NEMATUS MELANOCEPIIALUS. 165 



79. NEMATUS MELANOCKPEALUS. 

 PL XXIV, fig. 6, Saw. 



Tenthredo salicis, De Geer, Mem., ii, 259, 14, Tab. 37, f. 1221 



(nee L.). 

 Nematus melanocephalus, Htg., Blattw., 219, 52; Kalt., Pfl., 



558, 581 ; Cam., E. M. M., xii, 



128; Br. and Zad., Schr. Ges. 



Konig., xvi, pi. 5,f. 13 (lar.), 1. c., 



xxiv, 316 ; Cain., Fauna, 39 ; 



Andre, Species, i, 108; Cat., 22,* 



164. 



perspicillaris, Brischke, Beschr., 7, pi. 1, f. 3 (lar.) ; 



Kalt., Pfl., 558 ; Andre, Species, 

 i, 218; Cat., 21,* 146; VolL, 

 Tijd. Ent., xxiii, 10, pi. 3 (im. 

 lar.). 



salicis, Thome., Hym. Scand., i, 141, 70. 



betulce, VolL, Tijd. Ent., vii, 70, pi. 3. 



Reddish-yellowish, the head (with the exception of a spot between 

 the antennae, one behind them, one behind the eyes, the clypeus 

 and labrum, which are pale testaceous), a spot across the breast, 

 the mesonotum, and a stripe across the luteous scutellum, black. 

 Wings hyaline, the costa luteous, the stigma black. The apex of pos- 

 terior tibiae and the tarsi are black. 



The <$ has a large mark on the sternum and the back of the abdo- 

 men black ; the apical segment of the same has a large fovea and 

 is keeled in the centre according to Thomson, but Yollenhoven states 

 that the abdomen is entirely luteous. 



Length 3| 4 lines. 



Melanocephalus is very similar in some respects to N. 

 salicis ; the antennae, however, are shorter and thinner, 

 the head is black with the exception of the parts noted 

 in the description, but it is not so thick, nor are the 

 sutures so distinct, the scutellum is luteous with a 

 black streak across (but it may be also entirely black), 

 the abdomen is thinner, flatter, and not so much 

 inflated, its apex being also much narrower. 



I have noted the following aberrations : 



a. Scutellum entirely black. 



b. Antennae pale brown beneath. 



Larva. Head deep black, narrower than the second 



