THE GRASSHOPPER'S COUSINS 



plicated sensory receptive apparatus (B) connected by a 

 nerve through the basal part of the leg with the central 

 nervous system. 



There are several groups of katydids, classed as sub- 



EC! 



CC1 



-Ct 



A 



Fig. 20. The probable auditory organ of the front leg of Dectkus, 

 a member o( the katydid family. (Simplified from Schwabe) 



A, cross-section of the leg through the auditory organ, showing 

 the ear slits (e, e) leading into the large ear cavities (E, E) with 

 the tympana (Tm, Tm) on their inner faces. Between the 

 tympana are two tracheae {Tra. Tra) dividing the leg cavity into 

 an upper and a lower channel {BC, BC). The sensory apparatus 

 forms a crest on the outer surface of the inner trachea, each ele- 

 ment consisting of a cap cell (CCl), an enveloping cell (EC/) con- 

 taining a sense rod (Sco), and a sense cell (SC/). Ct, the thick 



cuticula forming the hard wall of the leg 



B, surface view of the sensory organ, showing the elements 

 graded in size from above downward. The sense cells (SCt) are 



attached to the nerve (Nv) along the inner side of the leg 



families. A subfamily name ends in inae to distinguish it 

 from a family name, which, after the Latin fashion, termi- 

 nates in idae. 



THE ROUND-HEADED KATYDIDS 



The members of this first group of the katydid family 

 are characterized by having large wings and a smooth 



[37] 



