116 PIMPLINE ICHNEUMONIDAE 



is marked by a longitudinal mid-ventral groove, as in the meso- 

 thorax, and is continuous with it. 



Wings 



The wings are long and narrow, quite large, usually hyaline* 

 marked more or less with dark spots. In some species the wings 

 are entirely cloudy. The fore and hind wings are connected 

 when in flight, by a row of frenal hooks on the hind wing hooking 

 into the frenal fold of the front wing. 



In describing the veins and cells, the terminology used by 

 Cresson in his "Synopsis of the Hymenoptera of North America," 

 will be followed here. 



In the fore wing, the costal and subcostal veins are blended, 

 therefore the costal cell is absent. They extend to a point a 

 little beyond the middle of the wing, where there is a slight 

 notch in the costa. From this notch, to a point about half 

 way from it to the apex, is a thickened, darker strip which may 

 be regarded as the stigma. Behind the blended costa and sub- 

 costa, lie the externo-medial and anal nervures. The externo- 

 medial nervure at its outer end, meets the basal nerve obliquely; 

 this basal nervure joins the subcosta at a point a little before the 

 stigma. The cell outlined by these nervures is called the sub- 

 median or interno-medial cell. The anal nervure lies behind 

 the externo-medial nervure and extends outward until it joins 

 the anal margin at a point nearly two-thirds the length of the 

 wing from the base. At the junction of the basal nervure with 

 the externo-medial nervure, the transverse-medial nervure 

 extends at nearly a right angle with the latter, to the anal nerv- 

 ure; thus outlining the sub-median or interno-medial cell. 

 Behind the anal vein and in front of the anal margin lies the 

 long, narrow, anal cell. The marginal or radial nervure appar- 

 ently arises from the hinder edge of the stigma and extends 

 toward the apex, but before reaching it, turns forward to the 

 front margin, thus enclosing the marginal or radial cell. The 

 cliscoidal nervure extends from the junction of the externo- 

 medial, basal, and transverse-medial nervures, outward until 

 it joins the cubital nervure, where it bends abruptly backward 

 and joins the anal nervure just before the latter reaches the anal 

 margin. The cell outlined by the transverse-medial nervure 



