1894.] NATURAL SCIENCES OF PHILADELPHIA. 305 



Tribe VII.— BOTHYNOSTETHINI. 



Marginal cell truncate, with an appendiculation; eyes converging 

 towards vertex; hind femora not thickened at apex 



PLENOCULLiS Fox. 



Marginal cell pointed at tip, without appendiculation; eyes diverging 

 towards vertex : hind femora, especially in 9 , thickened at 



apex BOTHYNOSTETHI'S Kohl. 



Tribe VIII.— ASTATINI. 



This tribe is formed of the genus Astatnx, and is based chiefly on 

 the strantre disposition of the eyes of the male sex ; they meet on 

 the vertex, a characteristic not found in any other genus of the 

 fossorial Hymenoptera, and not, as far as I know, in any genus of 

 tlie Order. 



Tribe IX.— DIPLOPLECTRINI. 



The genus Diploplectron forms this tribe. The chief characters 

 are that both sexes have the middle tibiio two spurred, the veiy 

 short subniarginal cell and the prominent and very long prothorax. 

 It is evidently allied to the European genus Dinetus, which probably 

 belongs to this tribe. As the latter is the older genus, the name 

 proposed for this tribe will have to give way to Dinetini, but as 

 Dinetus does not occur in North America, and as this is simply a 

 classification of the forms inhabiting that region, I prefer to use the 

 name proposed above. 



Tribe X.— MI8COPHINI. 



Wings with two subinarginal cells, the first receiving a recurrent ner- 

 vure; marginal cell acuminate, not appendiculate; eyes converg- 

 ing but little or not at all towards vertex . . . Miscofhts Jur. 



Wings with three subniarginal cells, both recurrent nervures being 

 received by the second subniarginal cell; marginal cell elongate, 

 truncate at apex and appendiculate; eyes strongly converging 

 towards vertex Niteliopsis tSaund. 



Tribe XI.— LYRODIXl. 



Lyrodn, upon which this tribe is based, might be placed in the 

 Larrini, were it not for the regularly formed and distinct ocelli. 

 The only other character worth mentioning in which it differs from 

 the following tribe, is the peculiar shape of the prothorax above, 

 which is lieiag apparently twice emarginate, with the intervening 

 space strongly developed. 



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