(Page 40) 

 three free dorsal joints feebly depressed at base, the fourth as lon^ as 

 the fifth; the le^s rather slender; ell tarsi 5-jointed; first joint of 

 hind tarsi shorter than the following two joints together, much shorter 

 than the claw-joint. 



The whole existence of the species seems closely connected with certain 

 ant species, and the life in their mounds. They are not found, or only 

 casually outside the mounds. Observations indicate that they here assist 

 in destroying animal offal, which constitutes their main nourishment. 

 The ants tolorate them, and rarely attack them, notwithstanding they run 



(Page 41) 

 about in the densest ant-crowd; when the ants move, the Thiasophjla wander 

 along with them. Their red- and blackish-brown color harmonizes well viith 

 that of the ant-hosts. 



In Middle and North Europe about 3 species are distributed, which are 

 much alike. They are also found in this country. 



Key to Species. 



1. Antonnal outer joints (6-10) feebly transverse, only li times as broad 



as long 2. 



Antennal outer joints (6-10) strongly transverse, twice as broad as 

 long. L. 2.5 mm 3. T. inguilina Mark, 



2. Antennal third Joint longer than the second, pronotum dull. L. :? mm. 



1. T. annulate Er. 



Antennal third joint only as long as the second; pronotum glistening. 

 L. P-P.5 mm 2. T. canaliculata Muls. 



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