British Hyinenoptera. 



165 



(11) 12, 



(14) 13 

 (13) 14. 



(16) 15. 



(15) 16. 



(8) 17. 

 (19) 18. 



(18) 19. 



(29) 20. 

 (22) 21. 



Metathorax posteriorly not bright and shining 

 at the sides. 



Scutelhini not raised, entirely flavous, or with a 

 single flavous spot in the middle. 



Abdomen with lateral spots ; antennas dark . . nolidaginis. 



Abdomen with continuous bands ; antennae pale fucata. 



Scutellum more or less raised, with two reddish 

 or flavous spots ; or entirely immaculate. 



Markings of 2nd and following abdominal seg- 

 ments black and yellow, sharply defined. 



Head somewhat rostrate ; the portion in front of 

 the eyes, viewed sideways, much longer than 

 that behind them Q-fasciata. 



Head not rostrate ; viewed sideways, with its 

 anterior portion not longer than the posterior. 



Abdominal bands, with the exception of the 1st, 

 entire ; apex of the posterior tibia in the $ 

 armed outwardly with two thick curved spines succincta. 



One or more of the abdominal bands, besides the 

 1st, interrupted; posterior tibiae in the J at 

 the apex outwardly unarmed or with several 

 fine spines. 



(^ , antennae short, almost entirely black ; 2nd 

 and 3rd joints of fiagellum subequal ; scutellum 

 with two large conspicuous yellow spots; J , 

 antennffi dark ; posterior tibife unarmed . . jacobcea. 



$ , antenuse long, only dark above at the base ; 

 2nd joint of fiagellum not so long as 3rd ; spots 

 of scutellum small, if any ; $ , antennae pale ; 

 posterior tibiae armed outwardly with fine 

 spines. 



Tegulffi fiavous ; 3rd joint of the antenna3 in the 

 ^ , looked at from beneath, not half so long as 

 the 4th; 3rd joint of the antennae in the $ 

 much shorter than the 4th . . . . . . lineola. 



Tegulfe almost always ferruginous ; 3rd joint of 

 antennae in the ^ beneath more than half the 

 length of the 4th ; 3rd in the $ almost as long 

 as the 4th alternata. 



Markings of abdomen brown and yellow, or, 

 if black, then with the black margined with 

 brown. 



(J with the joints of the antennae tuberculated 

 beneath ; 5 with the tubercles of theprothorax 

 and two spots on the scutellum fiavous ; the 

 pubescence of the thorax bright fulvous-red Lathburiana. 



$ with the antennae simple ; J with the spots 

 on the scutellum not fiavous ; pubescence of 

 the thorax not bright fulvous-red. 



Mandibles acute at the apex. 



Markings of abdomen cream-coloured or nearly 

 white on a clear brownish red ground ; pos- 

 terior tibiae in both sexes with five long equal 

 spines, pale in the $ , black in the $ . . alboguttata 



