139 

 142 

 143 

 149 

 151 



SXViii ANALYTICAL TABLE. 



PAGE 



,i. On each side of metathorax a dentiform angle . 134 

 6. Metathorax without distinct spiuiform angles . 137 

 C. Abdomen slightly fusiform, enlarging as far as the 

 extremity of the 2d segment ; the 1st segment a 

 little funnel-shaped, divided by a feeble longitu- 

 dinal groove. Thorax lengthened 

 i. Nortonia Sauss. ...•••< 



Gen. Rhynchium Latr. ...... 



i. Odynerus Latr. ....... 



Definition of the subgenera ..... 



Subgenus Symmorphus Wesm. ..... 



o. Segments 1-4 of the abdomeu bordered with yellow 152 

 ts 1,3, 4 of the abdomen bordered with yellow 153 

 c. Segments I, 2 only, of the abdomen bordered with 



yellow l- r >5 



Subgenus Ancistrocerus Wesm. ...... 157 



Division Ancistrocerus (properly speaking) . . . 157 

 Table to assist in the determination of the species of 



Ancistrocerus ....... 158 



I. .Metathorax having its concavity angulate, bordered 



all around by trenchant ridges . . . 159 



A. Form lengthened, slender .... L60 



13. Form still lengthened, but less slender . . 163 

 i . Body more gathered, normal, but the thorax 



Still sensibly longer than wide . . . lb'7 



a. Metathorax destitute of strong spines . . 167 



6. Metathorax bavin,' two strong spines . . 173 



D. Form very stubbed. Thorax cubical, nearly 



as long as wide ...... 175 



II. The concavity of the metathorax forms no distinct 



lateral angles ...... 177 



A. Posterior tare of metathorax remaining mar- 



gined, but without distinct angles. Body 

 slender, elongate . . . . .177 



a. Post-scutel strongly truncate . . . 177 

 6. Post-scutel not truncate, angulate posteriorly 179 



B. Metathorax not distinctly marginate. Body 



not slender, of normal form . . . 180 



<(. Abdomen nearly conical. The border of the 



2d segment not reftexed. Body velntinous 180 



b. Abdomen more ovalo-oonical ; the border of 



2d segment rugose or refiexed . . . 1S1 



