109 (108) 



110 (5) 



111 (110) 



112 (111) 



Margin of clypeus emarginate; pubescence of dorsum 

 thinner; eastern; 2.8-3.8 mm long, 1.5-2.1 mm wide: 



Lutroahus latioeps 



Margin of clypeus straight; dorsal pubescence dense 

 and yellowish; southwestern; 2.5-3.5 mm long, 1.5- 

 2.1 mm wide (Fig. 117): Lutroahus luteus 



Figs 117-118 Dorsal view of adult: 117- 

 tuteus; 118- Acneus quadrimaGulatus male, 



Lutroahus 



Posterior margin of pronotum crenulate or finely 

 beaded; males with at least the anterior claw on 

 each foot forked at apex (this requires high 

 magnification and the proper angle to observe) ; 

 adults not aquatic EUBRI INAE 



Posterior margin of pronotum smooth 



Ill 



114 



Prostemum narrow, depressed between coxae; antenna 

 with third joint at least as long as either the 

 first two or next three combined; male with 

 flabellate antennae (Fig. 118); female larger than 

 male and with serrate antennae; tarsal claws of 

 female not toothed at base Acneus 



Prostemum of moderate width, not depressed between 

 coxae; tarsal claws of both sexes with a basal 

 tooth; antenna of male not flabellate 



112 



113 



Elytron pale, with 7 blackish spots; mesosternal 

 process widely concave; male 3.5 mm long: 



Acneus oregonensis 



Elytron dark brown or black with 2 pale spots which 

 do not reach the elytral suture; these spots may be 

 joined by a pale marginal loop; sutural interval may 

 be lighter; 3.5-4.5 mm long, 2.1-2.8 mm wide (Fig. 

 118) : Acneus quadrimaaulatus 



51 



