1918] 
C. 
CC. 
D. 
DD. 
Barber—Synoptic Keys to the Lygeide (Hemiptera) 73 
Pronotum with the lateral margins of the anterior lobe 
obtuse, terete, neither calloused, carinate nor expanded 
nor longitudinally impressed within the lateral margin of 
the propleura; most commonly strongly constricted trans- 
versely to form two distinct lobes and most commonly 
provided with a constricted ring-like collar. [If collar is 
absent then is the head not at all or very lightly exserted 
(see Div. CC.). Body commonly less depressed, more 
NATEGOW ClONgALE. |... IAA US. eee. oe MyodochiniStal. 
Pronotum with the lateral margins of the anterior lobe not 
obtuse or terete but either calloused or carinate or ex- 
panded or the lateral emargination filled in by a foliaceous 
expansion or furnished within the lateral margin with a 
series of punctures or the propleura with a linear impression 
within the lateral margin. Pronotum rarely strongly con- 
stricted transversely, if so then is the lateral margin cari- 
nate or expanded or the lateral emargination filled in by a 
foliaceous expansion, or the propleura impressed within 
the lateral margin; rarely furnished with a constricted ring- 
like collar unless the head is strongly exserted or at most 
only provided with a depressed series of punctures within 
the anterior margin. Body most commonly broad with 
the head most commonly, almost or quite immersed to the 
eyes. 
Lateral margins of the pronotum not at all or less entirely 
laminate-expanded, most commonly either carinate or 
longitudinally impressed within the lateral margin of the 
propleura. Pronotum most commonly entirely black, 
ferrugineous or castaneous, with the posterior lobe rarely 
paler, punctuate with black. [Head rarely strongly 
exserted, if so, then is the constricted collar present 
anteriorly on the pronotum (Ozophora). Hind tibia 
most commonly without rigid bristles only, most fre- 
quently.’ ‘pilose: |) 2 lh Rhyparochromini Stal. 
Entire lateral margin of the pronotum and costa [more or 
less] laminate-expanded (in U. S. genera) and most com- 
monly in part pale; this margin rarely only keeled (in 
certain exotic genera), in which case the first segment of 
the antenna is extended far beyond the apex of the head 
