1918] Barber—Synoptic Keys to the Lygevidw (Hemiptera) TT 
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- 
tennze and provided with a few rigid bristles api- 
cally. Form of body more broadly oval with 
shorter Hogs. use. aeeetiag odie: 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 
I 
KK. 
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. 
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 ferruginea Stal. and Sisamnes 
contractis. DASE) ofits 4...) 1? Ptochiomera Say. 
First segment of antennz 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 
