1917] Barber—Synoptic Keys to the Lygewide (Hemiptera) 129 
Europe,’’ Ofv. Vet.-Akad. Férh., 1872, and Enumeratio Hemip- 
terorum, Part 4, 1874. As Van Duzee’s excellent “Check List 
of the Hemiptera of the United States,’’ recently published, will 
be used for reference I have adopted his system of nomenclature 
and order of arrangement. However, I have found it necessary 
to transfer the genus Orsillacis Barb. to the Tribe Lygeini. Part 
II will include the Subfamily Rhyparochromine or Aphanine. 
I desire to express my appreciation to Dr. W. E. Britton, who 
makes the publication of these keys possible and to Mr. H. M. 
Parshley of Bussey Institution, who has suggested some important 
changes in my keys. 
Key to the Subfamilies of Lygeide. 
A. All sutures between the ventral segments of the abdomen 
straight and reaching the lateral margins on each side. Head 
commonly without sete near the eyes. 
B. All of the abdominal spiracles situated dorsally. Entire 
posterior margin of the pronotum, or at least the margin 
before the scutellum, turned down convexly. Fore femora, 
compared to the succeeding pairs, not much swollen and 
rarely armed beneath with teeth or spines. 
C. Posterior margin of the pronotum between scutellum 
and lateral angles more or less distinctly depressed or 
impressed. Hemielytra, also usually the head, pro- 
notum and scutellum impunctate. The two interior 
veins of the membrane commonly joined together near 
base by a transverse vein............. Lygeine Stal. 
CC. Posterior margin of the pronotum between the 
scutellum and lateral angles not distinctly depressed or 
impressed. Hemielytra, head, pronotum and scutel- 
lum distinctly punctate. The two interior veins of the 
membrane not joined together near base by a cross 
UE he Ca A Sena ae ee ee Cymine Stal. 
BB. All of the abdominal spiracles not situated dorsally, at 
least those of the sixth placed on the venter. Posterior 
margin of the pronotum, at least before the scutellum, com- 
monly not turned down convexly. Fore femora, as com- 
pared with the succeeding pairs, more or less shortened and 
swollen, armed or unarmed. 
