1968] 
Matthews and Matthews — Trypargilum 
293 
Sandhouse, G. A. 
1940. A review of the Nearctic wasps of the genus Trypoxylon. Amer. 
Midi. Natur., 24: 133-176. 
Smith, H. S. 
1908. The Sphegoidea of Nebraska. Univ. Nebraska Stud., 8: 1-88. 
