British Hymenoptera. 241 



12. Bomhus Derhamellus, Kirb. (PI. XII., fig. 10). 



Kirb., Mon. Ap. Angl., ii., p. 263 ; Smith, Cat. Brit. 

 Hym., 2ncl ed., p. 205. 



Black, clothed with black pubescence ; the 4tli and following 

 segments of the abdomen clothed with red ; in the g' the thorax 

 is banded with ochreous-grey hairs anteriorly and posteriorly in 

 bright varieties, and the basal segments of the abdomen are also 

 clothed with hairs of the same colom- ; but in dark varieties the 

 band across the metathorax is wanting, and the base of the abdo- 

 men is black; posterior femora clothed with red hahs in both 

 sexes. 



(J . Head clothed with black hairs ; cheeks longer than their 

 apical width, shining, irregularly punctured. Antennas with the 

 2nd joint of the flagellum considerably longer than the 3rd, the 

 4th as long as the 2nd and 3rd together, the following joints sub- 

 arcuate. Thorax clothed with black hairs, with a band of paler 

 hairs in front, and also behind in bright varieties ; wings slightly 

 dusky. Abdomen with brownish grey hairs on the two basal seg- 

 ments, with black on the 3rd, and with red on the remainder, or 

 with the three basal segments entirely black ; beneath clothed with 

 reddish hairs ; genital armature with the squama produced at the 

 base inwardly into a long somewhat bent process ; the lacinia pro- 

 dixced at the base inwardly into a narrow spine, and sharply pointed 

 at the apex (see PI. XII., fig. 10). Legs clothed with reddish 

 hairs. 



2 and 5 . Entirely clothed with black hairs, with the exception 

 of the three aj)ical segments of the body, which are bright red. 

 Abdomen short and ahnost as wide as long; hairs of the posterior 

 tibiae red. Length, ^ and 5 15 — 18 mm., ^ 12 — 14 mm. 



Hab. Generally distributed, and abundant in some 

 localities. 



The ? much resembles that sex of lapidarivs, but the 

 short abdomen and red hairs of the posterior tibioB dis- 

 tinguish it at once. 



13. Bomhus sorocnsis, Fab. (PL XII., fig. 14). 



Fab., Gen. Ins., p. 246 ; Smith, Cat. Brit. Hym., 2nd 

 ed., p. 215= Cullumaniis, Kirby. 



This species is probably the most variable of all in 

 colour, and has led to great confusion on account of this 

 peculiarity, as in some varieties the whole insect is 



