THE FAUNA OF SCOTLAND. 43 



broad, broadly rounded at the apex; cerci long, pale; the dorsum of the 

 abdomen is black, the extreme apex, sides, and belly are testaceous; saw 

 broad, the sheath black at apex, hairy, projecting. 



Length 2| lines. 



In its general coloration N. strongylogaster closely resembles leucotrochus; 

 but the antennae are longer in proportion to the length of the body; the 

 eyes are broadly surrounded with brown; the clypeus white; the stigma 

 and costa are of the same colour, the costa not being paler than the 

 stigma, as in Hartig's species; the 2d recurrent nervure is received much 

 farther from the 2d submarginal, while the abdomen is much shorter. It 

 is also not unlike, at a first glance, some of the darker forms of umbrinus, 

 but the abdomen is shorter, and not keeled, neither is it so sharply pointed 

 at the apex; the costa and stigma are paler, and the incision in the clypeus 

 is deeper and broader. 



I forwarded this insect to Prof. Zaddach, who returned it with the 

 remark, " Nahe an viminalis und Einersbergeusis." 



Seemingly rare. I have taken one specimen in Kilsyth Glen, and 

 another near Cannisburn. 



53. N. VESICATOR, Bremi. 



Not common. Very local. Imago in May. Larva in July. Food plant 

 — Salix laurina. 



Rannoch. 



Forms large, oval, bladder-like galls, with a spacious internal cavity. 

 Generally they are nearly of the same colour as the willow leaf, but 

 occasionally specimens more or less marked with red are met with. 



54. N. voLLENHovENi, Cam.* 



Common. Imago in May. Larva June to October. Forms smooth, 

 green (with rosy cheeks) pea-shaped galls on Salix purpurea. 



Banks of Clyde, Allander, Kelvin (upper reaches), and Cart, Bishopton, 

 Loch Lomond. 



Rannoch, Aberdeenshire. 



I sent specimens of this species to Prof. Zaddach, without remark, 

 beyond mentioning the form of the gall, asking if they were the species 

 known on the Continent as N. viminalis. He has kindly replied that 

 they differed much from typical specimens, and he could scarcely regard 

 them as viminalis. 



55. N. PEDUNCULI, Ht(J. (?) 



Common. Imago in June. Larva, in pale green hairy galls, on Salix 

 aurita, from July to September. 



* a 



Scottish NaturaHst," ii. 296. 



