296 Heterogyna and Fossorial Hymcnoptera. 



segments in the ? , and also of the 5th in the S ; those 

 of the 2nd and 4th sometimes uniting so as to form 

 transverse bands ; 6th segment in the $ , and 5th in 

 the ? black only at the apex, 6th segment black in the 2 , 

 7th piceous at the apex in the c? ; femora black, more or 

 less yellow towards the apex above in the 3' ; tibiae yellow, 

 more or less black beneath ; tarsi yellow, dusky towards 

 the apex. Head and thorax hairy, finely and rugosely 

 punctured ; antennae in the 3' with the 3rd and 4tli joints 

 somewhat swollen and widely produced at the apex into 

 a sort of rounded tooth, the 5th, 6th, and 7th joints very 

 slightly dentate at the apex ; antennae in the ? simple ; 

 clypeus carinated ; vertex with a narrow impressed line 

 running into the impression of the face above the 

 antennae ; mesothorax posteriorly, and scutellum, slightly 

 longitudinally striate among the punctures ; metathorax 

 clathrately rugose in front, transversely rugose towards 

 its apex, with a wide shallow, crenate, central impression ; 

 abdomen shining, finely punctured, apical segment in 

 the 2 very narrow and acuminate, deeply sulcate, its sides 

 densely covered with long testaceous bristly hairs ; tibiae 

 spined in the 2 , and more or less denticulate. 

 Length 10—12 mill. 



Hab. — Generally distributed. F. Smith says he has 

 several times reared the sexes from pieces of willow- 

 stumps. 



26. interru2)tus, DeGecr. Mem. ii. 2, 807, pi. xxv. fig. 

 10 — 15 = Lindenius, Shuck., Smith, &c. 



Somewhat like chvijsostoma, cephcdotcs, &c., in colora- 

 tion, but very distinct from all the species of the genus 

 in the sculpture of the thorax. The mesothorax is 

 transversely and rather deeply striate in front and at the 

 sides, longitudinally striate posteriorly ; the scutellum is 

 longitudinally striate, the metathorax longitudinally 

 rugose near the base, transversely so near the apex, with 

 a central impression, crenate near the base. The thorax 

 in the 2 has also two yellow spots on the collar ; the 

 tubercles, the scutellum, and a small spot on each side 

 of it also yellow ; antennae simple in both sexes. 



Length 12 — 15 mill. 



H(d>. — Not common. Darenth, Southgate, Eipley, 

 Bristol, Suffolk, &c. 



