1918] Barber — Synoptic Keys to the Lygwida (Hemipfera) 83 



D. The posterior lobe of the pronotuni and corium pale, 

 distinctly and rather coarsely punctate with black; the 

 lateral explanate margins pale; pronotum narrowed in 

 front, the lateral margins gently rounded anteriorly. 

 Antennae pilose. Anterior tibia, especially in the male, 



curved at base Trapezonotus Fieb. 



DD. The posterior lobe of the pronotum concolorous with the 

 anterior lobe, not at all or obsoletely and finely punctate, 

 black or at most with the posterior margin only pale. 

 Corium for the most part pale, more or less infuscated. 

 Lateral explanate margins of the pronotum most com- 

 monly pale, rarely black; pronotum less narrowed in 

 front, the lateral margins more nearly parallel. Antennae 

 nearly nude. Anterior tibia nearly straight. (Type — 

 Trapezonotus rufipes Stal and Rhyparochromus sodalicius 



Uhl. etc.) Malezonotus Barb. 



CC. Explanate pale lateral margins of the pronotum, provided 

 with a few punctures set with long setae. Scutellum most 

 commonly bivittate with pale. Antennae provided with 

 numerous setose hairs. First segment of posterior tarsus 

 commonly subequal to the second and third together. 



Sphragisticus Stal. 

 BB. Entirely black, or the legs rarely pale. Subshining. Pro- 

 notum very transverse, not depressed p steriorly; anterior 

 margin lightly concave. Third segment of the rostrum 

 shorter than the second. Anterior femora armed with one 

 large preapical spine, preceded and followed by one or two 

 smaller spines. Clavus with four series of punctures, the 

 two middle series abbreviated and confused. Posterior 

 tarsus with basal segment subequal to second and third 

 together. Macropterous forms only known to me. {Apha- 



nus umhrosus Dist.) Aphanus Lap. 



AA. Lateral margins of the pronotum more lamellarly expanded 

 and plainly reflexed, the expansion widened between the two 

 lobes which are very obviously separated by a transverse 

 constriction; posterior lobe depressed and profusely punctate; 

 anterior margin straight, within, provided with a depressed 

 series of punctures. Head scarcely transverse; antenniferous 

 tubercles, seen from the side, obliquely declivous. Anten- 



