CHARLES W. HOOKER, J 



Some European writers have added much confusion to our 

 knowledge of this tribe by describing numerous new species 

 from America without a proper knowledge of those already 

 described. Many of these descriptions are too brief to make 

 identification possible, and others are clearly synonyms. 



Mr. H. M. Russell began work on this tribe, and in 1906 

 offered a senior thesis on the genera Agathophiona, Enicos- 

 pilus, Eremotylus, Ophion, Ophiopterus oxidi Thyreodon Q.S, re'pxe- 

 sented north of the Isthmus of Panama. Upon his accept- 

 ance of a position with the Bureau of Entomology at Wash- 

 ington, his material was placed in my hands, and the bibli- 

 ographies he had prepared and some other portions proved 

 very useful. As he had studied almost none of the types, 

 however, and had not completed studies on any of the 

 species, it became necessary to repeat all he had done, and 

 therefore I must assume responsibility for any errors or 

 deficiencies discovered in this paper. 



Table of Tribes.* 



1. Second recurrent nervure joining the cubitus behind the transverse 



cubitus, or interstitial with it ; middle tibise always with two 



apical spurs Other (Non-American) Tribes. 



Second recurrent nervure joining the cubitus before the transverse 

 cubitus, or it is entirely wanting {Pharsalia Cr.); if it joins 

 the cubitus behind the transverse cubitus then the middle 

 tibiae have but a single apical spur 2. 



2. Middle tibiae with two apical spurs ; second recurrent nervure join- 



ing the cubitus before the transverse median nervure 3. 



Middle tibise with only one apical spur ; second recurrent nervure 

 joining the cubitus behind the transverse cubitus or entirely 

 wanting Tribe Nototrachini. 



3. Antennae short, clavate ; mesosternum beneath flat, mesonotum 



without parapsidal furrows. 



(Non-American) Tribe FIkllwigiini. 

 Antennae long, subsetaceous (filiform); mesonotum usually with dis- 

 tinct parapsidal furrows Tribe Ophionini. 



* It has not seemed necessary to include tables from the Family 

 Ichneumonidae since any one using this paper will undoubtedly be able 

 to recognize Ophionini, but such if desired can be found in Proc. U. S. 

 Nat. Mus., No. 1206, pp. 10, 85 (Vol. 23, 1901), 1900. The table of 

 tribes given here is that of Ashmead, slightly rearranged and modified. 



TRANS. AM. ENT. SOC. , XXX VIII. 



