274? MANDIBULATA. — HYMENOPTERA. 



tawny, remainder black, the base and apes of the 3rd and 4th occasionally 

 black, and sometimes a rounded spot of that colour on the back of all, com- 

 bined with black edges to the 3rd and 4.th; of the female broader, the basal 

 segment black, with its apex always, and sometimes the base, red, 2nd to 

 4th generally dull red, the last sometimes with an obsciu'e dorsal sjjot, 5th 

 red with the margin black, or black with the base and sides red, but rarely 

 wholly red ; 6th rarely with the sides red ; legs tawny, with the coxae and 

 trochanters black, 4 anterior femora tawny, with the base more or less black, 

 rarely entirely black or tawny; posterior femora black, with the tibiae 

 yellow or testaceous, the apex at times fuscous : in the female the legs are 

 rather of a darker hue, but in both sexes they vary in colour ; wings some- 

 what hyaline. 

 Not uncommon, in June and July, in various parts of the country ; 



it occurs within the metropolitan district, also in the New Forest, in 



Devonshire, Norfolk, Salop, near Dover, &c. 



Sp. 2. semiflava. Nigra, segmentis 2-4 tibiisquejlavis. (Long. corp. 7 — 8§ lin. j 

 Exp. Alar. $ 8—11 lin.) 



Al. semiflava. Steph. Nomen. 2d edit. Gen. 719. 2. 



Black : thorax with a faint yellowish dot at the base of the wings ; abdomen 

 with the 1st segment black at the base, yellow at the apex, 2nd to 4th bright 

 clear yellow, remainder black ; legs moderate, coxse and trochanters black, 

 4 anterior fuscous ; tibice and tarsi yellow, the base of the former more or 

 less black, especially of the 2nd pair; hinder femora black ; tibiae light yellow ; 

 tarsi fuscous ; wings hyaline ; cellule 5-angular. 



The basal angles of the 5th segment are sometimes yellow. 



Found in the vicinity of London in June : also near Bristol. 



Sp. 3. nigra. Nigra, sericea, femorihus anticis tibiisque fulvis. (Long. corp. 



6— 8 lin.; Exp, Alar. $ 11— 14 lin.) 

 Al. nigra. Gravenhorst, ii. 405. — Steph. Nomen. 2d edit. Gen. 719. 3. 

 Black, silky : legs with the coxae and trochanters black, anterior femora tawny, 

 sometimes black at the base, middle entirely tawny or totally black, or tawny 

 with the base black, posterior black; 4 anterior tibiae tawny, middle occa- 

 sionally a little dusky at the apex, posterior red or testaceous, with the base 

 and apex blackish or fuscous, with the opposite side rusty before the tip ; 

 tarsi tawny, anterior sometimes red, middle occasionally fuscescent, and 

 posterior at times fuscous ; wings smoky-hyaline, stigma tawny ; cellule 

 5-angular. Female unknown. 



Of this conspicuous insect the female appears to be unknown, 

 notwithstanding the species occurs throughout the country, and not 

 uncommonly : it is found in various places throughout the metropo- 

 litan district; also in the New Forest, in Devonshire, Salop, the 

 vicinity of Edinburgh, &c. in June and July. 



