No.i'io.;. ICHNEUMON FLIES— ASHMEAD. Ill 



TAHI.E OK SUBKAMIIJES. 



C'l.\iifns emarginate or impressed anteriorly, forming with the mandibles a semicir- 

 cular opening; articulation between segments 2 and 3 rigid, connate. . 12 

 Clyix-'us not emarginate or impressed anteriorly, the mandibles when dosed fitting 

 close to it and leaving no semicircular opening; very rarely with a slight 

 opening in some Opi'miP. 

 TIead with the cheeks rarely margined, the temples and tlie occiput always 



immargined 8 



Head with the cheeks, temples, and the occiput margmed. 



Abdomen not distinctly segmented, without sutures, or at most with 2 or 3 

 superficial sutures, the dorsum convex, the venter usually strongly con- 

 cave; spiracles of first segment rounded, placed verjMiear the base.. 7 

 Abdomen normal, with the usual sutures 2 



2. Abdomen sessile, the spiracles of first segment placed much before the middle. 5 

 Abdomen petiolate or petioliform, the spiracles placed at or a little behind the 



middle. 

 Subdiscoidal nervure in front wings f)riginating from the base of the discoi- 



dal nervure, or at least below its middle; all abdominal segments not 



flexible 3 



Subdiscoidal nervure usually interstitial or originating ciJiove the middle of 



the discoidal nervure; all abdominal segments flexible. 



Subfamily I. aphidiin^e. 



3. Front wings with three cubital cells 4 



Front wings with two cubital cells or less. 



Stigma very long and narrow, lanceolate; marginal cell acutely pointed at 

 apex, the submedian cell shorter th^n the median; hind coxpe very 

 long and slender; abdomen inserted high up on the metathorax. 



Subfamily II. paxvlommin^e. 

 Stigma large, broad, oblong, or subovate; marginal cell most frequently very 

 short, sometimes absent, the submedian cell as long or longer than the 

 median; hind coxfe normal; abdomen inserted normally. 



Subfamily III. euphorin^. 



4. Stigma large, broad, subtriangular; second cubital cell wider than long or sub- 



quadrate; mesonotal furrows, as a rule, shallow, not deeply or sharply 

 impressed, and converging and meeting in a depression before attaining 

 the base of the scutellum; tibial spurs distinct, but not especially long. 



Subfamily IV. meteorin.e. 



5. Front wings with tvjo cubital cells 6 



Front wings with three cubital cells; anal cell most frequently divided by a 



transverse nervure or a stump of a nervure. 



Head small, transverse, the temples narrow or flat; abdomen elongate and 

 slender, the sides parallel or nearly, or somewhat strongly compressed, 

 usually longer than the head and thorax united; tibial spurs not short, 

 long or very long Subfamily V. macrocentrin^. 



Head usually large, quadrate or subquadrate, the temples broad; al)domen 

 rarely much longer than the head and thorax united, most frecjuently 

 shorter, ovate or oval; tibial spurs short, stout. 



Subfamily VI. helconinj;. 



6. INIesonotum, except in Centistes Haliday, with sharply defined parapsidal furrows, 



the furrows usually punctate and converging and uniting at or befoFC 

 attaining the base of the scutellum; tibial spurs either well developed 

 or short; hind i-n\iv large, nmch larger than the anterior and middle 

 pairs Subfamily VII. blacin.^. 



