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 free dorsal joints depressed at base, this often with 1-4 fine, short 

 longitudinal carinae. Legs are more or less slender, all tibiae without 

 spines, the hindmost four tibiae in the o however occasionally with a 

 single short spine at tip on inner side (rig. 147), all tarsi 5- jointed, 

 either simple and narrow, or the third and fourth joint broad, cleft or 

 bilobedj hind tarsi are sometimes as long as, or only a little shorter 

 than the tibiae, but most often however considerably shorter than these, 

 their first joint longer than the second, longer than, or as long as the 

 claw- joint. 



In the c^ the abdominal sixth ventral joint always emarginate, or in- 

 cised at tip; the preceding joints simple or differently formed. 



The species live mostly on damp ground, a single one is steady guest 

 of Formica rufa . Of the 130 European species, about half of these are 

 found in this country. The larva of St. bipunctatus is known (Fig. 146, 

 accd. to J. Schijodte). 



Key to Subgenera and Species. 



1. Abdominal sides distinctly and most often rather thickly marginated; 



rarely (see Argus , f uscipes and pallipes) is this margin fine, 

 and then sometimes in O only distinct on the foremost joints. ..2. 

 Abdomen round, its sides not marginated; rarely (see crassus and 



nigritulus ) may the foremost joints bear a suggestion of a fine, 

 feeble side-margin 5. 



2. Tarsal fourth joint simple, entire, and not or scarcely broader than 



the, entire, third joint; rarely (see Argus , humilis and carbonarius ) 



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