112 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Key to Species. 

 Males. 



1. Tegmina at most but little longer than the pronotum 



(Fig. 38) 2 



Tegmina much longer than the pronotum 3 



2. Cerci slender, clasp-like, about four times as long- as the 



breadth at middle (Fig. 38). Furcula well developed 

 but short. Median carina of pronotum indistinct on 



the prozona mancus 



Cerci broad, sub-triangular, less than three times as 

 long as the breadth at middle (Fig. 38). Furcula 

 usually very short. Median carina of pronotum dis- 

 tinct throughout scudderi 



3. Cerci not broadened apically, of about uniform width or 



tapering towards the apex 4 



Cerci irregular in shape, broadened apically or forked 6 



4. Apex of sub-genital plate not notched. Cerci long, 



three or more times the breadth at middle 5 



Apex of sub-genital plate with a median notch. Cerci 

 short, not longer than twice the breadth at middle, and 

 nearly equal throughout (Fig. 4Oa) atlanis 



5. Furcula much longer than the last abdominal segment 



to which it is attached. Cerci tapering, the apical 

 half less than one-half as broad as the extreme base 



(Fig. 42a) femur-rubrum 



Furcula short, no longer than the last abdominal seg- 

 ment to which it is attached. Cerci nearly straight, 

 and of nearly uniform width throughout (Fig. 44a) 



fasciatus 



6. Cerci either distinctly forked or with a sub-median 



angulation 7 



Cerci with the apical half much enlarged, but not 

 distinctly forked 8 



7. Lower fork of cerci merely an angle or median process 



(Fig. 45a). Furcula consisting of slender spines, .minor 

 Cerci distinctly forked, the lower branch narrower 

 (Fig. 46a). Furcula consisting of short triangular 

 lobes . . luridus 



