PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



issued 



SMITHSONIAN INSTITUTION 



U. S. NATIONAL MUSEUM 



1 



Vol. 84 Washington: 1936 No. 3004 



A NEW NORTH AMERICAN MASON-WASP FROM VIR- 

 GINIA, WITH NOTES ON SOME ALLIED FORMS 



By Joseph Bequaert 

 Museum of Comparative Zoology, Harvard University, Carnbridge, Mass. 



A MASON-WASP, recently discovered in Virginia, belongs to an ap- 

 parently imdescribed form of Odynerus tempiferus Viereck, a species 

 related to 0. pratensis H. de Saussure. Both these species differ 

 from the other North American Odynerus in having the entire first 

 and the greater part of the second tergite (except for a preapical 

 zone of coarse punctures) practically impunctate. The two species 

 may be separated as follows: 



Lateral angles of propodeiim prominent, broadly triangular, with 

 sharp apex. Clypeus {9 $) scarcely or not wider than high, 

 the apical margin slightly curved inward and with prominent, 

 sharp lateral teeth. Humeral margin of pronotum with a low 

 carina, which is narrowly interrupted in the middle ; dorsal 

 face of pronotum evenly rounded off into the lateral, vertical 

 areas. Thorax short and thickset tempiferus 



Lateral angles of propodeum broadly and evenly rounded off. 

 Clypeus (9 S) nearly one and one-third times as wide as high, 

 the apical margin straight, its lateral angles not toothlike. 

 Humeral margin of pronotum with a high carina, continuous 

 across the middle; dorsal face of pronotuiu separated from 

 the lateral, vertical areas by a ridge, particularly prominent 

 and often somewhat carinate at the humeral angles. Thorax 



elongate pratensis 



92742 — 36 79 



