83 (82) Small, 2-2.1 nun long, 1 mm wide; slightly humped in 

 side view; brown to black; eastern (Fig. 77) : 



Optioservus aryophilus 

 Larger, at least 2.2 mm long; not noticeably humped 



in side view 84 



84 (83) 



Figs 76-82 Outline of adult pronotum and elytron: 



76- Heterti-mnius koebelei; 77- Optioservus aryophilus; 



78- 0, irrmunis; 79- 0. divergens; 80- 0. pecosensis; 



81- 0. trivittatus; 82- 0. sandersoni (all from Collier), 



Eastern; strial punctures on elytra deep; 2.2-2.4 mm 

 long, 1.2-1.3 mm wide; brown to black (Fig. 78): 



■Optioservus irmrunis 

 Western 85 



85 (84) Penis tapering gradually to a subacute apex; elytral 



striae lightly punctured; brown to black, with elytra 

 at times lighter than head and thorax; 2.2-2.5 mm 

 long, 1-1.1 nun wide (Fig. 79): Optioservus divergens 

 Penis more finger-shaped, tapering abruptly to a 

 rounded apex; strial punctures deeper; uniformly 

 shiny black; 2.4-2.6 mm long, 1-1.2 mm wide (Fig. 80): 



Optioservus peoosensis 



86 (82) Elytron with sutural vitta extending to apical third 87 



Elytron without sutural vitta 89 



87 (86) Elytron also with yellow vitta from humerus almost to 



apex (Fig. 81), 1.65-2.1 mm long, 0.9-1.1 nun wide: 



Optioservus trivittatus 

 Without humeral vitta 88 



88 (87) Sutural vitta narrow; humeral spot discrete; apical 



spot long and narrow, subvittate (Fig. 82); 2.6 mm 

 long, 1.3 mm wide: Optioservus sandersoni 



Sutural vitta broadened anteriorly and combined with 

 humeral spot, apical spot elongate (Fig. 83); 2.3 mm 

 long, 1.2 mm wide: Optioservus ozarkensis 



44 



