Manchester Memoirs, Vol. xliii. (1899), No. 3- 97 



white ; the mandibles obscure testaceous ; the palpi black ; 

 the face shining, covered with short, black hair ; the 

 labrum obscure testaceous ; the front and vertex shining, 

 impunctate ; the front somewhat triangularly raised below 

 the ocelli ; the raised part being depressed in the middle. 

 The prothorax uniformly rufous ; below thickly covered 

 with long, white hair ; its top in the centre is raised ; 

 below it is a stout, oblique keel. Mesonotum shining, the 

 sides obscurely shagreened ; the middle lobe clearly 

 separated ; the scutellum thickly covered with short, white 

 hair. Median segment black, thickly covered with white 

 hair ; the central area is narrowed at the base and apex ; 

 there is a stout, transverse keel near the base, and another 

 shortly beyond the middle. The upper part of the 

 mesopleurse largely rufous ; the black lower part is 

 depressed obliquely, the top bearing a row of striations. 

 The metapleurse entirely black ; the oblique furrow at the 

 base is wide and deep ; the lower half is coarsely reticu- 

 lated. The wings are uniformly coloured, except for some 

 hyaline clouds at the base of the stigma in the cubital and 

 discoidal cellules. There are two distinct bullae in the 

 recurrent nervure near the top, the part between them 

 being elbowed ; the second transverse cubital nervure is 

 bullated below the middle ; the branch emitted by it 

 is as long as the nervure itself Abdomen deep black ; 

 the basal ventral segments pale testaceous ; the petiole 

 is longer than the second segment ; its basal two-thirds 

 are bordered laterally by two sharp keels, which 

 approach each other near the base, becoming wider 

 apart towards the apex, the space between being 

 hollowed ; its apex has two stout central, and two or 

 three shorter and more irregular longitudinal keels. The 

 second and third segments are stoutly longitudinally 

 striolated, the latter to near the apex, which is strongly 



