No. 34-] PIEMIPTERA OF CONNECTICUT I NABIDAE. 67 1 



Key to Subfamilies. 



Pronotum with anterior transverse impression very close to front 

 margin, or lacking; apical collar none or very narrow; clavus 

 not or scarcely widened posteriorly Prostemminae 



Pronotum with anterior transverse impression more distant from 

 front margin ; apical collar wide ; clavus widened posteriorly . . 



Nabinae 



Subfamily Prostemminae. 



Species having eyes contiguous with pronotal margin; claval 

 commissure shorter than scutellum ; embolium present ; front 

 tibiae with very distinct spongy fossa. One genus occurs in our 

 region. 



Pagasa Stal. 



Shining species of oblong, anteriorly narrowed form, with sparse 

 erect pubescence ; membrane, when developed, with three elongate 

 cells. One species occurs in our fauna. 

 P. fusca (Stein). 



Berl. Ent. Zeit, i, 90, 1857. 



Black ; antennae and membrane dark brown ; rostrum and legs 

 yellow to dark brown, femora paler at apex, surface shining. 

 Length 6-6.5 ^^- Usually found under stones. 



Lyme, 20 Aug., 1910 (A. B. C.) ; New Canaan, 23 Sept., 1910, winged 

 form (W. E. B.). 



Subfamily Nabinae. 



This group contains most of our species ; eyes distant from pro- 

 notal margin; rostrum slender; pronotum with a broad apical 

 collar, clavus widened posteriorly, the commissure much longer 

 than scutellum; spongy fossa of front tibiae rudimentary. One 

 tribe is represented within our limits. 



Tribe NABINI. 



This group includes all but one of the North American species 

 of the subfamily. 



Key to Genera. 



First antennal segment not longer tlian head; membrane generally 

 with three elongate discal cells Nabis 



First antennal segment twice as long as head; membrane without 

 closed discal cells Metatropiphorus 



Nabis Latreille. 



Numerous species of brownish or rarely shining black colora- 

 tion ; pronotum conical in general shape, moderately constricted at 

 or behind middle ; membrane when developed, generally with three 

 elongate discal cells from which short veins radiate toward mar- 

 gins; front femora usually without spines; the species are often 

 dimorphic or polymorphic, the hemielytra more or less reduced. 



