1 90 (January, 



white ; tcgulsD white. Abdomen obscure block, the anal segment above, and the 

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

 sheaths of the saw projecting, hairy. Feet white ; coxse blact at base ; femora, at 

 base, obscured with fuscous ; posterior tarsi longer than the tibiee, and very faintly 

 fuscous. Wings hyaline ; costa and stigma white ; nervures pale ; 3rd sub-marginal 

 cellule dilated at apex ; 2nd recurrent nervure received about the length of a fourth 

 of the size of the 2nd sub-marginal cellule in front of the 2nd sub-marginal nervure. 



This species belongs to a veiy obscure group of saw-flies ; and if 

 I did not know its early stages, I would not have undertaken its 

 description. It comes nearest to the descriptions of -ZV". helicinus and 

 N. crassij^es, Thorns., from both of which its much smaller size, and 

 white legs and stigma, well serve to distinguish it ; and the 2nd 

 recurrent nervure being placed at some distance in front of the 2nd 

 Bub-marginal, affords another good mark of separation. 



I bred it from a berry-shaped gall of a greyish-green colour, 

 covei'ed closely with fine white hairs, which Dr. White sent me from 

 the neighbourhood of Dunkeld, where it was found by him on the 

 leaves of a willow — what species I do not know ; but the leaves were 

 not unlike those of SaJix aurifa. The larva was white, with the head 

 obscure fuscous ; eye-spots black ; mouth brown ; and the segments 

 projected considerably. Previous to pupation, I noticed that the end 

 of the body Avas rather sharply pointed ; the colour was dirty white. 

 They fed up to the end of October, when their cocoons were spun, 

 attached to the bottom of the breeding jar. They did not make a hole 

 for the expulsion of the frass, which is very fine and powdery. Neither 

 did they, previous to spinning, become of a slate colour — thus differing 

 from the larvae of helicinus. 



The pupa is white. The imago made its appearance on the 1st 

 May, about two weeks after becoming a pupa. 



Nematus ceassipes, Thoms., var. tacciniellus. Cam. 



? . Antenufc shorter than the body, black, stout, very slightly tapering towards 

 the apex ; 3rd and 4th joints equal. Head black, finely punctured on the vertex ; 

 sutures distinct ; mouth and eyes (especially behind) surrounded with pale testaceous ; 

 mandibles brown. Thorax black, shining ; tegulas white ; pronotum broadly edged 

 with white ; parapsides shining, in certain lights seen to be covered with a fine down ; 

 cenchri pale white. Abdomen black ; apex mucronate ; cerci moderately long, white ; 

 anal segment pilose ; above, and the last three segments at the sides, and underneath, 

 dirty testaceous. Feet whitish-testaceous, covered with whitish down ; posterior 

 tarsi shorter than the tibite ; last tarsal joints fuscous. Wings hyaline ; costa and 

 stigma white ; nervures pale fuscous ; the 2nd recmTent nervure nearly joined to the 

 2nd sub-marginal. The femora have a fuscous tinge in the mhldle. Length, 2 lines. 



The (J has the antennae longer than in the 9 , and also pilose ; the coxeb and 



