Manchester Memoirs, Vol. xliii. (1899), ^0. 3. 19 



coxae and a longer one, enclosing the spiracles, over the 

 hinder pair, yellowish-white. The mesosternum is closely- 

 punctured, thickly covered with short, pale hair, and bears 

 two large, white marks on the apex. The front legs are 

 white, lined with black behind ; the four hinder legs bright 

 ferruginous, their coxse black in front, the middle troc- 

 hanters yellow. Wings almost uniformly violaceous, if 

 anything paler at the base. The base and apex of the 

 abdomen black, with a violaceous tinge, the middle 

 ferruginous. 



Tenthredo compressicornis, sp. nov. 



Nigra; capite thoraceque alboniaculatis ; antennis nigris, 

 ?nedio albis; pedibus pallide fulvis, basi coxarum nigro ; 

 alis violaceis. 



Long, to apex of first abdominal segment, 7 mm. 



Antennae black, the apical half of the fourth and the fifth 

 joints, except at the apex, white. Head shining, impunc- 

 tate ; the frontal area large, rounded at the top ; depressed, 

 raised in the middle; the vertex distinctly raised; a 

 narrow, but deep, furrow behind the ocelli; the face, 

 inner orbits narrowly, the outer, especially below, more 

 broadly; the sides of the clypeus at the base; the labrum 

 and the base of the mandibles, yellowish-white; the black 

 apex of the clypeus has a curved incision. Thorax black ; 

 the edge of the pronotum, broadly behind, more narrowly 

 at the base, the apex of the middle lobe of the mesonotum, 

 the sides of the lateral lobes on the inner sides opposite 

 it ; the scutellum, postscutellum, a large mark on the base 

 of the mesopleurae above, narrowed at the base below, a 

 smaller mark, pear-shaped, on the apex lower down, a small 

 mark on the base of the metapleurae above and a larger 

 one over the coxae, pale yellow. Mesonotum closely punc- 

 tured; the scutellum smooth, its apex covered with short, 



