British Hymenoptera. 



239 



the species occurs there (also double-brooded), and that 

 he has always considered them identical ; vitrea is only 

 a narrower form of the autumn brood ; (for its affinities 

 with atriceps see notes on preceding species). 



Division III. 



(6) 1. (^ ; abdomen more or less red, or at least with the 



apical margins of the segments pale ; in one 

 species with the cheeks spinose or angulated at 

 the base of the mandibles ; mandibles simple ; 

 antennffi in some, reaching to the apex of the 

 metathorax. J ; abdomen more or less red 

 at the base, or with the apical valve simple, 

 not triangularly raised in the centre ; seg- 

 ments with paler hairs at the apex ; scopse dark 

 brown. 

 <y ; antennffi short, not reaching beyond the 



scutellum. J ; abdomen strongly punctured 

 (^ ; antennae reaching to the apex of meta- 

 thorax. 5 ; abdomen finely rugulose, not 

 strongly punctured. 

 (^ ; apical ventral valve entire ; cheeks simple. 

 2 ; dorsal valve not punctured . . 

 g' ; apical ventral valve deeply emarginate ; cheeks 

 angulated or spinose. J ; dorsal valve deeply 

 punctured 

 (1) 6. g ; abdomen without red or pale markings ; an- 

 tennae not reaching to the apex of the meta- 

 thorax ; cheeks simple ; mandibles often toothed 

 at the base. J ; abdomen without red markings, 

 shining, polished, or densely clothed with long 

 hairs, or, if with paler apical bands, then with 

 the apical dorsal valve triangularly raised in 

 the centre. 

 (12) 7. Species large ; abdomen blue-black or deep black, 

 polished and shining in both sexes ; mandibles 

 simple in g ; tarsi, at least the basal joint, 

 black ; scopffi of J black. 

 (9) 8. Abdomen blue-black 

 (8) 9. Abdomen deep black. 

 (11) 10. Face and under side with black hairs . . 

 (10) 11. Face and under side with white hairs 



(7) 12. Species large or medium-sized ; abdomen not 



polished and shining, except in some smaller 

 species ; mandibles often dentate in the g ; 

 scopffi of 2 black, brown, or fulvous. 

 (J with a narrow basal mandibular tooth, or with 

 the 3rd joint of the antenna as long as the 

 4th and 5th together. J ; abdomen densely 

 clothed with red or black haus. 



(16) 13. 



(15) 14. 

 (14) 15. 



(J ; mandibles toothed at the base. J ; abdomen 



clothed with fulvous-red hairs . . 

 g ; mandibles simple. J ; abdomen clothed 



with black hairs . . 



florea. 



Trimmerana. 



cineraria. 



thoracica. 

 nitida. 



fulva. 



Clurkella. 



