3i6 HYMENOPTERA ACULEATA. 



C. elongata, Lep. {simplex, Nyl, conica, Kirh., inermis, 

 Kirb.). — Very like the other British species of the genus, 

 but differing from either of the two preceding in the 

 following particulars : — 



cJ with a distinct lateral tooth at the apex of the fifth 

 segment of the abdomen, sixth with the two upper apical 

 teeth blunt and divergent so that the two lower ones which 

 are spiniform and nearly parallel can be seen from above 

 lying between them, the pubescent bands of the segments, 

 narrowed towards the centre, and generally interrupted, 

 beneath largely punctured, fourth segment more finely and 

 closely than the third, entire at its apex, which has in its 

 centre a smooth corneous lobe, stipites of the armature 

 straight, clothed with long hairs at the apex, sagittfe very 

 wide, their apices remote, slightly longer than the stipites, 

 calcaria pale. 



? , closely resembling that of quadndentata the second 

 to the fifth abdominal segments with an apical fringe of 

 pale bail's widened at the sides, sixth dull, narrowly rounded 

 at the apex, fourth and fifth ventral segments very finely 

 punctured, the fifth narrowly emarginate at the apex, sixth 

 very long, constricted near the apex with a minute tooth 

 on each side just above the constriction, calcaria pale. 



L. 12 mm. 



Widely distributed and common in many places, but not 

 recorded from Scotland or Ireland, occurs from June to 

 August. F. Smith records it as being parasitic on Mega- 

 chile ligniseca, Willughhiella, and circmncincta. I have 

 taken it plentifully at Chobham together with the last 

 named species. Mr. C. W. Dale says, " I take it on the 

 roof of my house in company with Ostnia rufa on which 

 apparently it is parasitic, no Megachile with them." Mr. 

 Bignell records the occurrence of a cocoon or cell of this 

 species in a thistle head, it was in a sort of web and was 

 given to him as a Lepidopterous cocoon, but out of it he 

 bred a specimen of this species. 



