6 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



Abdominal segments 2 and 3 flexible, the abdomen very elongate, nar- 

 row, and strongly compressed; first cubital and first discoidal cells 

 always confluent. {Pharsalia Cresson.) 



Family LXXVI. Ichneumoxidje. 



6. Antenna^ inserted close to the clypeus; hind femora most frequently swollen, 



and usually, 1)ut not always, toothed beneath. 



Family LXXIX. 8tephanid,e. 



7. Mandibles attached abnormally, the tips turned outwardly and not meeting 



when closed Alysiidje. 



Mandibles attached normally, the mandibles Avhen closed meeting or crossing 



each other. 



Abdominal segments 2 and 3 flexible Ichneumonid^. 



Abdominal segments 2 and 3 rigid, connate, not flexible BRACoxiDiE, 



All abdominal segments flexible {Aphldlnx) Bkaconid.e (part). 



Family LXXIV. EVANIID^E. 



1802. EmnUiles Latreille, Hist. Xat. Cms. et Ins., Ill, p. 328. 



1815. Evanides Leach (part), Edinb. Encyc, IX, p. 142. 



1838. Evaniadce, Family I, Haliday, Ent. 3Iag., V, p. 212. 



1839. Evaniadsc, Family 8, Haliday, Hym. Synop., p. ii. 



1839. Shuckard, Newman's Entomologist, I, p. 120. 



1840. Evaniidis, Family 2, Westwood, Intro. Mod. Class Ins., II, p. 124. 

 1883. Evaniales Thomson, Opus. Ent., IX, p. 844. 



1887. Evaniidas Cresson, Syn. Hym. Xorth America, p. 36. 

 1889. Schletterer, Ann. k. k. Naturh. Hofmus., IV, p. 115. 



1900. Ecaniida:, Family LXXIV, Ashmead, Smith's Insects of New Jersey, p. 

 563. 



This family is readily distinguished from all the others by the attach- 

 ment of the al)domen. The al^domen is, as a rule, strongly compressed, 

 petiolate, and attached to the dorsum of the metathorax, either just 

 back of the scutellum or posteriori}^ upon or near the superior margin 

 of the truncature, but never normally at apex, between the hind coxa?, 

 as in all other ichneumonids, with but two or three exceptions. It is 

 further distinguished from all the other families, except the Stephanidre, 

 b}' having a d/strnct costal e<U in the front wings, the costal and sub- 

 costal veins, unlike other ichneumonids, being distinctly separated. 



The family is usually divided into two subfamilies, but I have here 

 recognized three major groups, separable upon good structural char- 

 acters, and further supported by their economy or different habits of 

 the species composing them. 



These three subfamilies may be easily recognized by the aid of the 

 following table: 



TABLE OF SUBFAMILIES. 



Antennpe inserted far anteriorly just above the clypeus 2 



Anteniiie inserted far above the clypeus on, or very near the middle of the face. 



Front wings vyithout or at most with only one recurrent nervure; venation in 

 hind wings wanting or indistinct, withoat a median cell. 

 Pronotum very short, transverse linear and abruptly truncate anteriorly; 

 abdomen attached by a petiole to the superior margin of the metatho- 



