358 REPORT OF STATE GEOLOGIST. 



with the closing of the wing covers, run into each other. The whole 

 strongly recalls the slow turning of a child's wooden rattle, ending 

 with a sudden jerk of the same; and this prolonged rattling, which is 

 peculiar to the male, is invariably and instantly answered by a single 

 sharp 'chirp' or 'tschick' from one or more females, who produce the 

 sound by a sudden upward jerk of the wings. 



"Both sexes are for the most part silent during the day, but during 

 the period of their greatest activity their stridulations are never for 

 an hour remitted, from the time the great setting sun hides behind 

 the purple curtains of the west till he begins to shed his scarlet rays 

 in the east — the species being so numerous that the sound as it comes 

 from the woods is one continuous rattling, not unlike the croaking 

 of frogs, but set to a higher key." 



Sub-family PSEUDOPHYLLIN^. 



This sub-family is represented in Indiana by only one genus — 

 characterized as follows: 



XLIV. Cyrtophyllus Burmeister (1838). 



Tegmina broad and leaf-like, longer than the wings, obtuse and 

 rounded at the ends, and concave or hollowed within. The vertex 

 extends forward between the eyes in the form of a small triangular 

 spine which is grooved above and crowded by the basal Joints of the 

 antennae. Eyes small, globose. Prosternum armed with two short 

 spines. Pronotum crossed by two transverse sulci; its "surface rugose; 

 its posterior third highest. Anterior pair of legs long and rather 

 stout and well adapted for climbing. The "shrilling" organ of the 

 male is brown in color, with the central portion as transparent as 

 glass, and is s6t in a strong half-oval frame. Sub-anal plate of male 

 produced into a long paddle-shaped appendage which is grooved on 

 the upper side. Ovipositor of female broad, with the apical half 

 up-curved and denticulate below; apex rather sharply pointed. One 

 species which occurs throughout the eastern United States is com- 

 mon in Indiana. 



88. Cyrtophyllus perspioillatus (L. ) The True Katydid. The Broad- 

 winged Katydid. 

 Gryllm prrxpirilldlii.^f Jj., SO. 1763, 15. 

 Oyrtophyllm perHpirillal n^Biinn., 40, 11, 1838, 697; Brnun., 39», 1896, 



289; Scudd., 188, 1900, 71. 

 Pldtyphyllumconcavum'HaTTis, 72, 1862, 158, Fig. 74; Riley, 115. 1874, 

 167, Figs. 52-54. 



