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3. P. riparius Linn. 



(Linne Syst. Nat. Ed. X, 422; Erichs. Kaf. Mk. Br. I, 518; Gen. 

 Spec. Staph. 653; Kraatz Ins. D. II, 727; Thorns. Skand. Col. II, 196; 

 Uuls. et Rey Bre'vip. 1878, 258; Ganglb. Kaf. M. II, 537). 



Reddish-yellow, glistening; elytra and abdomen sparsely haired; 

 elytra blue; the head, with exception of the mouth, abdominal tip from 

 and encluding the fifth free joint, antennal outer part, tip of maxil- 

 lary palpi and femora, also the metasternum black or pitch-black; tarsi 

 partly brownish black. 



The head is as broad as pronotum, broader than in fusclpes, sparse- 

 ly punctated, at middle smooth; antennae slender and thin; pronotum oval, 

 anteriorly about as broad as elytra, narrowing posteriorly, on sides 

 with isolated punctation, otherwise smooth and polished; elytra a little 

 longer than pronotum, coarsely and rather densely punctated; abdomen 

 with fine and sparse punctation. L. 7-8 mm. 



In the Q the andominal sixth ventral joint is, like in the rest of 

 the species of this genus, at tip deeply incised. 



Distributed in Europe, and in this country it is numerous at brooks, 

 lakes and water-filled marshes. 



4. P. lltoralis Gravh. 



(Gravh. Micr. 61; Erichs. Kaf. Mk. Br. I, 519; Gen. Spec. Staph. 650; 

 Kraatz Ins. D. II, 726; Thorns. Skand. Col. II, 196; Muls. et Fey Brevip. 

 1878, 255; Ganglb. Kaf. M. II, 538). 



Much like riparius , but most often a little larger and distinctly 



of more robust build, recognized mainly by the form of pronotum and its 



finely marginated sides. 



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