ENTOMOLOGICAL CABINET. 



THEREVA PLEBIA. Leach. Sam. Stephens. 

 Musca plebia. Linni. 



Ash coloured and very hairy : head large, as broad 

 as the thorax : eyes large, widely set in the female, 

 on the summit of the head are three stemmata, ar- 

 ranged in a triangle : antennae longer than the head, 

 the last joint ovoid-conic, with a distinct style ter- 

 minated by a seta : thorax a dark ash colour, with 

 lighter lines and very hairy : body dark ash colour, 

 with the margins of the rings lighter, gradually de- 

 creasing towards the apex : wings very irredescent 

 and with strong nervures : legs pale brown, with 

 long spines. 



Length of the body 5| lines, expansion of wings 

 8 lines. 



Inhabits the trunks of trees in woods and lanes 

 during the months of May, June and July. 



21-6 



