66 PROC. ENT. SOC. WASH., VOL. 23, NO. 3, MAR., 1921 



um and posterior margins of all pleurae conspicuously white or pale 



yellow... bicrucis Say. 



Posterior lobe of pronotum, corium, clavus and venter entirely or for 

 the most part fuscous .. ...17. 



17. Anterior lobe of pronotum and head between eyes and tylus ochraceous- 



red; posterior lobe bivittate with fuscous. Costal, apical, commissural 

 margins of hemielytra, apical carina of scutellum, lateral margins and 

 central disk of venter, pale yellow. Bucculae, antenniferous tubercles 

 beneath, acetabulae, prosternum for most part and posterior margins 

 of pleurae, pale yellow. Orifices, bases of legs and apices of femora 

 pale. Membrane scarcely pale marginal . ...mimulus Stal. 



Anterior and posterior lobe of pronotum concolorous fuscous; sometimes 

 the anterior or the posterior margin red or the latter trimaculate with 

 red; sometimes the lateral margins bordered with red. Orifices, legs 

 and venter black, the latter sometimes red or pale margined ... ...18. 



18. Membrane lacteous with prominent fuscous veins and spot near outer 



basal angle .. .. nigrinervis Stal. 



Membrane entirely fuscous or most frequently margined with white, 

 sometimes in lateralis provided with a sub-basal white spot... ...19. 



19. Corium entirely fuscous, never margined with red or yellow. Membrane 



scarcely pale margined. Anterior and humeral margins and sometimes 



posterior median fascia, red. Venter not red margined rubicollis Uhl. 



Corium with at least costal margins bordered with red or yellow. Pro- 

 notum with anterior, humeral or entire lateral margins and median 

 posterior fascia red or yellow ...20. 



20. Humeral red fascia not extended anteriorly beyond middle of pronotum. 



Anterior margin of prosternum, bucculae, and acetabulae very 

 obscurely pale. Apical carina of scutellum not red. Membrane 

 margined with white. Venter entirely fuscous or rarely margined 



with red ...21. 



Humeral red fascia extended beyond middle or entire edge of pronotum 

 reddish. Anterior margin of prosternum, bucculae and acetabulae 

 prominently and more broadly pale or yellow. Apical carina of 

 scutellum red. Membrane with or without white margin. Margin 

 of venter red .. ...22. 



21. Margins of venter rarely red. Costal margin only of hemielytra red. 



Sunken disk of pronotum on either side of post median ridge closely 

 and coarsely punctate. Larger species, about 8mm. Membrane 

 sometimes with a lunate white spot near base .. ...lateralis Ball. 



Margins of venter red. Costal, apical, commissural and inner claval 

 margins of hemielytra red, sometimes entire apical angle of corium red. 

 Disk of pronotum on either side of post median ridge finely or obscurely 

 punctate. Smaller species, 5 mm. ....admirabilis Uhl. 



22. Membrane very obscurely, narrowly white margined. Costal margins 



of hemielytra prominently and sometimes commissural and inner 

 claval margins very narrowly red or yellow. (= ? rubniger Stal.) 



facetus Say. 



