1918] Barber — Synoptic Keys to the Lygcndoe (Hemiptera) 77 



II. Posterior tarsus with basal segment not more than 

 twice as long as second and third together. Hind 

 tibia with long setose hairs similar to those of an- 

 tennae and provided with a few rigid bristles api- 

 cally. Form of body more broadly oval with 



shorter legs Perigenes Dist. 



CC. Head not at all or scarcely exserted, commonly immersed 

 to the eyes. Pronotum without a constricted ring-like 

 collar, at most with anterior margin depressed or furnished 

 with a series of punctures. Clavus with three rows of 

 punctures. 



J. Scutellum much longer than wide and posteriorly 

 distinctly carinate. Pronotum strongly con- 

 stricted to form two lobes, both of which are 

 punctate; the disk of the anterior lobe sometimes 

 more sparsely so. Posterior tarsus with the basal 

 segment subequal to the second and third together. 

 Species rarely pilose. 

 K. First segment of antenna longer, exceeding apex 

 of tylus by one-half its length. Within anterior 

 margin of pronotum depressed, punctate. Basal 

 disk of scutellum depressed before a premedian 

 transverse or crescentic ridge, posteriorly to 

 which, carinate. Fore femora armed with several 

 teeth. Males sometimes with fore tibia armed 

 with a median tooth. In brachypterous forms 

 the membrane may be almost or entirely wanting, 

 the clavus flat, not deflected to the corium and 

 the anterior lobe of the pronotum swollen and 

 more than twice the length of the posterior. 

 Species not at all or only slightly shining. (To 

 include Carpilis ferriiginea Stal. and Sisamnes 



contractus Dist.) Ptochiomera Say . 



KK. First segment of antennae short scarcely exceed- 

 ing the tylus. Anterior margin of pronotum not 

 depressed. Basal disk of scutellum depressed 

 followed by a longitudinal carina. Incrassate 

 fore femora armed with two or three preapical 

 teeth one of which is frequently enlarged. In 



