410 PROCEEDINGS OF THE ACADEMY OF [April,. 



Borealis group. — General pale coloration. Supra-anal plate of male 

 broadly arcuate. 

 Subgroup. Short, attingent tegmina in 9 . 



10. /. borealis Brunner. 



Subgroup. Lateral lobiform tegmina in 9 . 



11. /. bolliana Sauss. and Zehntner. 



Subgroup. Elongate tegmina, longer than body in 9 . 



12. /. iusolita n. sp. 



Occidentalis group. — General coloration ferruginous to blackish-brown. 

 Supra-anal plate of male produced, obtuse-angulate emarginate 

 distad. 



13. /. occidentalis Sauss. 



Key to Species. 



Males. 



A. — Dorsal color uniform brownish or brownish-black or pronotum 

 alone entirely of that color; tegmina paler, approaching burnt 

 sienna, (Supra-anal plate produced mesad into a broad 

 subtruncate process, lateral angles more or less rounded.) 

 B. — Tegmina same color as pronotum. 



C. — Size larger (male tegmina 16 to 18 mm. in length) 



deropeltiformis (Brunner). 

 CC. — Size smaller (male tegmina 11.5-15 mm. in length). 



D. — Color pitch black or blackish brown. Pronotum some- 

 what produced cephalad, with greatest length con- 

 tained one and one-third times in greatest width. 



Supra-anal plate with distal extremity truncate 



johnsoni Rehn. 

 DD. — Color ferruginous (rarely olivaceous). Pronotum trans- 

 verse subelliptical, with greatest length contained 

 about one and one-half times in greatest width. 



Supra-anal plate with distal extremity rounded 



americana (Scudder). 



BB. — Tegmina pale, pronotum dark nigricollis Walker. 



A A. — Dorsal color not uniform deep brownish or blackish-brown, 

 pronotum with pale lateral margins if center is dark brown. 

 B. — Pronotum with decided central discal dark brown or blackish- 

 brown area of variable size, with lateral margins, at least, 

 translucent or hoary-white. Tegmina dark with trans- 

 lucent or subtranslucent costal region. 

 C. — Supra-anal plate with median produced portion broad. 

 (General color darker.) 

 D. — Median area of pronotum usually not so sharply defined, 

 uniform in color or so broadly confluent with caudal 

 margin; pale lateral portions often very narrow. 



