148 ME. BOLD ON THE ACULEATE HYMENOPTEEA 



large flies, which it shows great sagacity in capturing. The flies 

 are attracted by patches of dung, and to these places the Mel- 

 linus resorts, moving about quietly, as if it had no evil intentions 

 whatever. It gradually nears one of its companions, makes a 

 sudden grab, secures it in its jaws, and immediately carries ofi" 

 its prey. Another plan, mentioned by Mr. F. Smith, I have 

 often seen adopted. The Wasp stretches itself upon the dung as 

 if dead, lying quite motionless until a fly comes within reach, 

 when it is quickly secured. This manoeuvre is, I believe, mostly 

 resorted to when the dung is dry, and less attractive to the flies, 

 who may then also be more upon their guard. 



2. M. sahulosus, Fab. Dahlb., Hym. Europ.. I., 230, 133; 

 Smith, "Monog.," 114, 2. 



Newcastle-on-Tyne, Mr. Hewitson. Smith's Monograph, 116. 



Family 7. CRABRONID^, Leach. 



Genus 1. TRYPOYLON, Latr. 



1. T. clavicerum, St. Farg. Dahlb., Hym., Europ., I., 279, 

 175; Smith, Monog., 118, 2. 



North Seaton, burrowing in woods. July. 



Genus 2. CRABRO, Fab. (In part). 



1. C. clavipes, Linn. Smith, Monog,, 122, 1 ; Rhopalum 



clavipes, Dahlb., Hym. Eur., I., 291, 178. 



Rare. Little Benton in July, burrowing in the tops of the fir 

 palings. 



2. C. tibialis, Fab. Smith, Monog. 123, 2 ; Rliopalmn tihiale, 



Dahlb., Hym. Eur., I., 288, 177. 



Very rarely at Gosforth. June. 



3. C. dimidiatiis, Fab. Dahlb., Hym., Europ., I., 345, 228 ; 



Smith, Monog., 127, 3. 

 A very abundant species in Durham, Northumberland, and 

 Cumberland. July. 



