NATURAL HISTORY SOCIETY OF GLASGOW. 209 



tliorax and abdomen ; the tliird and fourth joints are nearly, if 

 not quite equal in length ; and the third joint is slightly curved. 

 The head is very shining, slightly punctured, and black ; the 

 clypeus partly, and the labrum very dark testaceous — in some 

 specimens almost black. The thorax is black and shining : the 

 tegulae and the apical angles of the pronotum white testaceous ; 

 the cenchri large, dull-white. The head and thorax are covered 

 with a very short down ; the abdomen is deep black ; the apex 

 being almost mucronate and pilose ; the cerci long and pall testa- 

 ceous ; in some individuals the ventral surface of the abdomen is 

 testaceous in the middle, in others quite black. The feet are 

 pale testaceous ; the femora, except at the base and apex, and the 

 posterior tarsi, black ; the anterior tarsi are also a little fuscous. 

 The wings are hyaline ; the costa and stigma, white testaceous; 

 the latter having the apical half fuscous. The third sub-marginal 

 cell is square, or nearly so. 



The male differs from the female in having the antennae longer, 

 thicker, and more pilose, and they are also paler beneath. More- 

 over, it appears to have the coxae and trochanters black ; the 

 anal segment is testaceous. I have not noticed any varieties 

 beyond slight differences in the colour of the mouth and legs. 

 Length, IJ to 2 lines. 



Nematus femoraUs comes nearest to N. Vallisnieri, Htg., and 

 may be known from it by having the femora almost entirely black, 

 and by the somewhat longer and thinner antennae. Nematus 

 crassisjjinus, Thoms. ; and N. dolichurus, Thoms., are also closely 

 allied species ; but both may be known from femoraUs by their 

 totally white stigmas. 



Note. — Since writing the above I have again visited Eannoch 

 (17th July, 1875), and found the galls pretty commonly; but they 

 contained very few larvae. Many were tenanted by Tortrix larvae, 

 which fed upon the substance of the galls; and I likewise observed 

 in them the larva of a beetle (? Balaninua) ; I also bred a Pimpla 

 from the galls of femoraUs which Mr Binnie brought me from 

 Braemar. 



On the same willow bushes on which I found N. femoraUs, I got 

 another and very different gall, of a pale-green colour. It was of 

 about the size of a hazel nut, oval, or irregularly roundish in shape, 

 the walls very thin, and the space inside consequently rather large. 



