206 



THE WINGS OF NEUROPTERA 



both cross- veins and the bent veins connecting them come to he in a more or less straight 

 longitudinal line: 



"a) The radial planate traverses the interradial area, crossing the branches of the 

 radial sector, in the direction of the wing apex. [See Figure 202.] 



"&) The trigonal planate traverse the area of the trigonal fork, crossing and uniting 

 the branches that spring from the trigonal vein, to which vein it is more or less closely 

 parallel. The trigonal planate is more or less closely joined at its proximal end to 

 the trigonal arc. 



"8. A median nexus or conjunction of adjacent veins, joins the tip of vein Mi-f-2 

 with the vein on each side of it, and an interradial tiexus in the more specialized Palparinag 

 similarly joins the tip of the first and second branches of the radial sector. 



(5) THE WINGS OF THE ASCALAPHID^ 



Although the family Ascalaphidse is distinctly separated from the 

 Myrmeleonidas, the wings of ascalaphids resemble quite closely those of the 



Fig. 203. 



I rca 



A'ings of Ulnlodes hyalina. 



myrmeleonids. The only feature that sharply distinguishes the wings of 

 ascalaphids from those of mynneleonids is the fact that in the Ascalaphids 

 there is no greatly elongated cell behind the point of fusion of veins Sc 

 and Ri. 



In the Ascalaphidas, the obliquity of the base of vein M3+4 is frequently 

 not well-marked; it is obvious in Ulnlodes hyalina (Fig. 203, o), but in 

 Ogcogaster tesselata (Fig. 204) it is less so. 



In this family the radial cuneate area is always present, although in a 

 few cases, as in the genus Pner, it is small. It is in nearly all cases in^egular 

 in form, as in Ulnlodes (Fig. 203), appearing to be behind the first branch 

 of the radial sector; rarely it has the appearance of being between two 



