G. C. DAVIS. 195 



whetlier elevated, separated from the face or iK/t, and the ditierent 

 forms which it assumes, especially at the apex. Another is the 

 humeral cross nervure of the hind wing, whether broken or not, and 

 if so, whether broken above or below the middle (see cut of the same 

 which is broken above the middle at a, Fig. 1). A third, and very 

 important character, is the areolets and cariuje forming them. A 

 completely areolated metathorax is represented in the accompanying 

 figure, Fig. 2. 



Synopsis of the Tribes of Iciineumonidae. 



1. Abdomen more or less compressed, petiolate, rarely sessile or subsessile ; areolet 



usually triangular or wanting 2. 



Abdomen not compressed, or if so. as in some cases, it shows various other 

 characteristics 10. 



2. Basal segment of hind tarsi thickened ANOMALONINI. 



Basal segment of hind tarsi not thickened 3. 



3. Middle tibite with a single spur TRACHYDERMATINI. 



Middle tibite with two spurs 4. 



4. Median vein of hind wing disappears towards the base ; costal vein thickens 



as it approaches the front margin; the two sections of the radius form a 



right angle PORIZONINI. 



Median vein does not disappear toward the base and the main vein does not 

 thicken as it approaches the front margin ; segments of the radius not at 

 right angles 5. 



5. Posterior femora armed witli a strong median tooth beneath. 



PRISTOMERINI. 

 Posterior femora without tooth beneath 6. 



6. Stigma short and broad, wedge-shaped, scarcely twice as long as wide; wings 



without areolet; margin between vertex and occiput broken in the middle. 



CREMASTINI. 

 Stigma elongate 7. 



7. Third diseoidal cell narrowed at base, rarely ever half as wide as the second 



recurrent nervure ; ocelli large 8. 



Third diseoidal cell about half, or more than half as wide as at apex ; ocelli 

 small 9. 



8. Antennae clavate ; both frontal depressions very large and entirely separate. 



HELLWIGINI. 

 Anteunse not clavate ; frontal depressions not large, and not entirely sejiarate. 



OPHIONINI. 



9. Humeral cross-nervure of hind wing either straight or broken below the 



middle CAMPOPLEGINI. 



Humeral cross-nervure broken at or above the middle ; abdomen sul)sessile 



to sessile BANCHINI. 



10. Abdomen deeply and coarsely punctured, sometimes aciculately so ; scutelUun 

 large, usually margined ; posterior tibiae with two spurs ; form robust. 



METOPINl. 



Abdomen rarely coarsely and deeply punctured, and if so the posterior tibia? 



lack the two spurs 11. 



TEANS. AM. ENT. SOC. XXIV. JULY, 1897. 



