein absent. 



Figure 2. — Sympherobius texanus, new species: a, terminal abdominal segments, lateral 

 viewj b, the same, dorsal view; c, anal plate, internal-lateral view; d, parameres, 

 lateral view; e, tenth sternite, dorsal view, with aedeagus bent posteriorly. 



Male genitalia: Anal plate wdth ventroposterior angle slightly 

 produced in lateral view; process single, fairly long, and straight. 

 Tenth sternite with ventroproximal part of lateral "wing" expanded 

 into a very large roundish flap. Parameres with the expanded distal 

 part rounded on margin, without projecting middle arm. 



This species will fit into a modification of couplet 9 (species without 

 radial crossvein) in Carpenter's key: 



9. Forewing membrane predominantly brown 9' 



Fore wing membrane predominantly hj^aline . to 10 of Carpenter's key 

 9'. Forewing narrowed toward apex and hindmargin rounded out; larger 



species: forewing 4.5 mm. long S. arizoniciis Banks 



Forewing broadly rounded toward apex and hindmargin straight; 



smaller species: forewing 3 mm. long ... S. texanus, new species 



Texanus belongs to Gurney's "perparms group," which is charac- 

 terized by the anal plate of the male bearing a single process and which 

 includes S.perparvus, S. beameri, and S. killingtoni. Of these the latter 



