REHN AND HEBARD 49 



very shallowly obtuse-angulate emarginate. The greatest width 

 of the pronotal disk in the female equals 63 to 73 per cent the 

 length of the same, while the caudal margin is always subtrun- 

 cate, at least so mesad. The least width of the pronotal disk, 

 i.e. at the cephalic fourth, is, in both sexes, equal to from tV to f 

 of the greatest (caudal) width of the same. The tegmina of the 

 male vary but little in length, as shown by the measurements; the 

 apices of the tegmina are well rounded. In the female the teg- 

 mina reach almost or quite to the caudal margin of the pronotal 

 disk, but are always covered by the same. The abdomen is 

 moderately (d^) or quite faintly ( 9 ) tricarinate. 



The disto-dorsal abdominal segment of the male is generally 

 angulate-emarginate, the degree of same varying and occasionally 

 the angle is rounded; supra-anal plate of the male is in general 

 form trigonal, occasionally with the angle somewhat rounded, a 

 medio-longitudinal sulcus present on the same and more dis- 

 tinctly indicated proximad. The cerci of the male varj'- slightly 

 in robustness, particularly in the distal portion, the tooth also 

 showing some slight variation in its exact position and in the 

 sharpness and falcation of the same. The subgenital plate of 

 the male has the distal margin varying from subtruncate to rec- 

 tangulate-emarginate, generally somewhat rotundate-angulate, 

 the styles varying appreciably in length. 



The supra-anal plate of the female varies somewhat in tht 

 degree of angulation, the sulcus indicated as in the male. The 

 ovipositor is fairly uniform in length, the variation in this, as 

 illustrated by the measurements, being individual. One rep- 

 resentative from Moline, Illinois, has the longest ovipositor 

 (23 mm.), next to which stand two females from Guthrieville 

 and Malvern, Pennsylvania (22 mm.). In the depth of the ovi- 

 positor there is some variation but not sufficient to change the 

 general form of the same. The subgenital plate of the female 

 has the form constant and shows no noteworthy variation from 

 that figured. 



The caudal femora in both sexes of the present species are 

 quite short, in fact relatively shorter than in any other form of 

 the genus. While there is some variation in the length, aside 

 from that which is proportional, it is of a negligible quantity. 



TRANS. AM. ENT. SOC, XLII. 

 2 



