ODYNERUS. 251 



,. , T , . 85. f proctus. 



6. Very large species. -^ ' 



80. v consors. 



6, 6. Species of medium or small size. 



7. Metathorax forming on each side a lateral angle. 



8. Superior angles of metathoiax separated from post- 



scutel by a fissure or a notch. 

 Superior angles produced into erect spines ; scutel 

 yellow. 87. Scutellaria. 



9, 9. Superior angles not spined. 



10. Lateral angles acute; margin of 2d segment 

 reflexed; scutel black. 82. Hidalgi. 



10, 10. Lateral angles obsolete; margin of 2d segment 

 not reflexed ; scutel maculate. 

 11. Metathorax very sharp ; 1st segment broadly 

 margined with yellow. 100. turpis. 

 11, 11. Metathorax not sharp; 1st segment not mar- 

 gined in the middle. 88. Cordovje. 



8, 8. Superior angles of metathorax not produced. 



9. Scutel yellow or maculate; clypeus J yellow; wings 

 ferruginous. 

 10. Second segment margined with yellow. 

 11. Smaller; more slender ; scutel yellow. 



98. spectabilis. 

 11, 11. Larger, less slender, scutel maculate. 



91. J ajticafis. 

 97. {formosus. 

 10, 10. Second segment mostly yellow. 



96. sulfureus. 

 9, 9. Scutel black ; clypeus 9 rufous or black and yellow. 

 10. Ornaments of the body bright yellow. 

 11. Wings smoky. 92. arrensis. 



11,11. Wings smoky-ferrnginous. 94. annulatus. 

 10,10. Ornaments dull yellow; wings ferruginous; 

 body rather pubescent. 91. Alvaradi. 



7, 7. Posterior face of metathorax more or less orbicular, not 



forming two lateral angles. 

 8. Superior edges of metathorax sharp, produced, separa- 

 ted from post-scutel by a distinct fissure or a notch. 

 9. Segments 1, 2 margined with luteous. 



101. Afegmra. 

 9,9. Segments 2, 5 margined with yellow or luteous. 

 10. Second segment without yellow maculffi. 

 11. First segment only maculate on the si les. 



88. Cordova. 

 11,11. First segment margined with yellow. 

 12. Scutel maculate with yellow. 

 13. Edges of the concavity of metathorax very 

 sharp. 100. turpi*. 



