TO. 1200. ICHNEUMON FLIES— ASHMEAD. 105 



3. Second abdominal segment tuith a distinct transverse impressed line, usually 



indicated by a difference in the sculpture, whereby the segment is sepa- 

 rated into two divisions 4 



Second abdominal segment vnlhout a transverse impressed line 5 



4. Recurrent nervure received by the first cubital cell; stigma large oval, the 



radius originating from beyond its middle; third and following abdomi- 

 nal segments distinctly separated (816) Trachyusa Ruthe. 



Recurrent nervure received by the second cubital cell; second discoidal cell 

 not completely closed at apex; third and following segments closely 

 united, indistinctly separated (817) Si/mphancs Forster. 



5. Recurrent nervure received by the second cubital cell 6 



Recurrent nervure interstitial or received by the first cubital cell 8 



6. Second discoidal cell completely closed 7 



Second discoidal cell open at apex; first Joint of the flagellum longer than the 



second (818) Peniapleura Forster. 



7. Radius originating from before the middle of the stigma. 



(819) Hypostroplia Forster. 



Radius originating from the middle of the stigma; first and second joints of 

 flagellum subequal; subdiscoidal nervure originating from or a little 

 above the middle of the discoidal nervure ( 820 ) Ejiidista Forster. 



Radius originating from beyond the middle of the stigma; subdiscoidal nervure 

 interstitial (821 ) Goniarcha Forster. 



8. Radius originating from beyond the middle of the stigma 9 



Radius originating ivombefore the middle of the stigma. (822) Tmiycarpa Forster. 



9. Discoidal nervure oblique or angulate, the subdiscoidal nervure not inter- 



stitial 10 



Discoidal nervure straight, the subdiscoidal nervure inierstitml or nearly; 

 spiracles of metathorax small, round (823) Cratospila Forster. 



10. Spiracles of metathorax very small, punctiform 11 



Spiracles of metathorax very large (824) Alys'ia Latreille. 



11. First joint of the flagellum somewhat longer than the second 12 



First joint of the flagellum distinctly shorter than the second. 



Scutellum conical, the postscutellum armed with a spine or tul^ercle; wings 

 maculate, the second cubital cell narrow. 



(825) Hoplitalysia Ashmead, new genus. 



(Type, Hoplitalysia slossonae Ashmead, manuscript. 



Scutellum at the most convex; wings not maculate, the second cubital cell 



normal (826) Idiasta Forster. 



1 2. Recurrent nervure interstitial ( 827 ) A narcha Forster. 



Recurrent nervure received by the first cubital cell (828) Strophxa Forster. 



13. First joint of the flagellum scarcely so long as the second or clearly shorter.. 16 

 First joint of the flagellum always somewhat hmgcr than the second. 



Second discoidal cell jsresent 14 



Second discoidal cell absent (829) Opisendra Forster. 



14. Stigma not unusually thickened 15 



Stigma very large and unusually thickened, the recurrent nervure received by 



the second cubital cell. 

 Abdomen with three segments, as in CEnone Haliday, the second the largest; 



marginal cell not quite extending to tip of wing; second discoidal cell 



open at lower ajucal angle (830) (Enonogaslra Ashmead, new genus. 



(Type, Mesocrina microrJiopahe Ashmead. 

 Abdomen with tlic normal numl)er oi segments; marginal cell extending to 



tip of wing (831 ) I'rosaphu Forster. 



