442 HYMENOPTERA. 



yellow fascia on their apical margins, slightly attenuated in the 

 middle. 



Hob. Polish Ukraine. 



24. CERCERIS RUFIPES. B.M. 



Female. Length 6 lines. Black, strongly punctured : an 

 ovate spot above the clypeus, opposite to which, on each side of 

 the face, touching the orbit of the eyes, a larger spot, and a very 

 minute one at the base of the clypeus, yellow ; a minute yellow 

 spot behind the eyes. Thorax : a yellow spot on the tegulae in 

 front ; the wings fusco-hyaline ; the legs ferruginous, the poste- 

 rior tibiae and tarsi dashed with yellow. Abdomen: a small 

 yellow spot on each side of the first segment ; a narrow yellow 

 band on the second, third and fourth segments, very slightly in- 

 terrupted and narrowed in the middle, and a broader one on the 

 fifth, slightly narrowed in the middle ; beneath, immaculate. 



Hob. Polish Ukraine. 



25. CERCERIS CITRINELLA. B.M. 



Female. Length 4i lines. Pale yellow, thickly and strongly 

 punctured : a transverse black stripe between the eyes, enclosing 

 the ocelli, from which two narrower lines run downwards to the 

 insertion of the antennae; the tips of the mandibles rufo-piceous. 

 The prothorax black anteriorly ; the mesothorax with three lon- 

 gitudinal black stripes which unite with a transverse one at the 

 base ; a black spot behind the tegulae ; the wings hyaline, their 

 nervures pale ferruginous ; the posterior legs with ferruginous 

 stains. Abdomen : the apical and basal margins of the segments 

 narrowly and slightly ferruginous, the apical segment entirely 

 so ; beneath, the apical margins only ferruginous. 



Hab. Siberia. 



26. CERCERIS FLAVIVENTRIS. 



Cerceris flaviventris, Van d. Lind, Obs. ii. 107. 1. 

 Dahlb. Hym. Europ. i. 195. 117- 



Hab. Spain. 



27. CERCERIS CONCINNA. 



Cerceris concinna, Erulle, Hist. Nat. II. Canar. hi. 90. 48. 

 Hab. Canary Islands. 



28. CERCERIS SEMIRUFA. B.M. 

 Female. Length 5 lines. Black : the head not very strongly 



