TENTHREDO OLIVACEA. 95 



shorter and of a slighter build. The part of the head 

 above the clypeus is black except two small green 

 marks above the antennas. 



From T. arctic a, Thorns, (which is not British), it 

 may be known by the completely green scutellum; 

 artica having also the posterior tarsi largely white 

 beneath, the pleura? black, and breast green behind. 



Obsoleta seems to be much rarer than mesomela, but 

 probably it will be confounded with that species. I 

 have only seen one or two specimens from Fossil 

 Marsh, near Glasgow. 



The only continental localities I have noted are 

 Lapland, Silesia, Gottengen, and Russia, if Eversrnann 

 be correct. 



Body olive-^reen, slightly marked with black above. Antennae 

 and legs lined with black on the upper side. Antennae long, 

 not thickened at apex. Eyes converging, not reaching to base 

 of mandibles. Clypeus deeply incised. Thorax smooth, 

 shining. (Species 19). 



19. TENTHREDO OLIVACEA. 



Tenthredo olivacea, King, Berl. Mag., viii, 193, 137 ; Htg., 

 Blattw., 309, 42 ; Thorns., Hym. Scand., i, 

 273,6; Cam., Fauna, 13, 14; Andre, 

 Species, i, 459 ; Cat., 58,* 45. 



Pale olive-green, antennae above, some lines on the vertex, sutures of 

 the mesonotum, a line in the centre of the front lobe of the same, and 

 at the sides in front of metanotum, one on the upper part of the legs 

 and the dorsum of abdomen black. Antennae as long as the abdomen, 

 thin ; apices of the mandibles brownish-black ; vertex slightly hairy ; 

 mesonotum finely punctured, and covered with a very short pile. Saw 

 large, projecting, extreme apex of sheath black. Wings hyaline, costa 

 and stigma greenish ; nervures black. The anterior tarsi only annu- 

 lated with black. $ and ? . 



Length 5 5 6 J lines. 



Ab. Dorsum of abdomen without any black. 



The black markings on the antenna, head, thorax, 

 and abdomen vary in intensity. 



Easily known from the other green species of 

 Tenthredo by the olive-green colour. From punctulata 

 and scalaris it may also be readily separated by the 



