REHX AND IIEBARD 69 



the cephalic constriction of the lateral carinae (viz. greatest — 

 Shaver's Mountain, West Virginia; least — Pinnacle Peak, Geor-" 

 gia) are compared, no correlation with the ratio of the greatest 

 (caudal) width to length is found. Of the extremes of constric- 

 tion, one (Pinnacle Peak) shows the greatest or 78 per cent of 

 greatest width ratio, the other (Shaver's Mountain) shows a 

 proportion (73 per cent) much nearer this figure than, as one 

 would imagine, to the other extreme of the series. The lack of 

 correlation of the two features is quite evident. Of the females 

 the Lake Toxaway paratype is relatively the narrowest over all. 

 The Shaver's Mountain male has the least width of the pronotal 

 disk contained two and one-third times in the greatest (caudal) 

 width of the same, while the Pinnacle Peak male has the same 

 proportions one and five-eighths times. The Washington 

 County, Virginia, female has the same proportion one and two- 

 thirds times and the Lake Toxaway specimens both show one 

 and two-fifths. The cephalic margin of the pronotal disk varies 

 from subtruncate to very shallowly subangulate emarginate. 

 The caudal margin of the disk is moderately arcuate to arcuate- 

 truncate with the lateral sections of this margin strongly arcuate. 

 The lateral lobes of the pronotum show a well marked humeral 

 sinus in both sexes, but the degree of indentation is variable. 



The male tegmina vary but slightly in the degree of production 

 caudad of the pronotum, while the vestigial female tegmina are 

 well concealed. The disto-dorsal abdominal segment of the male 

 is always angulate emarginate, the degree of the same varjdng 

 from obtuse to nearlj^ rectangulate. The supra-anal plate of the 

 male varies greatly in form, from broad semi-elliptical to sharply 

 rectangulate in outUne, the medio-longitudinal sulcation contin- 

 uous or limited to the proximal section. The cerci of the male 

 vary appreciably in robustness and to a lesser degree in relative 

 length, while the tooth is always disto-median in position and in 

 form moderately incrassate and relativel}^ uncinate; the distal 

 section of the cercus shows some variation in attenuation. The 

 male subgenital plate, as in most of the forms of the genus, shows 

 a considerable degree of variation in the character of the emar- 

 gination of the distal margin, this ranging from nearly truncate 

 to U-emarginate, while the styles vary as much in length as in 

 davisi, one male (Black Mountain) having them present as the 



TRANS. AM. ENT. SOC, XLII. 



