152 THE GEOUP OF RUFIOAPILLUS. 



of the group. Its body lias more the shape of the 

 Ruficapillus group, and especially of N. acuminatus, 

 but the short ovipositor readily distinguishes it from 

 that species. The clypeus is deeper incised than in 

 N. cadderensis , &c. 



The larva has a longish cylindrical body ; the head 

 is brownish-red, mouth black ; eyes situated in a black 

 mark which extends to the vertex. Body to the 

 middle of the sides brownish-red obscured with black, 

 the black tint being deeper on the sides than on the 

 back; lower half of the sides and anal segment reddish- 

 brown. Skin smooth, shining, especially when full-fed; 

 legs reddish-white. It is a rather restless creature, 

 and feeds on birch in June and July, there being 

 probably two broods. 



Rare. Bishopton. 



XVII. THE GROUP OF RUFIOAPILLUS (LUTEUS). 



Colour reddish-yellow, the metanotum often, and more 

 rarely the mesonotum, marked with two or three longi- 

 tudinal black marks. Antennce luteous, more or less 

 marked with black above, usually shorter than thorax 

 and abdomen. Stigma testaceous, black at the base. 

 Third cubital cellule usually much longer than broad. 

 Clypeus incised. The last abdominal segment is very 

 large, occupying, on the lower side, the apical half of 

 the abdomen, the anterior segments being proportionally 

 reduced; it is also largely developed at the apex above, 

 where it, at the point, has a more or less vertical slope, 

 so that the cerci (which are of unusual length) project as 

 it were from the middle instead of, as usual, from the 

 top of the segment. The saw is very long and narrow ; 

 the apex bears generally six or seven sharply truncated 

 divisions, which project on both sides, and have waved 

 cross-bars. At the apex the divisions are waved, and 

 the cross-bars are finely toothed. The sheath is large 

 and broad compared to the breadth of the saiv. 



