XXX ANALYTICAL TABLE. 



I. First segment of the abdomen bell-shaped, pyri- 



form, uniformly a little comb-shaped. Appear- 

 ance of Montezumia ..... 218 



II. First segment of the abdomen offering an ante- 



rior and a superior face separated by a sort of 

 transverse ridge or swelling (the true Hypo- 

 dynerus) ....... 219 



A. Form lengthened; first abdominal segment 



small, nodi form or pedunculiform, very much 

 narrower than the 2d ; its anterior face in a 

 lengthened triangle ..... 219 



B. Form shorter, wider ; first segment wide on its 



posterior border ; its anterior face in the 

 form of an equilateral triangle and a little 

 pedicellate; its superior face large . . 222 



a. Wings rufous along the anterior band . . 222 



b. Wings fuscous, with violet iridescence . 224 



C. Form very wide, short and depressed, first seg- 



ment very wide ; its anterior face sessile, in 

 the form of a wide triangle ; its superior face 

 very short, 3-4 times as wide as long . 225 



D. Form also quite chubby, but not so much 



depressed ; rnetathorax rounded, fiat or con- 

 vex behind, smooth, without marginal edges ; 

 first segment of the abdomen very short ; its 

 superior face transverse-linear. (Appearance 

 of a Vespa.) . .... 227 



Division Pachodynerus . . .... 228 



Table to assist in distinguishing the species of the 



Division Pachodynerus 229 



1st Section. — Thorax cubical (at least among the 

 males) or square, lengthened. Abdomen coni- 

 cal ; the first segment very large, as wide as 

 the second 230 



A. All the segments except the first bordered with 



yellow 231 



a. Metathorax forming a lateral angle on each 



side 231 



b. Metathorax rounded, not forming on each side 



a dentiform angle .... 236 



B. All the abdominal segments margined with yel- 



low or rufous 237 



a. Superior edges of metathorax not sharp . 237 

 o. Superior edges of metathorax sharp . . 238 



