78 STRIDULATING ORGANS AND THE EAR. 



has studied in detail the organs that produce sounds in in- 

 sects, and some of the illustrations are copied from his paper. 

 The Meadow Grasshoppers, Katydids and Tree-Crickets 

 produce sounds in a different way from the locusts. Here 

 also the males alone can produce love songs and thej^ alone 

 possess peculiar organs for this purpose. The upper wings 

 of the male are entirely different from those of the female, 

 which have^the usual form. In the male large veins divide 



Fig. 45. — Wings of male grasshoppers. — A , Orcbeliwum agile; B, Xiphjdium 

 fnsciatutn; C, Amblycorypha oblongilolia. Original. 



the wing into disk-like or drum-like spaces. Fig. 45 shows 

 the upper wings of three species of grasshoppers, and Fig. 46 



Fig. 46 — Wings of male 

 cricket; s, vein with teeth; 

 s a, scraper. After L,andois. 



Fi?. 47. — Stridulating 

 ridges in .1 field cricket. 

 After lyandois. 



^e 



Fig. 47 A. — Stridulat- 

 ing ridges in a house- 

 cricket; s, stridulating 

 ridge; st. stridulating 

 teeth. After Landois. 



the Upper wing of a criclvct. The principal vein extendmg 

 diasonallv across the base of the wing, is furnished with 



