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6. Pronotal impressions very flat, yet distinct. L. 2.5 mm 



5. 0. oxycanthae Sravh . 



Pronotal impressions at middle rather deep, oviform. L. 2 mm 



6. 0. exiguum jyllh. 



7. Pronotum with greatest breadth before middle, posteriorly feebly nar- 



rowing. L. 2.5-3.5 mm 7. 0. caesum iravh. 



Pronotum with greatest breadth behind middle, narrowing anteriorly. 



L. 3-3.5 mm 8. 0. excavatum Steph. 



1. 0. rivulare Payk. 



(Payk. Mon. Staph. 65; Erichs. Kaf. Ilk. Br. I, 629; Jen, Spec. Staph. 

 875; Kraatz Ins. D. II, 978; Thorns. Skand.. Col. Ill, 211; Bey Bre'vip. 1880, 

 202; Janglb. Kaf. M. II, 734. - incisum Jravh. Mon. 209). 



A rather broad, flatly convex species, with reddish-yellow antennal 

 base, identified inter alia by very densely punctated neck. 



Black, glistening; thorax naked, abdomen with especialy short, fine 

 and .sparse hair vestiture; pronotal side-margins and posterior margin 

 often reddish; elytra and abdominal tip brownish, sometimes light yellow- 

 ish-brown; first joint of antennae reddish-yellow, the three-four follow- 

 ing joints and the mouth most often brownish reddish-yellow; legs purely 

 reddish-yellow. 



The head (Fig. 183) is much narrower than pronotum, strongly neck- 

 formed constricted behind, with strongly oblique, very short temples, ■— 

 and with large, protruding eyes, rather robust and isolated, but the neck 

 with dense punctation, with two deep foveae on forehead before the ocelli, 

 and two flat longitudinal impressions toward the fore-margin, antennae 



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