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 notum, more distinctly and densely punctated than this, their posterior 

 margin inside the outer corners distinctly incurved; ^icaomen from middle 

 and posteriorly slightly tapering, anteriorly very densely and very finely, 

 posteriorly somewhat less densely punctated, its filth free dorsal joint 

 much longer than the fourth. L. 2.5 mm. 



It is a true ant-guest, which permanently abides in the ant-hill, name- 

 ly with Formica rufa , rarely v<ith Formica fusca , is distributed in North 

 and r.iiddle Europe with these ants, but is not frequent here, and is rarely 

 encountered in any mound in such numbers as the following species. 



24. 0. haemorrhoa Mannh. 



(f.'annh. Brach. 76; Kraatz Ins. E. II, 184; Thorns. Skand. Col. Ill, 26; 

 lluls. et Fey Br^vip. 1874, 350; Janglb. Kaf. K. II, 74. - promiscua Erichs. 

 CJen. Spec. Staph. 148). 



Form and color of the bod/, combined with the puhctation of abdomen are 

 the most important identification characters. 



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Narrow, elongate and rather evenly broad, pitch-black or pitch-brown, 

 very finely haired, glistening; abdominal tip reddish or reddish-yellow; 

 elytra often, sometimes also pronotum and posterior margins of the fore- 

 most abdominal joints reddish-brown; antennal base, mouth-parts and legs 

 reddish-yellow. 



Head and pronotum are particularly finely and not densely punctated; 

 antennae rather short, and toward tip rather strongly thickened, their 

 third joint much shorter than the second, the next-last ones twice as broad 

 as long. Pronotum is posteriorly as broad as elytra, Ij limes as broad as 



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