DOLERUS NIGER. 



Apparently not an uncommon species in June. 

 Rannoch, Lochaweside, Clydesdale, Dumfriesshire, 

 Norwich, Hastings (Butler), Glanvilles' Wootton. 



26. DOLERUS NIGER, 

 PI. XX, fig. 4, Saw. 



Tenthredo nigra, Linn., S. N., ed. xii, 925, 34 ; Fab., E. S., ii, 

 120, 64; S. P., 38, 44; Pz., F. G., lii, 

 fig. 11; Rossi, Mant., 237; Schr., 

 En., 336, 677; Vill., E. P., 44. 



Dolerus niger, Kl., Berl. Mag., viii, 301, 232 ; Lep., F. Fr., pi. 

 9, fig. 7; Mon., 125, 371; Ste., 111., 

 vii, 86, 3; Htg., Blattw., 237, 25; 

 Evers., Bull. Mosc., xx, 25, 14; Zad., 

 Beschr., 22; Thorns., Hym. Scand., 

 i, 289, 22; Cam., Fauna, 17, 8; 

 Andre, Species, i, 276, 54 ; Oat., 35*, 

 44. 



Black ; corered with a long greyish pile, except on the four or five basal 

 segments of the abdomen, which are glabrous above. Head a little 

 narrower than the mesothorax ; vertex not raised, with the sutures short, 

 deep ; vertex almost shining, punctured, but not very deeply ; the front 

 of the head opaque, and more deeply punctured than the vertex ; clypeus 

 deeply incised. Antennae nearly as long as the abdomen ; third joint 

 a little longer than the fourth, moderately thick ; apical joints much 

 thinner than the others. Thorax shining ; middle lobes of the meso- 

 notum strongly punctured ; the lateral lobes not so deeply at the sides ; 

 pleurae opaque, strongly punctured ; parapsides dilated. Cenchri dull 

 fuscous ; tegulae black. Abdomen longer than the head and thorax ; 

 the junction of the segments marked with a very thin white line ; the 

 ninth segment ending in a long hairy tuft. Sheath projecting, hairy at 

 the apex. Blotch distinct, much broader than long. Wings hyaline, 

 greyish fuscous at the apex ; the nervures, costa and stigma black. 



The <$ has the antennae longer than the abdomen, the third and 

 fourth joints equal, the greyish pile longer and thicker than in the ? ; 

 the abdomen long ; the apical lobes large ; the eighth segment smooth, 

 glabrous. 



Length 5f 6} lines. 



The largest of the black Doleri. Readily known by 

 fuscous cenchri and wings, which are smoky at the 

 apex and sometimes throughout. Commonly distri- 

 buted. I have bred a black Dolerus from the larva 

 figured on PI. YI, fig. 2, which seems to be niger, but 



