NORTH AMERICAN TETRASTICHUS BURKS 



521 



Figure 18. — Thorax, Dorsal Aspect, of Tetrastichus 



a, Generalized Tetrastichus thorax. (JSB, anterior scutellar bristle; Ax, axilla; Mps, meso- 



praescutum; Msc, scapula; Mscl, mesoscutellum; MsS, thoracic spiracle; Pn pronotum; 

 PrB, praescutal bristles: PSB, posterior scutellar bristle; ScB, scapular bristles.) 



b, T. asparagi Crawford. 



c, T. fumipennis (Girault). 



d, T. tvhitmani (Girault). 



e, T. flora (Girault). 



530798 — 43 2 



