PARASITICA — ICHNEUMONIDiE. 49 



17. — Teeth of the niaiulibles unequal, the lower longest; clypeus trnurate at the 



anterior niargiu '-Acrotoinui« Holmgr. 



Teeth of the mandibles nearly alike; clypeus broadly rounded anteriorly. 

 Abdoiuen sessile or subsessile ; tarsal claws almo.st always iicctinate. 



CteiiiNCtis Hal. 



Abdomen subpetiolate ; tarsal (-laws simple Exystoii Schiodte. 



18. — Eyes siibeinarginate; scape of antennte thickened, ovate or ohlong-ovate ; 

 metathorax with oval spiracles; areolet wanting, rarely present; second 



recurrent nervure generally more or less bent 19. 



Eyes entire ; scape of antennee long, cylindrical ; metathorax with circular 

 spiracles ; areolet pentangular, triangular or wanting : second recui-rent 



nervure straight Ortlioceiitrus Grav. 



19.— Abdomen petiolate, spiracles of first segment placed behind the middle; 

 areolet present. 



Posterior tibia; with but one apical spur '-'-IVIoiiopIoctron Holmgr. 



Posterior tibije with two apical .spurs '''Isoliyroeiieinis Holmgr. 



Abdomen sessile or subsessile, rarely subpetiolate, spiracles of first segment 

 placed before the middle, rarely in the middle; areolet rarely 

 present. 



Metathorax not areolated above Exo€lioi(les Cress. 



Metathorax areolated above. 



First joint of flagellum usually more than twice longer than wide. 

 Second and following abdominal segments above smooth and polished, 



never carinate Exocliuisi Grav. 



Second and sometimes the third abdominal segments above longitu- 



diually carinate ChoriiiH'iis^ Holmgr. 



First joint of flagellum very short, usually broader than long. 



'Hyperacnms Holmgr. 



Subfamily Pimplin.t:. 

 Table of Genera. 



Head transverse, cheeks usually not much swollen ; abdomen sessile or subsessile. 2. 

 Head more or less cubical, spherical or subquadrate, more or less extended behind 

 the eyes, the mandibles generally protruding and forming, with the 

 depressed clypeus, a sort of mouth-opening ; abdomen subsessile or sub- 

 petiolate, rarely petiolate 17. 



2. — Abdomen subcompressed (but never so that its dorsum becomes carinate), and 

 always depressed at base ; the ovipositor arising from the apex of the 



abdomen, the last ventral segment long, lanceolate 3. 



Abdomen distinctly depre.ssed, sometimes subcompressed towards apex in 9 .4. 

 3. — Areolet triangular, petiolate, receiving the second recurrent nervure at or 

 near its tip; legs and antennse slender; clyj)eus separated. 



C'oIeo<'C'iitrii»i Grav. 

 Areolet wanting. 



Posterior tibise and tarsi long and slender, the tibia' ahnost twice the 



length of the femora which are somewhat tliickened ; anteniue slender, 



much longer than the head and thorax; first submarginal cell either 



receiving both recurrent nervures, or the second recurrent uniting with 



the transverse cubital nervure Arolt'S (irav. 



TKANS. AMER. ENT. SOC. (7) SITPPL. VOL. 18a7. 



