NEMATUS DORSATCJS. 151 



had somewhat darker coloured antennse. There is a form 

 named varius, Lep., by Brischke, which is regarded 

 by him (and formerly by Zaddach) as distinct from 

 pallescens ; it differs from it very slightly in the 

 coloration of the wing nervures, and in the colour 

 of the body being more diluted and uniform. Accord- 

 ing to Zaddach there is an essential distinction in 

 the form and length of the saw ; but the difference 

 (if any) seems to me to be exceedingly slight ; and the 

 larvae of the two forms are identical. In these cir- 

 cumstances I have not regarded these two forms as 

 distinct species. 



Mesoleius transfuga, Holmgr., is its parasite. 



Common. Kintail, Braemar, Clydesdale, Worcester. 



Continental distribution : Sweden, Germany. 



71. NEMATUS DOESATUS. 



Vol. I, PI. IV, fig. 11, Lar. ; Vol. II, PI. XXIII, fig. 



3, Saw. 



Nematus dorsatus, Cam., E. M. M., xii, 129 (1875). 



Reddish-yellow ; antennse slightly fuscous above ; base of abdomen 

 above black, the black extending to the middle, becoming narrower as 

 that is reached, and not continuous ; extreme apex of sheath black, the 

 sheath itself pale yellow. Antennae of nearly uniform thickness, a 

 little longer than the abdomen and half the thorax ; third joint shorter 

 than fourth. Head narrower than thorax; front faintly punctured; 

 sutures on vertex deep, wide, distinct; frontal area clearly denned; 

 below it, above the antennas, is a deep fovea much longer than 

 wide; front projecting between the antennse. Clypeus deeply incised ; 

 tips of mandibles piceous. Wings hyaline, nervures blackish, costa 

 and stigma luteous ; third costal cellule not much wider than long, 

 dilated at apex ; third transverse cubital nervure oblique ; second 

 cellule long, not much shorter than fourth. Abdomen considerably 

 longer than head and thorax together, becoming narrower towards the 

 apex ; cerci long. Legs stout ; posterior spurs not reaching to middle 

 of metatarsus. 



Length 3 lines. 



The vertex at the ocelli is faintly blackish, and there 

 is a black mark on the middle lobe of the mesonotum. 



The longish abdomen tapering distinctly towards 

 the apex, readily separates this species from the others 



