108 



driver Hvepsen til at bygge en kunstig Rede. Det er derfor 

 først, naar vi kommer til Bierne, der ikke har stor Umage 

 behov for at skafl'e Foderet, der bestaar af Honning og 

 Blomsterstøv, at vi træffer de om et højtudviklet Bygge- 

 instinkt vidnende kunstfærdige Reder. 



Summary. 



Note on the life-history of Perisemus 

 fulvicornis Curt 



By 



J. C. Nielsen. 



Haliday^) has observed that this species like the 

 fossorial vi^asps has the habit of carying larvæ into hollow 

 stalks; since then hardly anything as far as I know, has 

 been published about its life-habits. The following details 

 are therefore perhaps of some interest as it must be con- 

 sidered somewhat unusual that a species of parasitic wasps 

 of the Proctotnjpidce is in prosession of instincts equal to 

 those of the fossorial wasps. 



I split a branch of a bramble- bush, in which was an 

 abandoned Pemphredon-hnrrow. A few inches from the 

 entrance a Tortrtx-\a.Y\?i was lying which a Perisemus tried 

 to carry further into the burrow, and at some distance, 

 still further in, another Tortrix-lRrxa. was found which had 

 almost been sucked out by three wasp-larvæ. 



The 7or^na;- larva lying next to the entrance was motion- 

 less and it is most probable that is was paralysed. There 

 are several features in the structure of the wasp which 

 indicate a paralysing power. 



^) Hal i day, Notes on the Bethyli (Perispmns fulvicornis Curt.) and 

 on Dryinus pedestris (Entoniol. Magaz. Vol. II, 1835, p. 219). 



