1918] Barber — Synoptic Keys to the Lygondoe (Hemiptera) . 73 



C. 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 



narrow elongate.] MyodochiniStkl. 



CC. 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. 

 D. 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.] Rhyparochromini St&l. 



DD. 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 



