296 



AN INTRODUCTION TO ENTOMOLOGY 



vein R2+3-t-4 is bent forward near its base and is joined to vein Ri. 

 The extendinjT of the union of veins Ri and R2+3+4 from the point 

 where they now anastomose towards the base of the wing, so as to 

 obhterate the small cell between them, and also towards the apex of 



Pig. 334. — Wings of Megalomus mcestus. 



the wing for a certain distance, would produce the condition that exists 

 in the fore wing. 



The wings of Hemerobius represent a comparatively simple type 

 of hemerobiid wings; those of Megalomus mosstiis (Fig. 334), a more 

 complicated one. Here there have been developed a larger number 

 of definitive accessory veins and of marginal accessory veins. 



Under the title "A Revision of the Nearctic Hemerobiidae" Mr.N. 

 Banks ('05) has published an account of this family, the two preceding 

 families, and the three following families, in which all of our species 

 known at that time are described. 



