YESV1DJE. 



Solitary Watp-t. (Odynorinac.) 



Mandibles often long and sharp, or 

 having lateral teeth. Labial palpi 

 with three or four articles. Maxil- 

 lary palpi with three, four, five or 

 six articles. 



Eyes always extending to the base 

 of the mandibles. 



Thorax always wide and truncate 

 before. 



The second abdominal segment al- 

 ways the largest, widening like a 

 hell, and like a socket to those 

 following. 



Cljjpeus variable, emarginate, biden- 

 tate, truncate or rounded on its 

 inferior border; never terminated 

 by a tooth. 



Second cubital cell always narrowed 

 toward the radial. 



The second recurrent nervure some- 

 times received by the third cubital 

 cell. 



Social Wasp*. (Veapinae ) 



Mandibles al ways short and obliquely 



truncate, with the teeth rather ter- 

 minal. Labial palpi always with 

 four articles. Maxillary palpi with 

 five or six articles. 



Sometimes an open space between the 

 base of the mandibles and the eyes. 



Thorax sometimes strongly contract- 

 ed before. 



The second segment sometimes fun- 

 nel-shrped. The third segment 

 in that case the largest and a sort 

 of socket for those following. 



Clypeus often cordiform, terminated 

 by an angle or sort of tooth or by 

 a rounded lobe. 



Second cubital cell sometimes 

 square. 



The second cubital cell always re- 

 ceiving the two recurrent nervures. 



Tribe MASARINjE. 



(Parasitic Wasps.) 



Among these insects one notices in the antennae a tendency to 

 consolidation of the articles and to a rudimentary condition of the 

 maxillary palpi, as in general among parasitic insects. The 

 abdominal segments among some species are constricted at the 

 base so that one cannot receive another within it. 



The wings often fold with difficulty; they offer but three cubital 

 cells, and the two recurrent nervures always terminate upon the 

 second. 



The lip is at times quadrifid, and sometimes bifid. When bifid 

 it is also extensile by virtue of a peculiar mechanism. 1 



We know as yet but two representative genera of this tribe in 

 America — one of which forms a genus limited to this continent. 



1 See: Sanssure, Etudes sur la Faraille dea Vespides, 111. 23, etc. ; and 

 Aunales des Sciences Naturelles. 1857, VII. 



