REHN AND HEBARD 183 



compared under the latter species. Females of the two species 

 are difficult to separate, but, in addition to a somewhat different 

 facies, this sex of brevipennis is found to have the ovipositor aver- 

 aging distinctly longer and straighter. 



Lateral lobes of pronotum moderately broad, cephalic margin 

 straight to the broadly obtuse-angulate ventro-cephalic angle, 

 thence straight to the rather broadh rounded ventro-caudal 

 angle which is slightly less than 90°, caudal margin weakly con- 

 vex to the distinct humeral sinus, convex callosity moderately 

 broad. 



Though the distinctive male cerci of this species usually show 

 little or no variation, a single specimen in the series from Corn- 

 wells, Pennsylvania, has the apex of these organs acute and very 

 nai-rowly rounded, an abnormality found in no other male of the 

 species before us. 



The tegmina in the males usually just reach the bases of the 

 brown cerci, in the females they are shorter, covering usually 

 about two-thirds of the dorsum of the abdomen; somewhat 

 greater tegminal abbreviation sometimes occurs, however, and 

 macrQpterism very rarely takes place, this condition being rep- 

 resented in 3.2% of the examples in the series here recorded, 

 7 males and 11 females. 



The genicular areas of the caudal femora are usually weakly 

 infuscated in the present species; the genicular lobes of the same 

 are normally bispinose but frequent examples are met with which 

 have one, two or three of these lobes unispinose, examples are 

 very rare in which all of the genicular lobes of the caudal femora 

 are unispinose. The ventro-external margins of the caudal 

 femora are normally unarmed, small spines are present in three 

 hundred and forty-one perfect specimens examined as follows: 

 Number of spines, 0-0 0-1 0-2 0-3 1-1 1-2 1-3 2-2 2-3 2-5 



Number of specimens, 267 43 6 1 116 1 4 1 1 



This shows 21.7% of the material to have these margins 

 armed; as in fasciatus, geographic distribution apparently does 

 not influence this condition, but in the present species the spines 

 when present are usually heavier than in that insect. 



The ovipositor length is as follows: Saunderstown, Khode 

 Island, 9.1-10.8; Diamond Valley, Pennsylvania, 11.6-12.7; 

 Cornwells, Pennsylvania, 10.3-13.4; Chestnut IIi!l, Pennsylvania, 



TRANS. AM. ENT. SOC, XLI. 



