1917] Barber—Synoptic Keys to the Lygwide (Hemiptera) 131 
GG. Membrane with the two interior 
veins not connected anteriorly by a 
transverse vein; all veins running 
from the base, sometimes posteriorly 
reticulate. Posterior margin of the 
pronotum straight before the scutel- 
lum. Fore femora much swollen 
and armed with numerous teeth 
Pachygronthine Stal. 
FF. The anterior femora not so incrassate 
as in the preceding and armed with a 
single tooth. Corium expanded, wider 
than abdomen; exterior vein sub-parallel 
with margin of corium. Buccule ex- 
tended through the head. Antenne in- 
serted close to bucculee. Posterior coxze 
widely separated...... Oxycarenine Stal. 
AA. The suture between the third and fourth ventral segments of 
the abdomen most commonly curved anteriorly and not reaching 
the lateral margins. Head commonly provided with two setie 
near eyes. Fore femora swollen and armed with teeth 
Rhyparochromine Stal. 
Key to the Tribes and Genera of the Subfamily Lyge@ina. 
A. Apical margin of the corium straight, not sinuate inwardly. 
Exterior apical angles of antenniferous tubercles obtuse or 
sub-obtuse. Last dorsal segment of the male truncate. Genital 
segment of the males not foveate......... Tribe Lyg@ini Stal. 
B. Basal segment of antenne just surpassing the apex of the 
tylus. Rostrum not extending beyond the first segment 
of the abdomen. Head short and broad. 
C. Posterior margin of pronotum before scutellum sin- 
uate; carinate anteriorly in the middle. Scutellum 
more or less tumid and carinate apically 
Oncopeltus Stal. 
CC. Posterior margin of pronotum truncate; without a 
median keel or with keel not reaching the anterior 
margin. Scutellum not tumid, with a longitudinal 
keel, commonly joined to a transverse keel at base. 
Lygeus Fab. 
