222 



NORTH AMERICAN DIPTERA 



Dolichopidae III. — 29, Tachytrechus; 30. Hypocharasus ; 31. Thrypticus; 32, Neosyntormon ; 

 33, Peloropeodes brevis ; 34, Diostracus prasinus ; 35, Parasyntormon asellus; 36, Xanthina 

 subcurva; 37, Stolidosoma permutatum ; 38. Polymcdon dilaticosta; 39. Chrysotus discolor. 



