THE WINGS OF BEROTHID^ 187 



only a narrow area between these veins and the margin of the wing, which 

 is largely occupied by the fanlike branched portion of the accessor}- veins. 



In Berotha the subcosta enters the pterostigma and then atrophies; the 

 tip of the preserved portion is distinct from vein Ri ; the accessory branches 

 of the atrophied portion are preser\^ed, but are free at the base. A short 

 distance before the end of the preserved portion of the subcosta there is a 

 cross-vein extending from the subcosta to vein Ri. In some allied genera 

 veins Sc and Ri become united at this point so that they appear to coalesce. 



The loss of vein Cu2 of the hind wings occurs also in the hemerobiids, 

 where all stages of the atrophy of this vein are to be found. 



There are several genera of Netiroptera that present the same type of 

 wing-venation as that shown by the wings of Berotha, and which, for this 

 reason I believe should be included in the family Berothidae. These are the 

 following : Loniamyia, Spennophorella, Trichoma, and Stenobiella. 



The most available recognition characters of this family are presented 

 by the hind wings, these are the following: the transverse course of the 

 first radio-medial cross- vein; the absence of vein Cu^; the narrowness of 

 the area of the wing between A-eins istA and Cui and the margin of the wing, 

 this area being largely occupied by the fanlike tips of the accessory veins ; 

 and a bend in the outer part of the first anal vein which results either in an 

 anastomosis of this vein with vein Cui or in these two veins being closely 

 approximate where they are joined by a cross-vein. 



The shape of the wings varies greatly in this family; in Berotha, 

 Loniamyia, and TricJioma the wings are falcate; in Spermophorella they are 

 oblong, with the terminal portion rounded; and in Stenobiella, they are 

 ver\^ long and narrow. 



In Berotha the temiinal portion of the subcosta is atrophied and the tip 

 of the preserved portion is free; in Lomamyia and SpermopJiorella, the tip 

 of the subcosta joins vein Ri ; and in Trichoma and Stenobiella the subcosta 

 ends in the margin of the wing. 



The representatives of this family are widely distributed. Berotha is 

 found in India, Lomamyia is represented by two species in the United 

 States, and the other three genera are Australian. 



(/) THE WINGS OF THE POLYSTCECHGTID.^ 



The wings of our covamon Polystoochotes punctatns (Fig. i8i) represent 

 the type of wing-venation characteristic of the family Polystoechotidai. In 

 these wings the humeral cross-vein is recurved and branched; veins Sc 

 and Ri coalesce at the tip; the radial sector is pectinately branched; the 

 number of cross-veins is greatly reduced; but there is in both fore and hind 

 wings a very perfect series of gradate veins; and marginal dots are present, 

 these are not represented in the figure. 



