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



4. Membrane entirely black without pale margins or white discoidal or basal 



spots. Clavus anteriorly red. Head with a Y-shaped red fascia, the 

 anterior arms of which are extended beneath the antenniferous tu- 

 bercles ( = trimaculatus Dall.) turcicus Fab. 

 Membrane pale margined, with or without white discoidal spots. Clavus 

 either entirely black or anteriorly red. Red fascia at base of head most 

 commonly reduced in size .. 5. 



5. Clavus entirely black. Membrane variable, either only narrowly mar- 



gined with white and occasionally furnished with less conspicuous white 

 discal spots (Eastern forms) or broadly margined and furnished with 

 conspicuous white discal spots (Western forms) ... ...kalmii Stal. 



Clavus anteriorly red. Membrane narrowly margined and most com- 

 monly furnished with white discal spots which are often reduced and 

 sometimes wanting .... rec/ivatus Say. 



6. Pronotum entirely black or sometimes only humeral angles red. Odor- 



iferous orifices black. Head with red basal spot (sometimes obscured 

 in bis 'triangular -is). Corium and clavus bright red. Membrane 

 very narrowly and evenly white margined. Sixth and genital ventral 

 segments black... Subgenus Melanopleurus Stal 7. 

 Pronotum rarely entirely black (pyrrhopterus] , if so then as in the other 

 members of the subgenus Ochrostomus the odoriferous orifices are 

 pale. Commonly the anterior, lateral at least in part and most fre- 

 quently the posterior margin of the pronotum red or pale or the latter 

 trimaculate with red .. 8. 



7. Size larger, 8-9 mm. long. Bucculae variable but commonly higher and 



more semicircularly elevated. Bucculae, acetabulae, anterior margin 

 of propleurae and posterior margins of pro- and mesopleurae rather 

 broadly and conspicuously pale .. ...beljragei Stal. 



Size smaller, 5-6 mm. long. Bucculae lower, less semicircularly elevated. 

 Bucculae, acetabulae, margins of pleurae, inconspicuously, narrowly 

 pale bordered .. .bistriangularis Say. 



8. All margins of pronotum and hemielytra conspicuously bordered with red 



or yellow. Orifices black. Base of head with red spot. Bucculae, 

 acetabulae, anterior margin of propleura and posterior margins of all 

 pleurae broadly pale or yellow. Venter red with sixth and genital 

 segments black. (L. uhleri Stal.).. .. Subgenus Craspeduchiis Stal. 



Rarely with entire margins of pronotum and hemielytra bordered with 

 red or pale, if so then is the venter entirely black or margined with red 

 or the head is without a red spot at base.. 9. 



9. Head with a red or pale spot at base. Orifices pale. Coloration of venter 



variable, entirely black or margined with red or pale or only the sixth 

 and genital segments black ....Subgenus Ochrostomus Stal. 10. 



Head entirely black. Orifices black, rarely pale (mimulus) in which case 

 base of legs and apices of femora pale. Coloration of venter variable, 

 most frequently entirely black or narrowly red margined, rarely for the 

 most part red (bicrucis). Membrane with or without median white 

 discoidal spot 14. 



10. Venter red, sometimes more or less infuscated, sixth and genital segments 



