NEMATUS BACCARUM. 197 



The galls are found early in June, and by the middle 

 or end of July all the larvae will have spun their cocoons, 

 which are larger than those of N. gallicola and darker in 

 colour. In confinement the larvas changed to greenish- 

 white pupae in March and emerged as perfect insects 

 about fourteen days after having changed. 



The larvae are attacked parasitically by a species of 

 Sciara, which emerges, either singly or in twos or 

 threes, from the cocoons in February. 



The only localities I know of for this species in 

 Britain are Rannoch, Braemar, and New Galloway. 

 It seems to be not uncommon although perhaps rather 

 local. 



99. NEMATUS BACCAHUM. 



Nematus baccarum, Cam., E. M. M., xi, 189 (1876) ; Fauna, 44, 

 58 ; Andre, Species, i, 160; Cat., 17,* 68. 



Antennae shorter than the body, comparatively thick ; black, obscure 

 brown at the tip ; the third and fourth joints about equal, the last 

 joint thinner and apparently longer than the eighth. Head black, 

 shining, the vertex finely punctured ; the labium and clypeus partly 

 white ; mandibles blackish ; pentagonal area well defined ; sutures on 

 vertex distinct ; antennal fovea large, deep, oval. Below and behind 

 the eyes the head is obscure testaceous. Thorax black, shining ; meso- 

 notum finely punctured ; the pronotum thinly edged with white ; tegulae 

 white. Abdomen obscure black, the anal segment above, and the 

 ventral surface more or less, pale testaceous ; the cerci white, projecting 

 outwardly. Sheath of the saw projecting, hairy. Legs white; the 

 coxa3 black at the base; the femora at base obscured with fuscous ; 

 posterior tarsi longer than the tibise and faintly fuscous ; spurs more 

 than one-third of the length of metatarsus. Wings hyaline ; costa and 

 stigma white, nervures pale ; the third cubital cellule is dilated at the 

 apex ; second recurrent nervure received about one-fourth of the length 

 of the second cubital cellule in front of the second transverse cubital 

 nervure. 



Length scarcely 1 lines. 



The pleurae and the greater part of the abdomen are 

 obscure black, passing on the ventral side into dull 

 brown ; this may, however, be owing to immaturity, 

 the insect having been killed before the colours had 

 become developed. 



