SUBFAMILY VII. — RHYPAROCHROMIN^. 421 



equilateral without median carina ; elytra covering sides of 

 abdomen, usually brachypterous, the membrane in our single 

 eastern species, small, reaching middle of fifth dorsal; front 

 femora swollen, armed beneath with two small teeth. 



370 (584). Plinthisus compactus (Uhler), 1904, 354. 



Elongate-oblong, widest behind middle of abdomen. Head, front 

 lobe of pronotum, scutellum and under surface dark chestnut-brown ; 

 hind lobe of pronotum, corium and clavus reddish-brown punctate with 

 fuscous; membrane brownish-hyaline; antenna? piceous, the basal joint 

 and part of third paler; beak and legs reddish-brown. Beak reaching 

 middle coxa?. First joint of antennae exceeding tip of tylus by one-half 

 its length ; second longest, subclavate, third and fourth subequal. Prono- 

 tum as in key, the front angles rounded. Scutellum finely punctate. 

 Claval suture present. Costal margin of corium widened and reflexed to 

 apical fourth. Front tibia? of male strongly curved, its inner apical angle 

 prolonged. Length, 3 — 3.5 mm. 



Indian Lake, Sabael, N. Y., Aug. 11 (Barber). Described 

 from New Mexico. Known from Ontario, New Hampshire, 

 Massachusetts and New York. The P. americanus Van D. (1910, 

 75) is, according to Barber (1918d, 109), a synonym. 



V. Stygnocoris Douglas & Scott, 1865, 213. 



Small oblong-oval, densely punctate pubescent species, hav- 

 ing the head wider across the eyes than front margin of prono- 

 tum ; antennae slender, first joint slightly surpassing apex of 

 tylus, second longest, third and fourth subequal in length, the 

 latter fusiform; beak reaching middle coxae; pronotum with 

 side margins narrowly carinate ; clavus with four rows of punc- 

 tures; fore femora unarmed. Two introduced palaearctic Eu- 

 ropean species occur in our territory. 



KEY TO EASTERN SPECIES OF STYGNOCORIS. 



«. Femora piceous-brown ; larger, 3 — 3.8 mm. 371. rusticus. 



aa. Legs wholly pale ; smaller, not over 3 mm. 372. pedestris. 



371 (588). Stygnocoris rusticus (Fallen), 1807, 70. 



Oblong-oval. Above dull black, thickly clothed with subappressed 

 yellow pubescence, costal area with edge paler; under surface black, more 

 shining, more sparsely pubescent; antennae reddish-brown, the apical 

 joint fuscous; femora fuscous-brown, tibia? and tarsi somewhat paler. 

 Head and thorax densely, coarsely punctate, the latter with a vague 

 median transverse impression. Scutellum and elytra more finely, less 

 densely punctate. Brachypterous forms with membrane very short, 

 reaching fifth dorsal. Length, 3 — 3.8 mm. 



