108 THE ENTOMOLOGIST. 



The head is short and broad, but slightly shining, the front 

 and face with man}^ folds and impressions, without hair. The eyes 

 are brown, oval, and moderately protuberant. The antennae are 

 inserted low down on the face : they are but little longer than 

 the thorax, and consist of nine joints, of which the third is the 

 longest, and the ninth the narrowest. The trophi are white, 

 except the base of the mandibles, which is grey ; the labrum is of 

 a paler white than the clypeus, which has a yellowish tint. The 

 maxillse and the broad posterior margin of the eyes are sordid 

 white. The thorax is shining, and covered with very short hairs ; 

 the upper border of the prothorax and the tegulae are white ; the 

 wings are transparent, iridescent, but a little clouded, the costa 

 and the stigma being white with a tinge of brown. In the second 

 submarginal cell is a horn}^ spot ; the anterior portion of the anal 

 cell {a7'c'a lanceolata) has a very oblique transverse nervure, the 

 under wings have no middle cell. In my example the sides of 

 the breast have on each side a small round white spot. 



The abdomen, which is rather broad and flat, has the posterior 

 margins of the segment very finely bordered with white, and, in 

 addition, on the 2nd, 3rd, 4th, and 5th segments, on either side 

 of the dorsum, bluish grey transverse bands interrupted in the 

 middle, which may, I think, consist of a covering of very short 

 fine hairs. The ovipositor protrudes but little. 



The legs are of the ordinary form, rather slender than robust. 

 The basis of the coxae and the larger part of the femora are 

 bronze-black; the apical half of the coxae, the trochanters, the 

 knees, the tibiae, except the apical half, which is brown, and the 

 basis of the tarsi are sordid white ; the remaining portion of the 

 tarsi is brown. The claws on the last joint are double. As I 

 mentioned above, my only example was a female. I find by 

 Thomson's description that in the male the marking of the head 

 and thorax is less distinct, and the last abdominal segment is 

 emarginate. 



It appears from the above that this species is scarce with us, 

 and especially so from the fact that it has not been enumerated 

 in the catalogue of our indigenous Hymenoptera. It is also 

 scarce in other places ; Hartig found it once on the willow, and 

 Thomson says rather scarce, adding, however, on hircJi, which I 

 cannot explain. 



Most probably this species has but one brood in the year. 



