FAMILY VI.-LOCUSTID^. 



227 



male is a spine, resembling in appearance the cerci, which 

 curves beneath the projecting sub-anal plate. 



Measurements.— Length of body, 30-35 mm.; wing-cov- 

 ers, 33-36 mm., posterior femora, 19-21 mm. 



The true Katydids, Figs. 151 and 152, of which several 

 species occur in the United States, differ greatly from other 

 Katydids by having the wings shorter than the wing-covers, 



Fig. 151. — Cyrtophyllus conca- 

 vus, male. After Harris. 



Fig. 152. — Cyrtophyllus concavus, 

 female, a, ovipositor, nat. size, b, tip 

 of same, enlarged. After Riley. 



which latter are ver}' convex, thus giving the insect an in- 

 flated appearance. The whole shape of the insect indicates 

 that it can produce a large volume of sound, being almost 

 a sort of sounding board. The structure of the insect also 

 shows that it is decidedly arboreal in habit, the green color 

 well blending with the foliage of the tops of trees where it 



