322 HYMENOPTERA ACULEATA. 



tliicker than the femora, tarsi with the joints not dilated, 

 longer than wide. 



? very like that of maritima, but with the mandibles 

 more rugose, and less shining, the groove less strongly 

 marked, and shorter, the apical tooth less produced, but 

 more acute ; abdomen less closely and regularly punc- 

 tured, transverse impressions deep, the pale apical bands 

 less wide and dense, entire only on the fourth and fifth seg- 

 ments, scopa red, the hairs of the fifth and sixth segments 

 black ; anterior tibiee scarcely emarginate near the apex, 



L. 12-14 mm. 



Common, and generally distributed ; makes its burrows 

 in willow trees, and occurs from June to August. 



M. circumciucta, Lep. — Closely allied to the two 

 preceding, but easily distinguished by the following 

 characters : — 



In both sexes the pubescence is of a brighter brown, 

 and rather more abundant. 



The c? has the mandibles entirely black, except the 

 extreme piceous apex, and produced beneath into a 

 rather more prominent triangular basal tooth ; abdomen 

 clothed on the first three segments with long, pale, brown 

 hairs, on the apical segments with black, crest of the 

 sixth segment deeply emarginate, seventh with a strong 

 central tooth, sixth ventral segment with its apical wing 

 less produced at the lateral angles, armature with the 

 stipites straight, not bent outwards at the apices, the 

 sagittse suddenly convergent near the apex ; anterior coxal 

 spines without apical pencils of hairs, anterior femora pale 

 and concave in front, tibi^ paler at the apex, anterior 

 metatarsi less dilated, and less densely fringed than in 

 Willughbiella, parallel sided, second joint with a black spot 

 beneath, apical joint glabrous at the sides ; posterior meta- 

 tarsi shorter, and more parallel sided than in Willughbiella. 

 ? hairs of the face black, mandibles flat, shining, 

 largely punctured, groove very long and deep, pubescence 



