38 GENERA OF HYMENOPTERA. 



base, and the third receiving the second recurrent, which is straight, 

 a little in front of middle ; j)osterior wing-' well veined ; legs nKwler- 

 ately sh')rt, slender, the four posterior tihite each with two apical 

 spurs, all the tarsi r)-jointed, their claws hiHd ; abdomen attached to 

 the aj)ex of the nietatii(>rax, subsessile, short, ovate, convex, narrowed 

 and suddeidy depressed at base, the u|)ex deflexed, es|K'cially in % , 

 the second segment nmch the largest ; beneath, the large second seg- 

 ment of the % is more or less strongly produced at the apical middle. 



Of this anomalous genus four sjK'cies have been described as oc- 

 curring in our fauna. They are widely distributed and rare, the 

 localities being Ma-ssachusetts, West Virginia, North ('arolina and 

 Nevada. 



Li/rofjmter Shuck., appe-ni-s to be nothing more than the S of 

 Tri(jonuly«. 



Family ICHNEUMONIDiE. 



This very extensive family (the Ichneumones gcnuini Grav.) is dis- 

 tinguished by the well-veined anterior wings (fig. 9, which are rarely 

 rudimentary or wantinjj »> in Pezomachus and allied genera) having 

 the nervure separating the first subniargiiud cell from the first dis- 

 coidal cell either entirely obliterated or else i-educed to a mere stump 

 of a vein (i), whereby the two cells, termed the cubito-discoidal cell 

 (5), become confluent; moreover, the second submarginal cell, or 

 areolet (6), is greatly reduced in size, sometimes petiolate and often 

 entirely obsolete ; the third discoidal cell (9) is always complete 



Fig. 9. — Anterior wing of Ichneumon. 



1, median or externo-medial cell ; a, submedian or interno-niedial cell ; 3, anal cell ; 4, 

 marginal or radial cell ; 5, cubito-discoidal cell ; 6, areolet or second submarginal cell ; 7, 

 third submarginal cell ; 8, second discoidal cell ; 9, third discoidal cell : 10, first apical 

 cell ; II, second apical cell ; a, costal and subcostal nervures blended ; b, externo-medial 

 nervure ; c, anal nervure ; d, basal nervure : e, marginal or radial nervure ; f, first trans- 

 verse cubital nervure ; g, second transverse cubital nervure ; h, transverse medial ner- 

 vure; i, abbreviated cubital nervure or "stump of a vein"; j, discoidal nervure; k, 

 cubital nervure ; 1, recurrent nervures ; m, subdiscoidal nervure ; n, stigma. 



