354 REPORT OF STATE GEOLOGIST. 



short, bent abruptly upward, bluntly pointed, and with the apical 

 third finely serrate above. 



Two species occur in the United States, but one of which has, as 

 yet, been taken in Indiana. Since the other, M. retinerve Burm., 

 may in time be found in the southern half of the State, the follow- 

 ing key will enable the student to separate the two: 



KEY TO THE SPECIES OF MICROCENTRUM. 



a. General color bright green; fi'ont border of pronotum sinuate, with a 

 slight rounded median projection; hind femora one-half the length 



of tegmina 87 laurlfolmm, p. 354 



aa. G-eneral color yellowish green; front border of pronotum truncate, 

 without median tooth; hind femora more than one-half the length 

 of tegmina retinerve 



87. MiOROCENTRUM LAURiFCTLiuM ( L. ) The Larger Angular- winged Katy- 

 did. The Oblique- winged Katydid. 

 Gn/llm laurifolim L., 8 1 , 11, 1767, 695, 17. 



Phylloptera iauHfolia Burm., 40, II, 1838, 693; Serv., 196, 1839, 404. 

 MicrocentmmlaurijWuim Brunn., 38, 1878, 334, .339; Bl. , 7,1893, 107; Id., 

 15, 1899, 215, Figs. 47, 49; Beut., 3, VI, 1894, 278, Plate XI, 

 Fig. 3; Lugg., 84, 1898, 224, Figs. 148, 149, 150; Scudd., 188, 

 1900, 70. 

 Mkrocetitrum affiUafum Scudd., 14 1, YII, 1862, 447, Fig. 5. 

 MicroeentnisretinerviaRilej, 115, 1874, 155, Figs. 43-47. 



This is the largest species of "katydid" found in the State, both 

 sexes measuring two inches and more to the tip of the wings. The 

 general color is light, grass green, the body yellowish green, lighter 

 beneath. The vertex is quite broad, with its center hollowed out so 

 as to form a shallow pit, which is more prominent in the male. The 

 pronotum is about as broad as long, its anterior margin a little 

 sinuate and usually possessing a slight median tooth, though this is 



Fig. 85. Microcentum lauri/olium {L.) Male. (After Riley). 



sometimes obsolete, or is replaced with a shallow notch. The over- 

 lapping dorsal surface of the wing covers form a sharp and prominent 

 angle with the lateral portions, whence the common name. 



